SKF Food Line Y-bearing units. Offer the potential for a relubrication-free solution for most wet, abrasive and contaminating environments

Transcription

1 SKF Food Line Y-bearing units Offer the potential for a relubrication-free solution for most wet, abrasive and contaminating environments

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3 Contents SKF the knowledge engineering company... 4 A Product information SKF Food Line Y-bearing units... 7 Offer the potential for a relubrication-free solution for most wet, abrasive and contaminating environments... 7 SKF offers a solution, with a complete assortment of SKF Food Line Y-bearing units... 9 High-performance insert bearings... 9 Innovative and effective sealing system Chemical resistance End covers High-quality, NSF H1 registered grease SKF Food Line Y-bearing units not requiring relubrication No relubrication means reduced environmental impact Reduced grease consumption Housing materials Composite housings Stainless steel housings C Product data Designation systems Product tables Composite housings Stainless steel housings Y-bearings for metric shafts Y-bearings for inch shafts D Additional information SKF Food Line equivalent list, metric and inch shafts B Recommendations Mounting instructions General Tools Attaching SKF Food Line Y-bearing units to the support base Shaft tolerances Permissible speed Assembling units Mounting instructions for SKF Food Line Y-bearing units End covers

4 SKF the knowledge engineering company From one simple but inspired solution to a misalignment problem in a textile mill in Sweden, and fifteen employees in 1907, SKF has grown to become a global industrial knowledge leader. Over the years, we have built on our expertise in bearings, extending it to seals, mechatronics, services and lubrication systems. Our knowledge network includes employees, distributor partners, offices in more than 130 countries, and a growing number of SKF Solution Factory sites around the world. Research and development We have hands-on experience in over forty industries based on our employees knowledge of real life conditions. In addition, our world-leading experts and university partners pioneer advanced theoretical research and development in areas including tribology, condition monitoring, asset management and bearing life theory. Our ongoing commitment to research and devel opment helps us keep our customers at the forefront of their industries. Meeting the toughest challenges Our network of knowledge and experience, along with our understanding of how our core technologies can be combined, helps us create innovative solutions that meet the toughest of challenges. We work closely with our customers throughout the asset life cycle, helping them to profitably and responsibly grow their businesses. Working for a sustainable future Since 2005, SKF has worked to reduce the negative environmental impact from our operations and those of our suppliers. Our continuing technology development resulted in the introduction of the SKF BeyondZero portfolio of products and services which improve efficiency and reduce energy losses, as well as enable new technol ogies harnessing wind, solar and ocean power. This combined approach helps reduce the en viron mental impact both in our oper ations and our customers oper ations. SKF Solution Factory makes SKF knowledge and manu facturing expertise available locally to provide unique solutions and services to our customers. Working with SKF IT and logistics systems and application experts, SKF Authorized Distributors deliver a valuable mix of product and application knowledge to customers worldwide. 4

5 Our knowledge your success SKF Life Cycle Management is how we combine our technology platforms and advanced ser vices, and apply them at each stage of the asset life cycle, to help our customers to be more success ful, sustainable and profitable. Specification Maintain and repair Design and develop SKF Life Cycle Management Operate and monitor Manufacture and test Install and commission Working closely with you Our objective is to help our customers improve productivity, minimize main tenance, achieve higher energy and resource efficiency, and optimize designs for long service life and reliability. Innovative solutions Whether the application is linear or rotary or a combination, SKF engineers can work with you at each stage of the asset life cycle to improve machine performance by looking at the entire application. This approach doesn t just focus on individual components like bearings or seals. It looks at the whole application to see how each com po nent interacts with each other. Design optimization and verification SKF can work with you to optimize current or new designs with proprietary 3-D modell ing software that can also be used as a virtual test rig to confirm the integrity of the design. Bearings SKF is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and housings. Machinery maintenance Condition monitoring technologies and maintenance services from SKF can help minimize unplanned downtime, improve operational efficiency and reduce maintenance costs. Sealing solutions SKF offers standard seals and custom engineered sealing solutions to increase uptime, improve machine reliability, reduce friction and power losses, and extend lubricant life. Mechatronics SKF fly-by-wire systems for aircraft and drive-bywire systems for off-road, agricultural and forklift applications replace heavy, grease or oil consuming mechanical and hydraulic systems. Lubrication solutions From specialized lubricants to state-of-the-art lubrication systems and lubrication management ser vices, lubrication solutions from SKF can help to reduce lubrication related downtime and lubricant consumption. Actuation and motion control With a wide assortment of products from actuators and ball screws to profile rail guides SKF can work with you to solve your most pressing linear system challenges. 5

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7 SKF Food Line Y-bearing units A Offer the potential for a relubrication-free solution for most wet, abrasive and contaminating environments 1) From the acidity of citrus products to the abrasiveness of bakery goods, food and beverage equipment is adversely impacted by both the characteristics of the products being made, and the cleaning requirements of the manufacturing environment. To prevent bacterial growth, machinery is exposed to frequent high-pressure washdowns with caustic antibacterial cleansing agents, adding water and cleaning solutions to the list of contaminants that bearings are exposed to. Where sealing systems do not adequately seal, washdowns contaminate the bearing cavity and wash out the lubricant. To prevent corrosion and early failure, frequent relubrication is then necessary to purge the bearing of contamination and re-establish adequate lubrication. Environmental concerns related to lubricant and contaminants entering the waste stream then need to be addressed, adding to the total cost of operations. 1) Under normal operating conditions, SKF Food Line Y-bearing units do not need relubrication as the grease life typically exceeds the SKF rating life of the bearing. This, however, needs to be confirmed for each particular application. See page 12 for grease life for SKF Food Line Y-bearing units. 7

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9 SKF offers a solution, with a complete assortment of SKF Food Line Y-bearing units A Innovative SKF Food Line Y-bearing unit designs help to eliminate the washdown related problems of corrosion, premature bearing failure and environmental impact. Benefits include Increased productivity by eliminating relubrication downtime Improved foreign body prevention no dripping grease or purge contamination Reduced grease use and environmental impact Elimination of the risk that a missed relubrication point might cause a subsequent bearing failure Corrosion-resistant under virtually all washdown conditions Improved bacteria elimination due to solid or filled base design and smooth surface finish Wide dimensional range (plus availability in metric and inch sizes) A choice of bearing unit designs SKF Food Line Y-bearing units are available in a range of component designs. This enables the configuration of the bearing unit best suited for various applications and environments. The new SKF Food Line Y-bearing unit range includes: Corrosion-resistant insert bearings Food-grade grease High-performance seals Effective end covers Two different housing materials: Composite, strong, lightweight and chemically resistant with stainless steel lined mounting bolt holes and either a moulded in steel coil reinforced bore 1) or a massive design 2) Cast stainless steel for heavy-duty applications High-performance insert bearings Strong and corrosion-resistant At the heart of the SKF Food Line Y-bearing unit is a high-quality, corrosion-resistant insert bearing, with bearing rings and balls available in two executions: Stainless steel AISI grade 420, rings and balls Zinc coated high grade carbon chromium rings and high grade carbon chromium balls 1) Applies to plummer block housings SYWK..Y, four-bolt flanged housings FYWK..Y and two bolt flanged housings FYTWK..Y 2) Applies to housings SYWK..L, FYWK..L, FYTWK..L, SYFW..L, FYAWK..L, TUWK..L Both are equipped with the same high performance sealing system ( fig. 1, page 10). Designed for extended service life SKF Food Line Y-bearing units are designed to accommodate initial misalignment. The unit consists of a single row deep groove ball bearing with a sphered (convex) outside surface and a bearing housing, with a correspondingly sphered but concave bore. The design minimizes internal loads on the bearing that would exist if initial misalignment went uncorrected. The bearing inner ring is extended on both sides and is locked on the shaft with two stainless steel grub screws that are positioned at 120, minimizing inner ring distortion while maintaining good gripping strength. Extended service life is achieved as a result of the effective multiple seal system made of stainless steel and FDA approved synthetic rubber and filled with an NSF registered food-grade grease. 9

10 Innovative and effective sealing system Highly effective at resisting contamination and retaining lubricant All SKF Food Line Y-bearing units incorporate SKF s unique -2 RF multiple seals, that are highly effective at keeping detergent, water and other contaminants out of the bearing cavity and keeping lubricant inside. Multiple barrier protection provides long bearing service life The SKF multiple seal arrangement is proven to be highly effective during washdowns. It consists of a combination of a radial and an axial lip seal each protected by narrow gap seals ( fig. 1). SKF Food Line Y-bearing unit sealing system Fig. 1 1 A stainless steel flinger, press fitted to the bearing inner ring, adds mechanical and centrifugal protection against solid and liquid contaminants entering the bearing cavity. It forms a narrow gap seal to the bearing outer ring and has an FDA approved synthetic rubber seal lip vulcanized to it, that acts axially against the stainless steel insert that carries the radial seal lip. 2 The space between the axial and radial lip seals is filled with SKF GFJ food-grade grease to provide additional protection. 3 Lubricant retention and a further barrier to contamination is provided by the inner radial seal. A stainless steel insert, securely located in a groove in the bearing outer ring side face, forms a narrow gap seal to the bearing inner ring and carries an FDA approved synthetic rubber lip seal vulcanized to it, acting radially against the bearing inner ring. Food compatible materials Both the radial and axial lip seals are made of an FDA approved rubber compound. The space between the radial and axial lip seals and the flinger is filled with SKF food-grade NSF registered grease. SKF Food Line Y-bearing units, chemical resistance Chemical Example Concentration Temperature Time C min Chlorinated alkalies Acidified rinse Mild solution of caustic soda Post rinse, fresh water, acid solution max 0,5% ph 5,5 6,0 RT Strong alkalies Caustic soda 0,5 5% up to Strong acids Phosphoric acid, nitric acid ph ~ Table 1 Chemical resistance SKF Food Line Y-bearing units resist a wide range of chemicals and other treatments used during the washdown process ( table 1). Sanitizer Sodium hypochlorite 200 ppm active chlorine Hot water Steam <130 cold 2-3 minutes 10

11 End covers Secure fit, operator safety If needed to comply with health and safety regulations, SKF Food Line Y-bearing units can be supplied with effective polypropylene end covers. Two different cover designs are available: The ECW end cover comes with optional drain hole A ECW ( fig. 2) for SKF Food Line Y-bearing units with stainless steel housings and those with composite housings, identified by suffix Y. ECL ( fig. 3) for SKF Food Line Y-bearing units with composite housings, identified by the suffix L in the designations. The appropriate end cover for each SKF Food Line Y-bearing unit is listed in the product tables. Note that the end covers are not included with the Y-bearing units and must be ordered separately. The ECW cover has an optional drainage hole that can be easily opened by the user as required. Both ECW and ECL end covers are tested to withstand 100 bar pressure washdowns without dislocation. ECW cover Fig. 2 ECL cover Fig. 3 High-quality, NSF H1 registered grease Each SKF Food Line Y-bearing unit is prelubricated with SKF GFJ food-grade grease. This high quality grease is registered by NSF as a category H1 (lubricant acceptable with incidental food contact for use in and around food processing areas). The NSF registration confirms it fulfills the requirements listed in the US Food and Drug Administration's guidelines under 21 CFR section The technical specifications of this grease are listed in table 2, page 12. Extends bearing service life SKF GFJ food-grade grease is a highly effective bearing lubricant that offers advantages that help extend service life, including: Excellent corrosion protection High aging resistance 11

12 Grease life for SKF Food Line Y-bearing units Under normal operating conditions, SKF Food Line Y-bearing units do not need relubrication as the grease life typically exceeds the SKF rating life of the bearing.the grease life for SKF Food Line Y-bearing units can be estimated from Diagram 1 where the grease life is presented as L10, i.e. the time period at the end of which 90% of the bearings are still reliably lubricated. The estimated grease life, depending on the operating temperature and the speed factor, is valid under the following operating conditions: Horizontal shaft Very light to moderate loads (P 0,05 C) Stationary machine Low vibration levels If operating conditions differ, the estimated grease life obtained from the diagram must be adjusted: For vertical shafts, use 50% of the value from the diagram For heavier loads (P > 0,05 C), use the reduction factor listed in table 4, page 13 Vibration can have a negative influence on grease life. The extent cannot be quantified, and the influence increases with increasing operating temperature. For additional information, refer to the section Lubrication of the SKF catalogue Rolling bearings ( page 239), or contact the SKF application engineering service. Relubrication In the unusual event that estimated grease life is limiting, SKF Food Line Y-bearing units can be relubricated. Relubrication intervals can be estimated following the method explained in the section Lubrication of the SKF catalogue Rolling bearings ( page 239). When relubricating, the shaft should be rotating and grease should be pumped in slowly until fresh grease starts to escape from the seal(s). Excessive pressure from pumping too quickly can damage the seals. To relubricate the SKF Food Line Y-bearing unit, it is recommended to use the foodgrade grease SKF LGFP 2. As standard, composite housings for SKF Food Line Y-bearing units do not have a relubrication feature. If relubrication is required, then housings or units with relubrication feature (combination of designation suffixes N and /VZ1A2) should be specified ( page 21). Technical specifications of SKF greases for Food Line Y-bearing units Grease Temperature range 1) Thickener Base oil type GFJ C F Aluminiumcomplex soap 1) Refer to SKF catalogue Rolling bearings the SKF traffic life concept page 244 Estimated grease life for Food Line Y-bearing units where load P = 0,05 C Grease life L 10 [h] n d m = n = rotational speed [r/min] d m = mean diameter [mm] table 3 As standard, stainless steel housings for SKF Food Line Y-bearing units have a relubrication feature, plugged with a stainless steel set screw. If relubrication is required, the set screw can be removed and replaced by a suitable grease nipple with 1/4-28 UNF thread. Irrespective of housing material, if relubrication is to be employed, make sure a relubrication hole in the outside diameter of the insert bearing aligns with the drilling and groove in the housing bore. Synthetic hydrocarbon n d m = NLGI consistency class Table 2 Base oil viscosity [mm 2 /s] at 40 C at 100 C (105 F) (210 F) (105) (120) (140) (160) (175) (195) (210) (230) (250) Bearing mean diameter d m Bearing size 1) mm 04 33, , d m Diagram 1 Operating temperature [ C ( F)] Table 3 Bearing mean diameter d m 1) For example: bearing size 06 includes all bearings based on a Y 206 bearing, such as YAR 206-2RF/HV, YAR RF/HV, YAR RF/HV 12

13 Table 4 Reduction factor for estimated grease life, depending on the load Fig. 4 The traditional cycle of washdown and relubrication presents risks to both bearing service life and the environment A Load P 0,05 C 1 0,1 C 0,7 0,125 C 0,5 0,25 C 0,2 Reduction factor Washdowns Detergent creep Water ingress Corrosion Waste water contamination Washdown cycle SKF Food Line Y-bearing units not requiring relubrication No relubrication means reduced environmental impact Increased risk of foreign body ingress Relubricate to purge Frequent bearing replacements Less waste The cycle of washdowns and lubricant washout in food and beverage manufacturing creates a never-ending cycle of waste. It is common to relubricate bearings after each washdown daily, weekly or at other inter vals basedon production specifics. During this process, excess grease is dischargedpast the bearing seals (purged). At the next washdown cycle, the grease is washedaway andinto the plant s waste w a t e r. Because they can withstandfrequent washdowns without relubrication, SKF Food Line Y-bearing units can eliminate the need for relubrication, grease disposal and concern about environmental impact ( fig. 4). SKF Food Line Y-bearing units support Foreign Body Prevention Programs (AIB Gold Standard, GMP, HACCP) The volumes of grease used to relubricate 100 bearing positions for one year can be significant Fig. 5 Reduced grease consumption As an example, relubricating 100 bearing positions requires about ( fig. 5): 50 kg 15 g (0.53 oz.) of lubricant per bearing purge, which equals 1,5 kg (3.3 lbs.) per weekly maintenance cycle, or a total of 78 kg (172 lbs.) of lubricant per year 1 kg 0,5 kg 28 kg With the SKF Documented Solution Program, your SKF representative can show you how much you can reduce cost with SKF Food Line Y-bearing units, based on running data from your own plant. 15 g (0.53 oz.) Application of grease to 1 bearing 1,5 kg (3.3 lbs.) Application of grease to 100 bearings 78 kg (172 lbs.) Application of grease to 100 bearings weekly for one year 13

14 Housing materials Composite housings Strong, lightweight, chemical resistant Capable of resisting citric acids, cooking fats and most food and beverage processing chemicals, SKF Food Line composite housings are constructed of a thermoplastic composite material that is significantly lighter than cast iron housings. Other performance advantages include: Fracture strength Housings either incorporate steel coil reinforcement 1) or are of massive design 2). Radial breaking load is far greater than the static load rating of the bearing. The SKF Food Line Y-bearing unit is estimated to have the highest fracture strength of any composite unit on the market. Flush mounting A polyamide filled housing base or a solid base allow the unit to seat flush with its mounting surface. This surface-to-surface mounting eliminates gaps where contaminants could potentially collect. Stability Corrosion resistant, stainless steel attachment bolt hole liners provide added strength and stability. Housing designs SKF Food Line Y-bearing unit composite housings are available in the following designs: Plummer block Two- and four-bolt flange (oval or square) Short base Three-bolt bracket flange Take-up The SKF Food Line Y-bearing units with composite housings are offered with both stainless steel and zinc coated insert bearings. Please contact your local sales office for availability. Steel coils embedded in SKF composite housings 1) provide additional fracture strength 1) Applies to plummer block housings SYWK..Y, four-bolt flanged housings FYTWK..Y and two bolt flanged housings FYTWK..Y 2) Applies to housings SYWK..L, FYWK..L, FYTWK..L, SYFW..L, FYAWK..L, TUWK..L Choice of zinc coated or stainless steel insert bearing Unique -2RF multiple sealing system made of stainless steel and FDA approved synthetic rubber Insert bearing is prelubricated with NSF registered grease Light gray polyamide composite housing resists corrosion Polyamide cage No gaps where contaminants can collect Stainless steel attachment bolt hole liners 14

15 Stainless steel housings Extreme strength and toughness For extremely challenging food and beverage applications requiring maximum durability and chemical resistance, housings cast from AISI 300 series stainless steel may be the best answer. Strength SKF Food Line Y-bearing stainless steel housings are designed for applications where very heavy loads or shock loads are possible. Safety In applications where housing failure could result in injury, the safety factor inherent in cast stainless steel is an advantage. Chemical resistance Compared to composite housings, cast stainless steel offers a higher level of resistance to aggressive washdown chemicals. Stainless steel housings are not affected by strong concentrations of chlorine, hydrogen peroxide and many other chemicals. Surface finish Machined flat bases, the absence of any unnecessary crevices or pockets on the external surfaces and a smooth finish mean that SKF Food Line Y-bearing stainless steel housings are easy to clean with no recesses for debris and bacteria to accumulate or become trapped. Housing designs SKF Food Line Y-bearing unit stainless steel housings are available in the following designs: Plummer block Two- and four-bolt flange (oval or square) Short base The SKF Food Line Y-bearing units with stainless steel housings are offered with stainless steel insert bearings. Please contact your local sales office for availability. A 15

16 Mounting instructions General To provide proper bearing performance and prevent premature failure, skill and cleanliness are necessary when mounting SKF Food Line Y-bearings or Y-bearing units. As precision components, they should be handled carefully when mounting. It is also important to choose the appropriate method of mounting and to use the correct tools. The method used for mounting a SKF Food Line Y-bearing unit depends on the: Overall machine design Y-bearing housing design Method used to attach the unit to the shaft Attaching SKF Food Line Y-bearing units to the support base To reduce vibration and enable heat to dissipate from the unit, the housing must be firmly attached to the support base. To attach SKF Food Line Y-bearing units to the support surface, SKF recommends using 8.8 class bolts or studs and a washer to ISO 7089:2000 or 7090:2000 and a spring washer. Hexagonal head bolts in accordance with ISO 4014:1999 are appropriate. Alternatively, hexagonal socket head cap screws that comply with ISO 4762:1988 can be used ( fig. 1). Shaft tolerances The recommended fits for SKF Food Line Y- bearings are listed in table 1. For moderate loads (0,035 C < P 0,05 C), the shaft seats should be machined to an h7 tolerance. For light loads and low speeds, an h8 shaft tolerance is sufficient, and for very simple applications, h9 to h11 shaft tolerances may be used. Fig. 2 illustrates the relative position of the upper and lower limits of the most commonly used ISO shaft tolerance classes. The values of these ISO tolerances are listed in table 2 on page 17. NOTE: Failure to carefully follow applicable mounting instructions can result in premature bearing failure or improper performance. For further information, contact the SKF application engineering service. Detailed mounting instructions can be found on the following pages. SKF Food Line Y- bearings, Y-bearing housings or Y-bearing units should not be removed from their original packaging until immediately before they are mounted. Fig. 1 h6 h7 h8 h9h10h11 Fig. 2 Tools To mount or dismount SKF Food Line Y-bearing units, the following tools are required: A hexagonal key (hex wrench) to tighten or loosen grub (set) screws A spanner or hexagonal key to tighten or loosen the fasteners Recommended fits Operating conditions Tolerance class 1) P > 0,05 C and/or high speeds h C < P 0,05 C and/or low speeds h7 0,02 C < P 0,035 C and/or low speeds h8 Table 1 Simple bearing arrangement or P 0,02 C h9 h11 1) All ISO tolerance classes are valid with the envelope requirements (such as h7ve ) in accordance with ISO

17 Permissible speed SKF Food Line Y-bearings and SKF Food Line Y-bearing units should not operate at speeds above the limiting speeds listed in the product tables. Permissible speed is also influenced by the shaft diameter tolerance. When using these bearings on shafts with wider tolerances than h6, compare the speed values listed in the product tables with those listed in table 3. The lower value is the permissible speed. Assembling units In cases where SKF Food Line Y-bearings and Y-bearing housings are not supplied as a unit, the first step is to assemble the bearing into the housing. To do this, insert the Fig. 3 Fig. 4 bearing into the filling slot in the housing bore ( fig. 3) and with a round piece of wood or pipe, swivel the bearing into position. For composite housings (suffix Y), the locking device should face in the same direction as the filling slots ( fig. 4). For stainless steel housings and composite housings (suffix L), the locking device should face in the opposite direction to the filling slots. In any event, make sure that no relubrication hole or groove in the bearing outside diameter coincides with either of the filling slots in the housing, otherwise grease leakage may occur or contamination might enter the bearing ( fig. 5). If you need to assemble a unit type that is to be relubricated, make sure that the relubrication features in the outer ring of the bearing insert (hole or relubrication groove and hole) coincide with the relubrication facility (drilling and groove) in the housing bore ( fig. 5). B Fig. 5 ISO shaft deviations for SKF Food Line Y-bearings Shaft Shaft diameter deviations diameter h6ve h7ve h8ve h9ve h10ve h11ve d Deviation over incl. high low high low high low high low high low high low mm µm Table 2 Permissible speeds for SKF Food Line Y-bearings Bearing size 1) d r/min Table 3 Permissible speeds for shafts machined to tolerance class h7ve h8ve h9ve h11ve ) For example, bearing size 07 includes all bearings based on a Y207 bearings such as YAR 207-2RF/HV, YAR RF/HV, YAR RF/HV, YAR RF/HV. 17

18 Mounting instructions for SKF Food Line Y-bearing units 1 Remove any burrs on the shaft with emery cloth or a fine file, wipe clean with a cloth. Depending on loads and speeds, define the appropriate shaft tolerance from tables 1 and 2, pages 16 and 17 respectively, and check the shaft diameter. 2 Mount any components that are on the shaft between the two SKF Food Line Y-bearing units. 3 Make sure the housing base and mating surfaces are clean and free of any debris or burrs. Ensure the supporting surface is flat.the flatness should be within the IT7 tolerance grade and the roughness should be R a 12,5 µm. If the housing requires shims or adjustment, the shims must extend the full length and width of the base. 4 Slide the SKF Food Line Y-bearing unit onto the shaft with grub screws facing outwards. For pillow block units, fit the attachment bolts or nuts but do not tighten them. For flanged units, fasten them securely to the machine wall. 5 Mount the other SKF Food Line Y-bearing unit on the other end of the shaft. 6 Carefully align both SKF Food Line Y- bearing units using the shaft. For pillow block housings, fully tighten the attachment bolts or nuts for all units. For flanged housings, securely fasten the second unit to the machine wall. 7 Align the shaft in the bearing arrangement axially and if possible turn it a few times. 8 Tighten the grub screws in the inner rings of both units to the tightening torque indicated in table 4. 9 If applicable, snap the end cover(s) into place. End covers The product tables show the appropriate end cover for each bearing unit and the distance (A5) that the end cover protrudes from the housing side ( fig 6). Prior to starting the mounting procedure, make sure to use the correct end cover and check if the A5 dimension is suitable for your application arrangement. NOTE: the end cover must be ordered separately. Hexagonal keys to tighten grub screws in inner rings sizes and tightening torque Bearing Bearing or unit with metric bore Bearing or unit with inch bore size 1) N! WARNING! Rotating parts hazard. To avoid serious injury, do not mount or dismount end cover unless shaft has stopped rotating and the machine has been locked out or the shaft has been secured so it can t rotate. Table 4 A 5 Mounting instructions for end covers Fig. 6 1 Remove the end cover from its package. 2 Identify the end cover groove in the housing and make sure it is clean and free of any debris. 3 Hold the cover at an angle against the housing and insert the cover tabs into the housing groove. Note that in composite housings with suffix Y in the designation, the end cover groove does not cover the whole circumference, which is interrupted in the insert slot area. 4 Push the cover towards the housing until all the tabs snap into the housing groove. Where needed, help the tabs into position by bending the cover edge slightly as required. 5 Make sure the cover is securely in place. If needed, remove the end cap and start the process again from step 3. Dismounting instructions for end covers 1 Insert a screwdriver or a pointed tool into the space between the Y-bearing housing and the dismounting protrusion located in the cover side. 2 Unlock the cover by levering it until the first end cover tabs come out from the housing groove. Hold the cover to make sure that it does not fall down, and complete the unlocking process by hand. set screw size Hexagonal key size N Tightening torque set screw size Hexagonal key size N Tightening torque mm Nm inch Nm 04 M6 0, /4-28 UNF 1 / M6 0, /4-28 UNF 1 / M6 0, /4-28 UNF 1 / M6 0, /16-24 UNF 5 /32 6,5 08 M ,5 5/16-24 UNF 5 /32 6,5 10 M ,5 3/8-24 UNF 3 /16 16,5 1) For example, bearing size 07 includes all bearings based on a Y207 bearings such as YAR 207-2RF/HV, YAR RF/HV, YAR RF/HV, YAR RF/HV. 18

19 Designation systems The complete designation for a SKF Food Line Y-bearing or Y-bearing unit consists of: Prefixes, identifying the Y-bearing or Y-bearing unit series Figures, identifying the size Suffixes, identifying designs and variants More details about the basic designations and the supplementary designations can be obtained from the designation charts: SKF Food Line Y-bearing designation system ( table 1, page 20) SKF Food Line Y-bearing unit designation system ( table 2, page 21) C 19

20 Table 1 Designation system for SKF Food Line Y-bearings Examples YAR 204-2RF/HV YAR RFGR/HV YAR 204-2RFG/VE495 YAR RF/VE495 YAR RF/HV YAR RFGR/HV YAR RFG/VE495 YAR RF/VE495 Bearing series YAR Inner ring extended on both sides, with grub screws Dimensions Series 2 Bearing to ISO 9628:2006 Bore diameter Bearing for metric shafts mm bore diameter to mm bore diameter Bearings for inch shafts Three figure combination that follows the designation of the basic metric bearing and is separated from this by hyphen. The first figure is the number of whole inches and the second and third figures are the number of sixteenths of an inch e.g /4 in. = mm bore diameter to /1 6 in. = 49,213 mm bore diameter Suffixes Seals -2RF Multiple seal on both sides of bearing Material HV VE495 Stainless steel rings and balls, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease Zinc coated carbon steel inner and outer rings, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease Other features G Lubrication groove and one hole in the outside diameter of the outer ring, located on the side opposite the locking device (zinc coated bearings only, have an additional lubrication hole in the outside diameter of the outer ring, located on the same side as the locking device). GR Lubrication groove and one hole in the outside diameter of the outer ring, located on the same side as the locking device (stainless steel bearings only) 20

21 Table 2 Designation system for SKF Food Line Y-housings and Y-bearing units Examples SYWK 30 YTH FYTWK 25 NYTH/VZ1 A2 FYAWK 1.1/4 LTA SYFWR 40 YTHR TUWK 505 L SY W K 30 Y TH FYT W K 25 NY TH /VZ1A2 FYA W K 1.1/4 L TA SYF W R 40 Y THR TU W K 505 L Identification of housing shape SY Plummer block housing SYF Short base FY Square flange (4-bolt) FYT Oval flanged (2-bolt) FYA Three bolt flanged TU Take up C Identification of SKF Food Line W SKF Food Line Y-housing and Y-bearing unit Identification of housing material K Composite R Stainless steel Identification of size Bearing units for metric shafts: in millimeters uncoded mm bore diameter to mm bore diameter Bearing units for inch shafts: in inches uncoded 3/4 3 /4 in. = 19,050 mm bore diameter to 1 15/ /16 in. = 49,213 mm bore diameter Housings for both imetric and inch shafts 504 For Y-bearing sizes 204 to 510 for Y-bearing sizes 210 Additional housing features A Units of the next smaller size than normal (inch units only) L Suitable for ECL cover N (in combination with suffix VZ1A2 at the end of designation) SKF Food Line Y-bearing unit with composite housing with relubrication feature Y Suitable for ECW cover Z SYF short base units with inch thread Identification of inserted SKF Food Line Y-bearing TA SKF Food Line Y-bearing YAR series with grub screw locking, zinc coated carbon steel rings, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease, two lubrication holes in the outside diameter of the outer ring, one on each side, positioned 120 apart TAG SKF Food Line Y-bearing, YAR series with grub screw locking, zinc coated carbon steel rings, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease, lubrication groove and one hole in the outside diameter of the outer ring, located on the side opposite the locking device and one lubrication hole located on the same side as the locking device TH SKF Food Line Y-bearing, YAR series with grub screw locking, stainless steel rings and balls, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease, lubrication groove and one hole in the outside diameter of the outer ring, located on the side opposite the locking device THR SKF Food Line Y-bearing, YAR series with grub screw locking, stainless steel rings and balls, seals and flingers with stainless steel insert and FDA approved synthetic rubber and food-grade grease, lubrication groove and one hole in the outside diameter of the outer ring, located on the same side as the locking device 21

22 J N Composite SKF Food Line Y-bearing plummer block units stainless steel bearings, metric shafts d mm A 1 N 1 A 5 d s 1 B H G H 1 H 2 A SYWK.. Y.. J L ECW 2.. Dimensions Basic load ratings Fatigue Designation dynamic static load limit Bearing unit d A A 1 B H H 1 H 2 J L N N 1 G s 1 C C 0 P u mm kn kn , ,6 12, ,3 10,8 6,55 0,28 SYWK 20 YTH ,1 70,5 36, ,6 12, ,8 11,9 7,8 0,335 SYWK 25 YTH , , ,4 14, ,2 16,3 11,2 0,475 SYWK 30 YTH , , ,4 14, ,4 21,6 15,3 0,655 SYWK 35 YTH , , ,4 14, , ,8 SYWK 40 YTH , , ,6 29,6 23,2 0,98 SYWK 50 LTHR Composite SKF Food Line Y-bearing plummer block units zinc coated bearings, metric shafts d mm Dimensions Basic load ratings Fatigue Designation dynamic static load limit Bearing unit d A A 1 B H H 1 H 2 J L N N 1 G s 1 C C 0 P u mm kn kn , ,6 12, ,3 12,7 6,55 0,28 SYWK 20 YTA ,1 70,5 36, ,6 12, ,8 14 7,8 0,335 SYWK 25 YTA , , ,4 14, ,2 19,5 11,2 0,475 SYWK 30 YTA , , ,4 14, ,4 25,5 15,3 0,655 SYWK 35 YTA , , ,4 14, ,2 30,7 19 0,8 SYWK 40 YTA , , ,6 35,1 23,2 0,98 SYWK 50 LTA As standard SKF Food Line Y-bearing units composite housings are lubricated for life. SKF does not recommend relubricating. If required units with relubrication fittings are available upon order. Please contact SKF for further details regarding delivery time and appropriate designations. 22

23 J A 1 N 1 A 5 d s 1 B H G N H 1 H 2 A SYWK.. L.. J L ECL 2.. C Designations Limiting speed Mass Appropriate cover Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min kg mm h6 A 5 SYWK 20 YTH SYWK 504 Y YAR 204-2RF/HV ,24 ECW ,3 SYWK 25 YTH SYWK 505 Y YAR 205-2RF/HV ,29 ECW ,3 SYWK 30 YTH SYWK 506 Y YAR 206-2RF/HV ,49 ECW SYWK 35 YTH SYWK 507 Y YAR 207-2RF/HV ,66 ECW ,5 SYWK 40 YTH SYWK 508 Y YAR 208-2RF/HV ,86 ECW ,5 SYWK 50 LTHR SYWK 510 L YAR 210-2RFGR/HV ,3 ECL ,4 Designations Limiting speed Mass Appropriate cover Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min kg mm h6 A 5 SYWK 20 YTA SYWK 504 Y YAR 204-2RF/VE ,24 ECW ,3 SYWK 25 YTA SYWK 505 Y YAR 205-2RF/VE ,29 ECW ,3 SYWK 30 YTA SYWK 506 Y YAR 206-2RF/VE ,49 ECW SYWK 35 YTA SYWK 507 Y YAR 207-2RF/VE ,66 ECW ,5 SYWK 40 YTA SYWK 508 Y YAR 208-2RF/VE ,86 ECW ,5 SYWK 50 LTA SYWK 510 L YAR 210-2RF/VE ,3 ECL ,4 23

24 Composite SKF Food Line Y-bearing plummer block units stainless steel bearings, inch shafts d 3 / /16 in. 19,05 49,213 mm J A 1 N 1 A 5 N d s 1 B H G H 1 H 2 A SYWK.. Y.. J L ECW 2.. Dimensions Basic load ratings dynamic static d A A 1 B H H 1 H 2 J L N N 1 G s 1 C C 0 P u Fatigue load limit Designation Bearing unit in./mm lbf/kn lbf/kn 3 / / SYWK 3/4 YTH 19, , ,4 12, ,3 10,8 6,55 0, / SYWK 1. YTH 25, ,1 70,5 36, ,4 12, ,8 11,9 7,8 0, / / SYWK 1.3/16 YTH 30, , , ,4 14, ,2 16,3 11,2 0, / / SYWK 1.1/4 AYTH 31, , , ,4 14, ,2 16,3 11,2 0, / SYWK 1.1/4 YTH , , ,4 14, ,4 21,6 15,3 0, / / SYWK 1.3/8 YTH 34, , , ,4 14, ,4 21,6 15,3 0, / / SYWK 1.7/16 YTH 36, , , ,4 14, ,4 21,6 15,3 0, / / SYWK 1.1/2 YTH 38, , , ,4 14, , , / / SYWK 1.15/16 LTHR 49, , , ,6 29,6 23,2 0,98 As standard SKF Food Line Y-bearing units composite housings are lubricated for life. SKF does not recommend relubricating. If required, units with relubrication fittings are available upon order. Please contact SKF for further details regarding delivery time and appropriate designations. 24

25 J A 1 N 1 A 5 d s 1 B H G N H 1 H 2 A SYWK.. L.. J L ECL 2.. C Designations Limiting speed Mass Appropriate cover Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min lb/kg in./mm h6 A 5 SYWK 3/4 YTH SYWK 504 Y YAR RF/HV ECW ,24 26,3 SYWK 1. YTH SYWK 505 Y YAR RF/HV ECW ,28 26,3 SYWK 1.3/16 YTH SYWK 506 Y YAR RF/HV ECW ,28 31 SYWK 1.1/4 AYTH SYWK 506 Y YAR RF/HV ECW ,47 31 SYWK 1.1/4 YTH SYWK 507 Y YAR RF/HV ECW ,71 32,5 SYWK 1.3/8 YTH SYWK 507 Y YAR RF/HV ECW ,65 32,5 SYWK 1.7/16 YTH SYWK 507 Y YAR RF/HV ECW ,62 32,5 SYWK 1.1/2 YTH SYWK 508 Y YAR RF/HV ECW ,9 33,5 SYWK 1.15/16 LTHR SYWK 510 L YAR RFGR/HV ECL ,3 42,4 25

26 Composite SKF Food Line Y-bearing plummer block units zinc coated bearings, inch shafts d 3 / /16 in. 19,05 49,213 mm J A 1 N 1 A 5 N d s 1 B H G H 1 H 2 A SYWK.. Y.. J L ECW 2.. Dimensions Basic load ratings dynamic static d A A 1 B H H 1 H 2 J L N N 1 G s 1 C C 0 P u Fatigue load limit Designation Bearing unit in./mm lbf/kn lbf/kn 3 / / SYWK 3/4 YTA 19, , ,4 12, ,3 12,7 6,55 0,28 15 / / SYWK 15/16 YTA 23, ,1 70,5 36, ,4 12, ,8 14 7,8 0, / SYWK 1. YTA 25, ,1 70,5 36, ,4 12, ,8 14 7,8 0, / / SYWK 1.3/16 YTA 30, , , ,4 14, ,2 19,5 11,2 0, / / SYWK 1.1/4 AYTA 31, , , ,4 14, ,2 19,5 11,2 0, / SYWK 1.1/4 YTA , , ,4 14, ,4 25,5 15,3 0, / / SYWK 1. 3/8 YTA 34, , , ,4 14, ,4 25,5 15,3 0, / / SYWK 1. 7/16 YTA 36, , , ,4 14, ,4 25,5 15,3 0, / / SYWK 1.1/2 YTA 38, , , ,4 14, ,2 30,7 19 0, / / SYWK 1.15/16 LTA 49, , , ,6 35,1 23,2 0,98 As standard SKF Food Line Y-bearing units composite housings are lubricated for life. SKF does not recommend relubricating. If required units with relubrication fittings are available upon order. Please contact SKF for further details regarding delivery time and appropriate designations. 26

27 J A 1 N 1 A 5 d s 1 B H G N H 1 H 2 A SYWK.. L.. J L ECL 2.. C Designations Limiting speed Mass Appropriate cover Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min lb/kg in./mm h6 A 5 SYWK 3/4 YTA SYWK 504 Y YAR RF/VE ECW ,24 26,3 SYWK 15/16 YTA SYWK 505 Y YAR RF/VE ECW ,28 26,3 SYWK 1. YTA SYWK 505 Y YAR RF/VE ECW ,28 26,3 SYWK 1.3/16 YTA SYWK 506 Y YAR RF/VE ECW ,28 31 SYWK 1.1/4 AYTA SYWK 506 Y YAR RF/VE ECW ,47 31 SYWK 1.1/4 YTA SYWK 507 Y YAR RF/VE ECW ,71 32 SYWK 1. 3/8 YTA SYWK 507 Y YAR RF/VE ECW ,65 32,5 SYWK 1. 7/16 YTA SYWK 507 Y YAR RF/VE ECW ,62 32,5 SYWK 1.1/2 YTA SYWK 508 Y YAR RF/VE ECW ,9 33,5 SYWK 1.15/16 LTA SYWK 510 L YAR RF/VE ,86 ECL 210 1,67 1,3 42,4 27

28 Composite SKF Food Line Y-bearing short base plummer block units stainless steel bearings, metric shafts d mm A 1 d s 1 B H H 1 G 1 A G J L Dimensions Basic load ratings Fatigue Designation dynamic static load limit Bearing unit d A A 1 B H H 1 J L G G 1 s 1 C C 0 P u mm kn kn 20 34,5 23, ,3 50,8 72,8 M ,3 10,8 6,55 0,28 SYFWK 20 LTHR 25 39,5 25,4 34,1 73,5 36,5 50,8 76,2 M ,8 11,9 7,8 0,335 SYFWK 25 LTHR 30 42, , ,9 76,2 101 M ,2 16,3 11,2 0,475 SYFWK 30 LTHR 35 47,5 32,5 42, ,6 82,6 110 M ,4 21,6 15,3 0,655 SYFWK 35 LTHR ,2 100,5 49,2 88,9 120 M , ,8 SYFWK 40 LTHR ,5 51, ,2 101,6 135 M 16 23,5 32,6 29,6 23,2 0,98 SYFWK 50 LTHR Composite SKF Food Line Y-bearing short base plummer block units zinc coated bearings, metric shafts d mm Dimensions Basic load ratings Fatigue Designation dynamic static load limit Bearing unit d A A 1 B H H 1 J L G G 1 s 1 C C 0 P u mm kn kn 20 34,5 23, ,3 50,8 72,8 M ,3 12,7 6,55 0,28 SYFWK 20 LTA 25 39,5 25,4 34,1 73,5 36,5 50,8 76,2 M ,8 14 7,8 0,335 SYFWK 25 LTA 30 42, , ,9 76,2 101 M ,2 19,5 11,2 0,475 SYFWK 30 LTA 35 47,5 32,5 42, ,6 82,6 110 M ,4 25,5 15,3 0,655 SYFWK 35 LTA ,2 100,5 49,2 88,9 120 M ,2 30,7 19 0,8 SYFWK 40 LTA ,5 51, ,2 101,6 135 M 16 33,5 32,6 35,1 23,2 0,98 SYFWK 50 LTA As standard SKF Food Line Y-bearing units composite housings are lubricated for life. SKF does not recommend relubricating. If required units with relubrication fittings are available upon order. Please contact SKF for further details regarding delivery time and appropriate designations. 28

29 A 5 C Designations Limiting speed Mass Appropriate covers Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min kg mm h6 A 5 SYFWK 20 LTHR SYFWK 504 L YAR 204-2RFGR/HV ,26 ECL ,3 SYFWK 25 LTHR SYFWK 505 L YAR 205-2RFGR/HV ,33 ECL SYFWK 30 LTHR SYFWK 506 L YAR 206-2RFGR/HV ,5 ECL SYFWK 35 LTHR SYFWK 507 L YAR 207-2RFGR/HV ,69 ECL ,8 SYFWK 40 LTHR SYFWK 508 L YAR 208-2RFGR/HV ,86 ECL ,5 SYFWK 50 LTHR SYFWK 510 L YAR 210-2RFGR/HV ,25 ECL ,4 Designations Limiting speed Mass Appropriate covers Bearing unit Separate components with shaft Bearing unit Designation Dimension Housing Bearing tolerance r/min kg mm h6 A 5 SYFWK 20 LTA SYFWK 504 L YAR 204-2RF/VE ,26 ECL ,3 SYFWK 25 LTA SYFWK 505 L YAR 205-2RF/VE ,33 ECL SYFWK 30 LTA SYFWK 506 L YAR 206-2RF/VE ,5 ECL SYFWK 35 LTA SYFWK 507 L YAR 207-2RF/VE ,69 ECL ,8 SYFWK 40 LTA SYFWK 508 L YAR 208-2RF/VE ,86 ECL ,5 SYFWK 50 LTA SYFWK 510 L YAR 210-2RF/VE ,25 ECL ,4 29

30 Composite SKF Food Line Y-bearing short base plummer block units stainless steel bearings, inch shafts d 3 / /16 in. 19,05 49,213 mm A 1 d s 1 B H H 1 G 1 A G J L Dimensions Basic load ratings Fatigue dynamic static load limit d A A 1 B H H 1 J L G G 1 s 1 C C 0 P u Designation Bearing unit in./mm lbf/kn lbf/kn 3 / M SYFWK 3/4 LTHR 19,05 34,5 23, ,3 50,8 72,8 M ,3 10,8 6,55 0, M SYFWK 1. LTHR 25,4 39,5 25,4 34,1 73,5 36,5 50,8 76,2 M ,8 11,9 7,8 0, / M SYFWK 1.3/16 LTHR 30,163 42, , ,9 76,2 101 M ,2 16,3 11,2 0, / M SYFWK 1.1/4 ALTHR 31,75 42, , ,9 76,2 101 M ,2 16,3 11,2 0, M SYFWK 1.1/4 LTHR 47,5 32,5 42, ,6 82,6 110 M ,4 21,6 15,3 0, / M SYFWK 1.3/8 LTHR 34,925 47,5 32,5 42, ,6 82,6 110 M ,4 21,6 15,3 0, / M SYFWK 1.7/16 LTHR 36,513 47,5 32,5 42, ,6 82,6 110 M ,4 21,6 15,3 0, / M SYFWK 1.1/2 LTHR 38, ,2 100,5 49,2 88,9 120 M , , / M SYFWK 1.15/16 LTHR 49, , ,2 101,6 135 M 16 23,5 32,6 29,6 23,2 0,98 As standard SKF Food Line Y-bearing units composite housings are lubricated for life. SKF does not recommend relubricating. If required units with relubrication fittings are available upon order. Please contact SKF for further details regarding delivery time and appropriate designations. 30