DEFENSE LOGISTICS AGENCY LAND AND MARITIME P.O. BOX 3990 COLUMBUS, OH

Transcription

1 DEFENSE LOGISTICS AGENCY LAND AND MARITIME P.O. BOX 3990 COLUMBUS, OH March 27, 2017 MEMORANDUM FOR MILITARY/INDUSTRY DISTRIBUTION SUBJECT: Initial drafts of MIL-DTL-38999/51B with Amendment 1, Connector, Electrical, Circular, Cover, Protective, Plug, MIL-DTL-38999, Series IV, and MIL-DTL-38999/52B with Amendment 1, Connector, Electrical, Circular, Cover, Protective, Receptacle, Series IV, Project Numbers and The drafts for the subject documents, dated March 29, 2017, are now available for viewing and downloading from the DLA Land and Maritime-VA website at the following internet address: Both documents include the following proposal: Under Requirements, for the insulated, stainless steel rope material, add the words Passivation or proof of passive finish using test method ASTM A967 or equivalent is permissible. Rationale: ASTM A967, Practice D, provides a test method to verify the passivity of a finish with a copper sulfate solution. The wording proof of passive finish is intended to allow the rope to be manufactured without performing a separate passivation process involving immersion in passivation solution. This separate process may inadvertently allow the acid passivation solution to wick between the rope strands and under the insulation, possibly resulting in the development of corrosion. In addition, editorial changes to both documents are included to harmonize with MIL-DTL These changes include removing classes X and P from the list of codes for the cover material, which are no longer included in the basic spec. Also, the Change effectivity and the Disposition of stock paragraphs included in MIL-DTL-38999/51 have been deleted, since there are no changes in these documents that are unique to the protective covers. The change and disposition paragraphs in MIL-DTL apply. For MIL-DTL-38999/52 only, to harmonize with the G dia of the mating receptacles specified under MIL-DTL-38999/44 (environmental classes) propose new K dia max, Ldia min and M dimensions (ring external diameter, internal diameter, and length from center axis of ring to center axis of fastener). Proposed additions to the documents are indicated in the draft with bold lettering and /or yellow highlighting. Proposed deletions are indicated with cross-outs and /or green highlighting. If these documents are of interest to you, please provide your comments or suggested changes. Concurrence or comments are required at this Center within 45 calendar days from the date of this letter (no later than 12 May 2017). Late comments will be held for the next coordination of these documents. Comments from military departments must be identified as either "Essential" or "Suggested".

2 SUBJECT: Initial drafts of MIL-DTL-38999/51B with Amendment 1, Connector, Electrical, Circular, Cover, Protective, Plug, MIL-DTL-38999, Series IV, and MIL-DTL-38999/52B with Amendment 1, Connector, Electrical, Circular, Cover, Protective, Receptacle, Series IV, Project Numbers and Continued. Essential comments must be justified with supporting data. Military review activities should forward comments to their military department s document custodian in sufficient time to allow for consolidation of the department s reply. Lack of a response by the above due date will be interpreted as either concurrence with or no interest in these documents. Subsequent coordination for these documents will be circulated only to those interested parties that have responded to the subject initial drafts. The point of contact for these documents is Mrs. Lisa Hoffer, phone number , DSN , facsimile transmission , or lisa.hoffer@dla.mil. Comments may also be mailed via the US Postal Service to DLA Land and Maritime VAI (ATTN: Lisa Hoffer), P.O. Box 3990, Columbus, OH Sincerely, / SIGNED / ABDONASSER M. ABDOUNI Chief, Interconnection Branch cc: DLA Land and Maritime-FMTD (D. Barman) DLA Land and Maritime -VQP (A. Baillieul) DSCC.Standardization@dla.mil

3 Note: This draft, dated 29 March 2017 and prepared by DLA Land and Maritime-VAI, has not been approved and is subject to modification. DO NOT USE PRIOR TO APPROVAL. (Project ). METRIC MIL-DTL-38999/51B DRAFT SUPERSEDING MIL-DTL-38999/51B 14 June 2013 DETAIL SPECIFICATION SHEET CONNECTOR, ELECTRICAL, CIRCULAR, COVER, PROTECTIVE, PLUG, MIL-DTL SERIES IV This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL STYLE R (ROPE ONLY) FIGURE 1. Protective cover, plug, all classes. AMSC N/A FSC 5935

4 mm Inches mm Inches FIGURE 1. Protective cover, plug, all classes - Continued. 2

5 Dimensions Shell size A max dia B max dia C dia D dia E dia F H J min U max (1.380) (1.570) (.793) (.919) (.509) (.503) (.634) (.628) (.590) (.586) (.721) (.717) (.640) (.636) (.761) (.757) (.675) (.669) (.276) (.423) (.065) (.537) (1.660) (1.044) (.759) (.753) (.845) (.841) (.885) (.881) (.662) (.085) (1.790) (1.170) (.885) (.879) (.970) (.966) (1.010) (1.006) (.787) (1.920) (2.060) (1.294) (1.419) (1.009) (1.003) (1.134) (1.128) (1.095) (1.093) (1.220) (1.200) (1.089) (1.085) (1.214) (1.210) (.665) (.659) (.266) (.876) (.105) (1.001) (2.250) (1.544) (1.259) (1.253) (1.350) (1.330) (1.343) (1.339) (1.126) (.125) (2.380) (1.669) (1.384) (1.378) (1.470) (1.450) (1.470) (1.466) (1.251) NOTES: 1. Dimensions are in millimeters. Inch equivalents are given for information only. 2. Method of attachment to cover and or ring is optional. FIGURE 1. Protective cover, plug, all classes Continued. 3

6 STYLE N (ROPE AND RING) Dimensions Shell size K dia max L dia min M N (1.063) 18.0 (.709) (.807) (.709) (1.181) 20.0 (.788) (1.06) (.788) (1.220) 23.0 (.907) (0.886) (.709) (1.457) 26.0 (1.025) ( ) (.925) FIGURE 2. Protective cover, plug, rope and ring assembly, all classes. 4

7 Shell size K dia max (1.575) (1.732) (1.811) (1.929) L dia min 29.0 (1.141) 32.0 (1.260) 34.0 (1.339) 39.0 (1.538) M (1.240) (.984) (1.30) (1.043) (1.339) (1.083) ( ) (1.181) N NOTES: 1. Dimensions are in millimeters. Inch equivalents are given for information only. 2. Method of attachment to cover and or ring is optional. FIGURE 2. Protective cover, plug, rope and ring assembly, all classes Continued. REQUIREMENTS: Dimensions and configurations: See figures 1 and 2. Materials: Cover - Gasket - Ring - Rope - Classes C, F, G, R, T, W, and Z X: Impact extruded or machined aluminum alloy. Classes P, T and Z: Impact extruded or machined aluminum alloy. Classes H, K, N, S and Y: Corrosion resistant steel. Classes J and M: High performance resin in accordance with MIL-DTL Class F: Impact extruded or machined aluminum alloy. (Base materials only listed. For finishes or surface treatments for each class, see MIL-DTL ) Silicone elastomer. Corrosion resistant steel, passivated, mm (0.040 inches) maximum thickness. Insulated stainless steel, passivated. Passivation or proof of passive finish using ASTM A967 or equivalent is permissible. Insulation shall withstand 200 C. environment. Fastener - Stainless steel, passivated. Option: Aluminum integral to cover. 5

8 Mating connectors: MIL-DTL-38999, series IV plugs. Gasket shall be bonded to cover, or mechanically retained. Rope shall rotate freely on fastener. Fastener tensile strength: The protective cover and rope assembly shall withstand a dead weight tensile load of 25 pounds applied to both axial and longitudinal directions. The load shall be applied at the end of the rope assembly and held for 5 minutes. There shall be no separation of the rope assembly from the protective cover or damage to the rope assembly. Both axial and longitudinal directions shall be 25 pounds. The load shall be applied to the end of the rope. Air Leakage: Testing shall be in accordance with EIA , except the minimum period of measurement shall be 10 seconds. The air leakage rate shall be no greater than 1 atmospheric cubic inch per hour (4.55 X 10-3 cm 3 /s) Protective covers shall be mated to connectors having either contacts or inserts removed so that a pressure of 10 lbft/in 2 (.703 Kg/cm 2 ) can be applied against the insides of the protective covers or stowage receptacles. Qualification (all classes): Qualification shall be in accordance with MIL-DTL except only the following tests shall be required: Examination of product Coupling torque Humidity Salt spray (corrosion) Fastener tensile strength (see requirement) Air Leakage Qualification (classes J and M only): Qualification shall be in accordance with MIL-DTL-38999, except that in addition to the test sequence specified for all classes above, the following tests shall be required: Temperature cycling Hydrolytic stability Group A sampling inspection. Sampling for group A inspection shall be as specified in table I. TABLE I. Group A sampling plan. Lot size Sampling size 1 to percent 14 to units 151 to units 281 to units 501 to 1, units 1,201 to 3, units 3,201 and up 54 units 6

9 Part or Identifying Number (PIN) example: D38999/51 W 15 R Specification sheet number Class (see requirements) Shell size Style R - Rope N - With rope and ring Class F is not for Navy use and is inactive for use in Air Force new design. Change effectivity. Unless otherwise specified by the preparing activity and/or the qualifying activity, all changes from the previous revision of this specification sheet shall become effective within 90 days of the date of publication of the latest revision. If unable to implement changes within the 90 day time period, the manufacturer or value added distributor shall notify the qualifying activity. The qualifying activity shall determine if an extension may be granted. Disposition of stock. Unless otherwise specified by the qualifying activity and coordinated with the preparing activity, qualified manufacturers and their selling agents or distributors may continue to ship protective covers which were manufactured in accordance with the previous revision of this specification sheet for a period of 18 months from the date of the latest revision, provided that form, fit and function are not affected. Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue, due to the extent of the changes. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Referenced documents. In addition to MIL-DTL-38999, this document references the following: EIA ASTM-A967 7

10 CONCLUDING MATERIAL Custodians: Preparing activity: Army - CR DLA - CC Navy - AS Air Force - 85 (Project ) DLA - CC Review activities: Army - MI Navy - EC, MC, OS Air Force - 19, 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at 8