METRIC MIL-DTL-38999/21C 10 July 2008 SUPERSEDING MIL-DTL-38999/21B 11 June 2001 DETAIL SPECIFICATION SHEET CONNECTORS, ELECTRICAL, CIRCULAR, THREADED, RECEPTACLE, BOX MOUNTING FLANGE, HERMETIC, HERMETIC SOLDER CONTACTS, SERIES III, METRIC 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-38999. FIGURE 1. Receptacle, classes N and Y . AMSC N/A FSC 5935 MIL-DTL-38999/21C Connector dimensions Shell size Shell size code P .20 PP .20 R1 (see note 3) R2 (see note 4) S .3 V max 9 A 3.25 (.128) 5.49 (.216) 18.26 (.719) 15.09 (.594) 23.8 (.937) 21.4 (.843) 11 B 3.25 (.128) 4.93 (.194) 20.62 (.812) 18.26 (.719) 26.2 (1.031) 21.4 (.843) 13 C 3.25 (.128) 4.93 (.194) 23.01 (.906) 20.62 (.812) 28.6 (1.126) 21.4 (.843) 15 D 3.25 (.128) 4.39 (.173) 24.61 (.969) 23.01 (.906) 31.0 (1.220) 21.4 (.843) 17 E 3.25 (.128) 4.93 (.194) 26.97 (1.062) 24.61 (.969) 33.3 (1.311) 21.4 (.843) 19 F 3.25 (.128) 4.93 (.194) 29.36 (1.156) 26.97 (1.062) 36.5 (1.437) 21.4 (.843) 21 G 3.25 (.128) 4.93 (.194) 31.75 (1.250) 29.36 (1.156) 39.7 (1.563) 21.4 (.843) 23 H 3.91 (.154) 6.15 (.242) 34.93 (1.375) 31.75 (1.250) 42.9 (1.689) 21.4 (.843) 25 J 3.91 (.154) 6.15 (.242) 38.10 (1.500) 34.93 (1.375) 46.0 (1.811) 21.4 (.843) NOTES: 1. Dimensions are in millimeters. 2. Polarizing position N is shown. 3. Front or rear panel mounting. 4. Front panel mounting only. 5. Inch equivalents are given for information only. FIGURE 1. Receptacle, classes N and Y - Continued. 2 MIL-DTL-38999/21C REQUIREMENTS: Dimensions and configurations: See figure 1. Interface dimensions shall conform to MIL-DTL-38999. This connector mates with MIL-DTL-38999/26. Insert arrangements: See MIL-STD-1560. Part or identifying Number (PIN) example: D38999/ 21 Y A 35 DoD no. prefix Specification sheet no. Class Shell size code Insert arrangement Contact style Polarizing position N is required for normal position 3 P N MIL-DTL-38999/21C 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. Referenced documents. In addition to MIL-STD-38999, this document references the following: MIL-DTL-38999/26 MIL-STD-1560 CONCLUDING MATERIAL Custodians: Army - CR Navy - AS Air Force - 85 DLA - CC Preparing activity: DLA - CC (Project 5935-2008-019) Review activities: Army - AR, MI Navy - EC, MC, OS Air Force - 19, 99 DLA - IS NOTE: The activities listed above were interested in this document as of this document. Since organization and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http://assist.daps.dla.mil. 4