scope:

This specification covers circular electrical connectors with removable crimp front release contacts. These connectors are for use with jacketed cable in shipboard applications.

These connectors are rated for specified operation within a temperature range of −55 C (−67 F) to 200 C (392 F). The upper temperature is the maximum internal hot-spot temperature resulting from any combination of electrical load and ambient conditions.

Insulation resistance limits vary with temperature (see Figure 1).

Service life varies with temperature (see Figure 2 and Table I).

The connector part number for qualified connectors procured in accordance with this specification shall consist of the letter "M", the basic number of the applicable specification sheet and the applicable alphanumeric characters formulated as in the following examples. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Naval Electronic Systems Command, Department of the Navy, Washington, DC 20360, by using the selfaddressed Standardization Document Improvement Proposal DD Form 1426) appearing at the end of this document or by letter. TABLE I Connector Classes - Physical Characteristics

Shell and Coupling Ranges Fluid Class Hot Spot Service Insert ---------------------------- Code Class Feature Temperature (°C) Life Material Material Finish Resistance ------------------------------------------------------------------------------------------------------------------------------------ Cadmium A D High Impact 125 20 yrs. Fluoro Wrought olive drab Complete Shock 200 1/ 1000 hrs. silicone Aluminum over nickel Aluminum over nickel B DS High Impact 125 20 yrs. " Carbon Cadmium Complete 200 1/ 1000 hrs. Resistant Steel 316 C DJ High Impact 125 20 yrs. " Wrought Cadmium Complete shock with 200 1/ 1000 hrs. Aluminum olive drab backshell over nickel connector assembly E DJS High Impact 125 20 yrs. " Carbon Cadmium Complete shock with 200 1/ 1000 hrs. Resistant Steel backshell 316 connector assembly Note: 1/ Hot spot test requirement for inserts and seals shall be 200°C.

The class of the connector shall be identified as shown in Table I.

The shell size shall be identified as shown in Table II. TABLE II Shell Sizes

Designator Sizes ------------------------- A 11 B 13 C 15 D 17 E 19 F 23 G 25 H 29 J 33

The insert arrangement shall be a single digit indicating the insert pattern in accordance with the applicable insert arrangement in MIL-STD-1698.

The following designators shallidentify the various contact styles.

P- Pin Contacts -20-22 S- Socket Contacts -20-22 D- Pin Contacts -20-28 E- Socket Contacts -20-28 F- Pin Contacts -20-20 G- Socket Contacts -20-20

The key or key way position shall be identified by the appropriate number 1, 2, 3, 4, 5 or 6 in accordance with Figure 3.

The backshell designator shall be identified by the appropriate letter A, B, C, or D in accordance with applicable specification sheets.

Connectors shall have a threaded coupling in accordance with Figures 8 and 9.

Receptacle mounting shall be designed as follows:

Flange Jam Nut

The contact designation shall be as specified in MIL-C-39029.

The wire ranges given in Table III shall be accommodated by the connectors as indicated. TABLE III Wire Range Accommodations

Contact Wire Outside Diameter of Finished Wire (inch) 1/ -------------------------------------------------- Size Size Minimum Maximum -------------------------------------------------------------------- 20-20 24 .040 .070 22 .040 .070 20 .040 .070 20-22 26 .040 .070 24 .040 .070 22 .040 .070 20-28* 32 .040 .070 30 .040 .070 28 .040 .070 * To obtain sealing, wires must be built up to finished wire diameter (see 6.1.1). 1/ In accordance with MIL-C-915 and MIL-W-16878.

intended Use: