This specification covers environment and fluid resisting@ rectangular type@ rack to panel electrical connectors (plugs and receptacles). These connectors utilize individually sealing removable crimp type contacts and are capable of continuous operation from ?C65 to +150 ?? Classification Part Number Part Number for Connectors The connector part number shall consist of the letter ??M??@ the basic number of the applicable specification sheet (see 3.1)@ and the applicable alpha-numeric characters@ formulated as in the following example: M85028/1-1P1RN M85028/1 Basic Part Number (1.2.1.4) -1 Dash Number (1.2.1.5) P1 Contact Designator (1.3.3) RCenterHardware (1.2.1.7) NPolarization(1.2.1.8) Part Number for Connector Accessories The part number for the accessories shall consist of the letter ??M??@ the basic number of the specification sheet and assigned dash numbers as indicated on the applicable specification sheet (see 3.1) (Example: M85028/5-2). Classes E ?C Environmental and Fluid Resisting Basic Part Number The basic part number shall be as shown on the applicable specification sheet. Revision letters shall not be included. Dash Number The dash number shall be as shown on the applicable specification sheet for the basic part number. Contact Designator Connectors with Contacts The following designators are used to indicate a full complement of applicable contacts (see 3.1). P ?C Pin Contacts S ?C Socket Contacts Contact Wire Barrel Size Contact wire barrel size shall be indicated by one of the following: a. No Contacts b. 24 to 28 wire gauge c. 20 to 24 wire gauge d. 16 to 20 wire gauge Connectors Without Contacts The following designators are used to designate connector less contacts. They will be used only when less than a 100% complement of one size wire barrel is used. Wire barrel size shall be designated by an ??O??. A ?C Less Pin Contacts B ?C Less Socket Contacts Center Hardware Designator The connector center hardware type shall be designated by one of the following: R ?C Recessed jackscrew J ?C Extended jackscrew F ?C Threaded female Polarization The connector center hardware polarization shall be designated by a letter as shown on Figure 2 (see 3.4.8).