MIL-DTL-26482 Connector Standards & Intermateability Guide
Comprehensive Specification Sheet Breakdown, Technical Characteristics & Critical Mating Warning Guidelines
1. Technical Uniqueness of Series 1 and Series 2
The MIL-DTL-26482 specification defines miniature circular environmental bayonet-coupling connectors designed to protect contacts during mating. The specification is divided into two distinct series: Series 1 and Series 2. Each series possesses unique operational ceilings, contact retention mechanics, and environmental class options.
- Series 1 Connectors (-55°C to +125°C): Utilize solder pot contacts (non-removable, fixed in polychloroprene insert) or front-release removable crimp contacts (SAE-AS39029/31 pin, SAE-AS39029/32 socket). Front-release insertion/removal tools (SAE-AS81969/17 and /19) are required. Environmental classes include Class E (grommet seal), Class F (strain relief clamp), Class P (potted seal), Class J (gland seal for jacketed cable), and Class H (hermetic seal).
- Series 2 Connectors (-55°C to +175°C / +200°C): Utilize rear-release removable crimp contacts (SAE-AS39029/4 pin, SAE-AS39029/5 socket) operating with rear plastic insertion/removal tools (SAE-AS81969/14). Solder contacts in Series 2 are restricted exclusively to Class H hermetic receptacles (MS3440, MS3442, MS3443, MS3449). Standard environmental classes include Class A (200°C anodized), Class L (200°C electroless nickel, fluid resistant), Class W (175°C olive drab cadmium), Class K (175°C black zinc-nickel), Class T (175°C nickel fluorocarbon), and RFI shielded plugs (MS3475).
2. Critical Intermateability Guidelines & Mating Warnings
While MIL-DTL-26482 Series 1 and Series 2 connectors feature the same 3-point bayonet coupling mechanism and shell sizes, cross-mating between series involves strict engineering limitations and performance de-rating.
| CRITICAL SYSTEM INTEGRATION & MATING WARNINGS • Power Contacts Restriction Only: Mating between Series 1 and Series 2 connectors is permitted ONLY when both counterpart connectors contain a FULL COMPLEMENT OF POWER CONTACTS. Mating connectors containing Size 8 shielded (coaxial) contacts across series is strictly prohibited.• Physical Alignment Prerequisites: Mated connectors must match exact Shell Size (Sizes 8 through 24), Insert Layout Arrangement (conforming to MIL-STD-1669), and Key/Keyway Polarization Position (N, W, X, Y, Z).• Operating Temperature De-rating: When a Series 2 connector (rated 175°C/200°C) is mated with a Series 1 connector (rated 125°C), the maximum allowable hot-spot operating temperature of the assembly is RESTRICTED TO 125°C. Exceeding 125°C will degrade Series 1 seals.• Mechanical Shock & Vibration De-rating: Series 1 is qualified under EIA-364-28 Condition III (10 μs maximum electrical discontinuity), whereas Series 2 is tested under high random vibration (EIA-364-28 VI-J, 1 μs maximum discontinuity). An intermated pair must be de-rated to Series 1 mechanical limits.• CRITICAL TOOLING WARNING: Front-release contacts (Series 1) and rear-release contacts (Series 2) use completely incompatible insertion/extraction tools. Attempting to insert a rear-release tool into a Series 1 front-release insert (or vice-versa) will PERMANENTLY DAMAGE the internal metallic contact retention clips and destroy the moisture seal face. |
Table 2.1: Operational De-rating Matrix for Intermated Series 1 & Series 2 Connectors
| Performance Parameter | Series 1 Standalone Limit | Series 2 Standalone Limit | Mated Assembly Ceiling |
| Max Operating Temp. | -55°C to +125°C | -55°C to +175°C / +200°C | DE-RATED TO +125°C MAX |
| Electrical Discontinuity | 10 microseconds max | 1 microsecond max | DE-RATED TO 10 μs MAX |
| Contact Retention Release | Front Release (SAE-AS81969/17) | Rear Release (SAE-AS81969/14) | NON-INTERCHANGEABLE TOOLS |
| Allowed Contact Types | Power & Coaxial (Size 8) | Power & Coaxial (Size 8) | POWER CONTACTS ONLY (No Coax) |
3. MIL-DTL-26482 Series 1 Military Standard Connectors
Series 1 military standards encompass non-removable solder contact connectors and front-release removable crimp connectors. Table 3.1 details all active MS specification sheets.
| MS Standard | Termination Type | Mounting / Shell Style | Class Availability & Description |
| MS3110 | Solder (Non-Removable) | Wall Mount Receptacle | Classes E, F, J, P. Environment resisting with grommet, potted, or gland seal. |
| MS3111 | Solder (Non-Removable) | Cable Connecting Plug | Classes E, F, J, P. In-line cable receptacle connection. |
| MS3112 | Solder (Non-Removable) | Box Mount Receptacle | Class E. Low-profile flange mount without rear accessory threads. |
| MS3114 | Solder (Non-Removable) | Jam Nut Receptacle | Classes E, F, H, P. Single-hole rear panel mount; includes hermetic Class H. |
| MS3116 | Solder (Non-Removable) | Straight Cable Plug | Classes E, F, J, P. Standard straight plug with coupling ring. |
| MS3119 | Solder (Non-Removable) | Thru-Bulkhead Adapter | Class E. Double-ended pin/socket flange mount bulkhead feedthrough. |
| MS3120 | Solder / Crimp Front | Wall Mount Receptacle | Classes E, F, P. Front-release crimp removable contact system (#4 holes). |
| MS3121 | Solder / Crimp Front | Cable Connecting Plug | Classes E, F, P. In-line cable connector with front-release crimp contacts. |
| MS3122 | Solder / Crimp Front | Box Mount Receptacle | Class E. Box mounting receptacle with front-release crimp contacts. |
| MS3124 | Solder / Crimp Front | Jam Nut Receptacle | Classes E, F, P. Jam nut rear panel mounting with front-release crimp. |
| MS3126 | Solder / Crimp Front | Straight Cable Plug | Classes E, F, P. Straight plug with front-release crimp contacts. |
| MS3127 | Solder / Crimp Front | Box Mount Receptacle | Class E. Box mount receptacle with No. 4/6 mounting holes. |
4. MIL-DTL-26482 Series 2 Military Standard Connectors
Series 2 military standards specify high-temperature rear-release crimp connectors and Class H glass-sealed hermetic solder receptacles. Table 4.1 outlines all active Series 2 MS sheets.
| MS Standard | Termination Type | Mounting / Shell Style | Class Availability & Description |
| MS3470 | Crimp Rear Release | Narrow Flange Receptacle | Classes A, D, L, T, W, K. Wall mount receptacle with narrow flange footprint. |
| MS3471 | Crimp Rear Release | Cable Connecting Receptacle | Classes A, D, L, T, W, K. In-line cable receptacle with rear accessory threads. |
| MS3472 | Crimp Rear Release | Wide Flange Receptacle | Classes A, D, L, T, W, K. Wall mount receptacle with wide mounting flange. |
| MS3474 | Crimp Rear Release | Jam Nut Receptacle | Classes A, D, L, T, W, K. Single-hole rear panel jam nut mounting. |
| MS3475 | Crimp Rear Release | RFI Shielded Plug | Classes A, D, L, T, W, K. Straight plug with RFI grounding fingers for EMI shielding. |
| MS3476 | Crimp Rear Release | Straight Cable Plug | Classes A, D, L, T, W, K. Standard straight bayonet plug with rear release crimp. |
| MS3440 | Solder / Eyelet (Fixed) | Narrow Flange Hermetic | Class H. Glass-to-metal sealed narrow flange receptacle (200°C). |
| MS3442 | Solder / Eyelet (Fixed) | Wide Flange Hermetic | Class H. Glass-to-metal sealed wide flange receptacle (200°C). |
| MS3443 | Solder / Eyelet (Fixed) | Solder Flange Hermetic | Class H. Steel shell receptacle for direct soldering or welding to bulkhead. |
| MS3449 | Solder / Eyelet (Fixed) | Jam Nut Hermetic | Class H. Glass-sealed jam nut receptacle with single-hole panel mounting. |
5. Military Standard Accessories & Contact Retention Test Gages
The MIL-DTL-26482 specification governs standardized protective caps, wire cavity sealing plugs, and contact retention inspection test gages used across Series 1 and Series 2.
| MS Standard | Accessory Description | Functional Scope & Compatibility |
| MS3180 | Protective Cap for Plugs | Bayonet coupling protective cover for Series 1 and Series 2 plugs. Available in Cadmium (W) and Zinc-Nickel (K) finishes. |
| MS3181 | Protective Cap for Receptacles | Bayonet coupling protective cover for Series 1 and Series 2 receptacles with sash chain or wire rope lanyards. |
| MS3187 | Grommet End Seal Plug | Fluorosilicone sealing plug inserted into unwired contact cavities to preserve environmental sealing integrity. |
| MS3461 | Contact Retention Test Gage | Precision test gage for verifying rear-release contact retention mechanism in MIL-DTL-26482 Series 2 connectors. |
| MS3462 | Class N Retention Test Gage | Specialized test gage for verifying contact retention features in Class N hermetics of MIL-DTL-26482 Series 2. |