M85049/49-12W Straight Backshell, Olive Drab Cadmium, D38999 Size 12
M85049/49-12W Straight Cable Clamp Backshell for D38999 Circular Aerospace Connectors
The M85049/49-12W is a straight cable clamp backshell designed for circular electrical connectors. It is the AS85049 / GJB1784 standard part number, interchangeable with J1784/49-12W, and is commonly used with GJB599 / D38999 Series I and Series II connectors in shell size 12.
As an HB-type (industry designation HB-B12) accessory, the M85049/49-12W provides anti-rotation retention and straight-exit mechanical strain relief without EMI shielding braid termination. Tightening the clamp ring onto the grommet helps secure the cable and improve the connector's environmental resistance in tensioned-cable installations.
Product Features
- Conformant to national standard GJB1784 (equivalent to AS85049)
- Interchangeable with cross-reference part number J1784/49-12W
- Straight cable clamp backshell for axial cable exit and strain relief
- Anti-rotation design with clamp-ring sealing for improved environmental durability
- Suitable for crimp GJB599 Series I / II connectors where cable clamping without EMI shielding is required
- Cadmium plating finish denoted by the W suffix (olive drab)
- Shell size 12 for D38999 / GJB599 circular connector interfaces
Technical Specifications - M85049/49-12W
| Parameter | Value |
|---|---|
| Part Number | M85049/49-12W |
| Equivalent Part Number | J1784/49-12W |
| Accessory Type | M85049/49 (HB type) straight cable clamp |
| Industry Designation | HB-B12 |
| Shell Size | 12 |
| Finish | W - Olive drab cadmium plating |
| D1 (mm) | 23.6 |
| Thread D2 | 0.6875-24 |
| Cable Opening D (mm) | 4.83 ~ 8.33 |
| A (mm) | 24.5 |
| L (mm) | 26.7 |
| Function | Straight strain relief / cable clamp (no EMI shielding braid termination) |
| Compatible Connectors | GJB599 Series I & II / D38999 Series I & II |
Part Number Breakdown
| Segment | Meaning |
|---|---|
| M85049 | AS85049 / GJB1784 connector accessory series (interchangeable naming with J1784) |
| /49 | HB-type straight cable clamp backshell |
| -12 | Shell size 12 |
| W | Olive drab cadmium finish |
Related finish option: M85049/49-12N (HB-F12) uses electroless nickel finish. There is no functional difference between model prefixes marked "M85049" and related AS85049 designations.
Compatible Applications
The M85049/49-12W straight backshell is intended for aerospace, avionics, and industrial platforms that use D38999 / GJB599 circular connectors and require axial cable exit with mechanical strain relief. Typical use cases include:
- Aircraft and helicopter wiring harnesses with straight rear cable routing
- Ground vehicles and rugged electronic enclosures
- Avionics LRUs, radar, and communication equipment
- Shipboard and rugged industrial connector assemblies
- Cable-tension environments that need clamp-style strain relief without EMI braid termination
Selection Guide
| Requirement | Recommended Accessory |
|---|---|
| No cable clamp, no shielding | M85049/27 (HA type) tail nut |
| Straight cable clamp, no shielding | M85049/49 (HB type) - this product |
| 90 degree cable clamp, no shielding | M85049/47 (HC type) |
| EMI shielding / shrink-boot style | M85049/62, M85049/62 series, or M85049/18A series |
Installation Notes
- Implement at least one anti-loosening method: safety wire through lock holes, thread-locking compound on the coupling nut, or full heat-shrink over the accessory.
- If clamp screws are used, apply thread-locking compound before final torque.
- Shell numbers for these accessories must be even; odd shell sizes are not used.
- For connectors with #8 contacts, consider longer cable accessories (e.g. M85049/49H or M85049/18A) to avoid interference with contact positioning hardware.
- Strain-relief-only backshells such as M85049/49-12W are best suited to clean, dry applications; for full environmental sealing plus EMI protection, select a shielded environmental backshell.
Why Choose M85049/49-12W
Form-Fit-Function Compatibility
Choosing the M85049/49-12W ensures form-fit-function compatibility with J1784/49-12W supply chains while meeting GJB1784 / AS85049 requirements. The straight HB clamp geometry secures axial cable exits behind Series I / II circular connectors, reduces strain on crimp terminations, and supports reliable operation in aerospace and industrial interconnect systems.
Ordering Information
Order by the AS85049 designation M85049/49-12W, or cross-reference as J1784/49-12W / industry code HB-B12, depending on your procurement standard.
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