M85049/47-12W 90 Degree Curved Backshell for D38999 Circular Aerospace Connectors

The M85049/47-12W is a 90 degree angled cable clamp backshell designed for circular electrical connectors. It is the AS85049 / GJB1784 standard part number, interchangeable with J1784/47-12W, and is commonly used with GJB599 / D38999 Series I and Series II connectors in shell size 12.

As an HC-type (industry designation HC-B12) accessory, the M85049/47-12W provides anti-rotation retention, 90 degree cable routing, and mechanical strain relief without EMI shielding braid termination. Tightening the clamp ring helps seal the cable body 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 J1784/47-12W
• 90 degree curved backshell for compact cable routing and strain relief
• Anti-rotation design with clamp-ring sealing for improved environmental durability
• Suitable for crimp and solder 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 - M85049/47-12W

Part Number Breakdown

Related finish option: M85049/47-12N (HC-F12) uses electroless nickel finish. There is no functional difference between model prefixes marked "M85049" and related AS85049 designations.

Compatible Applications

The M85049/47-12W 90 degree backshell is intended for aerospace, avionics, and industrial platforms that use D38999 / GJB599 circular connectors and require right-angle cable exit with mechanical strain relief. Typical use cases include:

• Aircraft and helicopter wiring harnesses with limited rear clearance
• Ground vehicles and rugged electronic enclosures
• Avionics LRUs, radar, and communication equipment
• Shipboard and rugged industrial connector assemblies
• Cable-tension environments where a straight backshell cannot be used

Selection Guide

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 M85049/47-12W are best suited to clean, dry applications; for full environmental sealing plus EMI protection, select a shielded environmental backshell.

Why Choose M85049/47-12W

Form-Fit-Function Compatibility

Choosing the M85049/47-12W ensures form-fit-function compatibility with J1784/47-12W supply chains while meeting GJB1784 / AS85049 requirements. The 90 degree HC clamp geometry simplifies harness routing behind Series I / II circular connectors, reduces strain on solder or crimp terminations, and supports reliable operation in aerospace and industrial interconnect systems.

Ordering Information

Order by the AS85049 designation M85049/47-12W, or cross-reference as J1784/47-12W / industry code HC-B12, depending on your procurement standard.