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M85049/95-14A – Glenair Shield Termination Self-Locking Nutplate
Available now on the Airparts.aero Marketplace.
The M85049/95-14A is a high-performance circular connector accessory manufactured by Glenair. Designed under the AS85049 military specification, this "Nutplate" (specifically a shield termination backshell component) is used to provide a secure, threaded mounting surface for EMI/RFI shield termination bands or backshell assemblies. It is sized for Shell Size 14 connectors and features integrated 4-40 threaded holes for hardware attachment.
Constructed from rugged aluminum alloy with a Black Anodize finish (as denoted by the "A" suffix), the M85049/95-14A is engineered to provide mechanical strain relief and electrical continuity in high-vibration aerospace environments. It is a critical component for technicians building or repairing "Shielded" wiring harnesses, where maintaining a $360^\circ$ electrical bond is required to protect sensitive data lines from electromagnetic interference.
Key Features
Self-Locking Architecture: Features an internal mechanism designed to resist loosening under the extreme harmonic vibrations typical of aircraft engine compartments and airframes.
Shell Size 14 Compatibility: Precision-machined to mate perfectly with MIL-DTL-38999 Series III and IV, as well as other circular connectors utilizing the Size 14 geometry.
Integrated 4-40 Nutplates: Provides robust, pre-threaded mounting points for backshell screws, eliminating the need for fumbling with tiny loose nuts in confined avionics bays.
EMI/RFI Protection: Facilitates the "grounding" of cable shielding to the connector shell, ensuring the integrity of fly-by-wire and communication signals.
Corrosion-Resistant Anodizing: The "A" code signifies a non-conductive black anodize finish, providing excellent surface hardness and resistance to environmental salt spray and hydraulic fluids.
Technical Specifications
Part Number: M85049/95-14A
Manufacturer: Glenair (OEM)
Military Specification: AS85049/95
Shell Size: 14
Threaded Hole Size: 4-40 UNC
Material: Aluminum Alloy
Finish: Black Anodize (Non-conductive)
Weight: 0.04 lbs (Approx. 18 grams)
Coupling: Self-Locking
Connector Compatibility
MIL-DTL-38999: Series III and IV (Circular High-Density).
MIL-DTL-26482: Series II.
AS81703: Series III.
Note: While the nutplate is "Size 14," always verify the clocking and accessory thread pitch of the connector shell against the Glenair Master Catalog to ensure a seamless fit.
Applications
The M85049/95-14A is utilized for Wiring Harness Integrity. Its primary roles include:
Shield Termination: Providing the mechanical base for banding a cable shield to the connector.
Backshell Mounting: Serving as the threaded anchor for protective backshell housings.
Strain Relief: Helping to transition the wire bundle into the connector shell without stressing the individual solder or crimp contacts.
Why Choose M85049/95-14A?
Choosing the genuine Glenair M85049/95-14A ensures Electrical Bonding and Mechanical Security. Non-spec accessories often lack the precision-rolled threads required for the 4-40 hardware, leading to "stripped" threads during installation. The Glenair self-locking feature is governed by the physics of Frictional Interference; it maintains a constant "running torque," ensuring the accessory stays tight even through thousands of thermal expansion and contraction cycles at high altitude.
The M85049/95-14A functions as a Mechanical Load Path and EMI Grounding Interface. In the context of Faraday Cage theory, the nutplate ensures that the gap between the cable shield and the connector body is minimized. By using the integrated 4-40 threads, the backshell can be torqued to a specific value, creating a high-pressure contact zone that reduces Transfer Impedance. This is essential for preventing "crosstalk" between adjacent wiring bundles in the high-density electrical environment of a modern turbine cockpit.
Note: This is a wiring harness accessory. Installation should be performed by a certified avionics technician or harness specialist. Ensure that the 4-40 mounting screws are of the appropriate length; screws that are too long can bottom out and damage the connector shell. For applications requiring electrical conductivity (EMI grounding), verify if the "A" (Anodize) finish is appropriate, or if a "N" (Electroless Nickel) conductive finish is required by your engineering drawing.
