Amphenol Grommet Nut Backshell
ECONOMIC STRAIN RELIEF FOR CIRCULAR GROMMET SUPPORT
PEI-Genesis carries a wide array of backshell accessories for circular connectors. The Grommet Nut by Amphenol is an economical choice for grommet support and strain relief. Amphenol Back Nut provides a good grommet-holding force for the crimp connector when expensive and heavy backshells are unnecessary. Such holding force is essential to support the contacts and grommet in place when terminated with wire bundles. Not sure if your application requires a grommet nut or other accessory? Contact us today to discuss your application and allow us to guide you to the right decision.
AMPHENOL GROMMET NUT BACKSHELL MATERIALS & FINISHES
Aluminum Parts: As per ASTM B 211, 221, 209, 85, 26
Steel Parts: 300 series, as per AMS-QQ-S-763/ASTM A 582
Elastomers: Fluorosilicone, Silicone
Other Parts: Suitable corrosion resistant material
AMPHENOL GROMMET NUT BACKSHELL TABLE-2 PLATING FINISHES
Guiding Specifications/Requirements
To meet AS85049 requirements
AMS-A-8625, Type-III, Class -1
AMS-QQ-290, Class-1, Grade-F
AMS-C-26074, Class-4, Grade-B
To meet AS85049 requirements
AMS-QQ-P-416, Type-I, Class-2
AMS-QQ-P-416, Type-II, Class-3
Cadmium, Olive drab over Electroless Nickel
AMS-QQ-P-416, Type-II, Class-3 (Cadium); AMS-C-26074, Class-4, Grade-B (Nickel)
Cadmium, Olive drab over Electroless Nickel
To meet AS85049 requirements
Zinc-Cobalt, Dark Olive drab
*Non conductive coatings
AMPHENOL GROMMET NUT BACKSHELL ASSEMBLY TORQUE VALUES
AMPHENOL GROMMET NUT BACKSHELL STYLE-2 CONFIGURATION
Some design consideration will require bigger diameter cable to be terminated in the smaller shell size connectors. Cable with heavy/thicker shielding, many wires for different branches/routing are some of the examples. Such cable termination will require a bigger adapter body with cable entry dimensions greater than the connector rear side dimensions. Amphenol also supports this kind of application. The coupling end of the adapter will be modified to Style-2 design as shown in the figure below in such cases. The overall length of the Style-2 design adapters would be increased by approx. 1 inch (25.mm) as shown. This alternative design is applicable for all the Backshell Families listed in this catalog.
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AMPHENOL GROMMET NUT BACKSHELL M85049/31 MIL-DTL-26482 SERIES II, MIL-DTL-5015 MATRIC (MS345X), MIL-DTL-83723 SERIES III STRAIGHT SELF-LOCK/NON SELF-LOCK CREATE PART NUMBER EXAMPLE: M85049/31S12W
COUPLING S: Self-Lock "-": Non Self-Lock
AMPHENOL GROMMET NUT BACKSHELL M85049/27 MIL-DTL-38999 SERIES II & I STRAIGHT SELF-LOCK/NON SELF-LOCK CREATE PART NUMBER EXAMPLE: M85049/27S12W
COUPLING S: Self-Lock "-": Non Self-Lock
AMPHENOL GROMMET NUT BACKSHELL M85049/14 MIL-DTL-38999 SERIES III & SERIES IV STRAIGHT SELF-LOCK/NON SELF-LOCK CREATE PART NUMBER EXAMPLE: M85049/14S15W
COUPLING S: Self-Lock "-": Non Self-Lock
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AMPHENOL GROMMET NUT BACKSHELL M85049/31 MIL-DTL-26482 SERIES II, MIL-DTL-5015 MATRIX (MS345X), MIL-DTL-83723 SERIES III STRAIGHT SELF-LOCK/NON SELF-LOCK DIMENSIONS
Mil Part Number Designator Dash No.
All dimensions for reference only.
All dimensions in inches (millimeters in parentheses)
AMPHENOL GROMMET NUT BACKSHELL MIL-DTL-38999 SERIES II & I STRAIGHT SELF-LOCK/NON SELF-LOCK DIMENSIONS

Mil Part Number Designator Dash No.
Connector Shell Size Series II / I
All dimensions for reference only.
All dimensions in inches (millimeters in parentheses)
AMPHENOL GROMMET NUT BACKSHELL M85049/14 MIL-DTL-38999 SERIES III & IV STRAIGHT SELF-LOCK/NON SELF-LOCK DIMENSIONS

MIL Part Number Designator Connector Shell Size
Connector Shell Size / Code (Ref.)
All dimensions for reference only.
All dimensions in inches (millimeters in parentheses)
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