Backshell Solutions

For sealed and unsealed systems, TE’s backshells provide protection and strain relief at cable termination and offer a geometry designed for secure installation of heat-shrinkable molded parts.

A range of options for sealed systems. TE backshell adapters fit a wide range of circular connectors and are available in a variety of materials and finishes with options to meet your needs, including low-profile fixed adapters for when future access is not required, spin-coupling adapters that enable in-service repair, and KTKK assemblies that combine environmental sealing and mechanical protection in one easy installation step. 

Solid Adapters (Fixed)

Solid adapters are designed for use where no access is required. For example, when potting is necessary or a lower space profile is needed. These adapaters have a boot groove to accomodate a lipped heat-shrinkable boot. Repair cannot be made without removing the boot.


Connector Code Part Description Connector Mil Specification
18 218M5 AS50151(AS31001)
21 203M6 MIL-DTL-26482 Series 1
40 209M3 MIL-DTL-38999 Series III and IV
41 202M1 MIL-DTL-38999 Series 1 and II
54 201M9 AS50151 (AS34001), MIL-DTL-26482 Series 2, MIL-DTL-83723 Series I and III, AS81703 Series III

Spin-Coupling Adapters

Spin-coupling adapters are two-part components that have a rotatable coupling nut and a grooved body designed to accommodate lipped-type heat-shrinkable boots.  

Spin-couplings with an appropriate molded part are used for environmental protection and strain relief of unscreened cable terminations. Cable repairs can be made without damaging the boot.


Connector Code Part Description Connector Mil Specification
18 218M6 AS50151(AS31001)
21 203M9 MIL-DTL-26482 Series 1
40 209M4 MIL-DTL-38999 Series III and IV
41 202M2 MIL-DTL-38999 Series 1 and II
54 201M1 AS50151 (AS34001), MIL-DTL-26482 Series 2, MIL-DTL-83723 Series I and III, AS81703 Series III


Raychem Spin Lock Variable Angle Backshell

The Raychem spin lock variable angle backshell enables straight, 45o and 90o cable terminations with the same part. The connector backshell swivelling body rotates around the axis of the cable bundle and locks in position, minimizing stress on the wire bundle and providing more robust strain relief than other termination system.  

Saddle clamp strain relief or heat-shrinkable molded shape provides strain relief and sealing. 


Saddle Clamp Version  SLC
Molded Boot Version SLM
Clamp Only SLCMM*
Body Only SLX

* MM = plating 

Material Codes

Material Description Material Code: Solid, Spin-Coupling Adapter Material Code: Spin-Lock Adapter Finish Codes
Aluminum alloy 19 A Standard material for normal applications
Stainless steel 62 S Corrosion-resistant and high-temperature (firewall) applications
Nickel aluminum bronze 01 N/A Exposed marine environments 

Finish Codes

Finish Description Color Finish Code Finish Code: Spin-Lock Adapter
Cadmium, per QQ-P-416, Type II, Class 3 over electroless nickel Olive Drab B Available 
Electroless nickel, per AMS-C-26074, Class 4, Grade B Bright Silver Available
Anodized, hard, per MIL-A-8625, Type III, Class 2 Black G Not Available
Passivated, per QQ-P-35 or MIL-S-5002  - J Available
Unplated, shotblast  -  W Not Available
Zinc Nickel Black Available 


  • Designed to be used with heat-shrinkable boots
  • Variable angle backshells provides inventory reduction with one simple part
  • Spin coupling adapter allows re-entry for repair
  • KTKK assemblies offer one-piece easy installation




  • Short overall body length to fit where space is constrained
  • Fits most circular connector designs
  • Wide range of matching materials and finishes to connectors
  • Provides strain-relief 
  • Accommodates a wide range of cable diameters

Typical Applications

  • Repairable electrical harnesses for electronic interconnect systems
  • Sealed cabling used with military circular connectors
  • On board sealed Naval electrical cable
  • Outdoor radar station sealed electronic harnesses