How should I proceed for tightening my backshell ? - Circular connectors

This article details the possible methods for applying the torque values on your backshells.

However, Amphenol Socapex does not recommend any particular tool or adapter references.

We recommend that you contact a tool manufacturer to obtain appropriate tools.


Usually, it is possible to use a torque wrench with standard adapters for connectors:


Depending on the connector you wish to tighten the backshell, you will first need to:

  • Put the appropriate adapter on the torque wrench
  • Pre-screw the backshell onto the connector by hand
  • Couple (lock the connector) with the adapter


Alternatively, you can use dummy receptacles with coding, which are available for most of our ranges.

This allows you to lock your plugs to these and apply the desired torque directly with the torque wrench tool.

Below is an example for MIL-DTL-38999 series 3 connectors (consult us for other series):


IMPORTANT NOTE: Avoid using universal coded dummy receptacles as the force is not applied to all keys, which may damage your connector!


In both cases, the following procedure must be followed when tightening the backshells:

"The procedure for mounting rear accessories may vary from one equipment manufacturer to another in terms of the torque to be applied.

The use of Loctite is either required or excluded.

For aluminium alloy rear fittings, if the use of Loctite is excluded, the best performance over time of the "connector + rear fitting" system is to apply the torque value first, then unscrew, apply the torque value a second time, then unscrew and finally apply the torque value a third time."

For torque values, you can refer to following articles: Backshell's tightening torque values - MIL circular connectors and Backshell's tightening torque values - FIELD connectors



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