Locking Inserts



The Recoil screw-locking insert is designed to provide a screw-locking feature which will retain screws or bolts under the most severe vibration or varying temperature conditions. The insert locking configuration comprises a series of uniquely designed locking chords which, upon the engagement of a screw or bolt, deflect radially to permit the installation of the bolt. Upon bolt entry, these straight segments are flexed outwardly, creating pressure on the bolt. This pressure is applied between the flanks of the bolt thread so that contact area is maximized.

Locking inserts retain locking torque over numerous assembly cycles. Refer to relevant specifications for insert life. Each Recoil screw-locking insert type has a specifically designed locking configuration. This ensures that the insert meets its design specification requirements. Therefore the shape, depth, and number of locking chords will inevitably vary for differing thread types and sizes.

NOTE: Recoil locking inserts are supplied coloured in a red surface dye as standard for differentiation from standard inserts.

Both screw-locking and free-running inserts are available on plastic strips for automated tooling systems.


  • Increased bolt retention in vibrating applications
  • Consistent performance against temperature variations
  • Available in Metric, UNC and UNF thread forms. Others on request.


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