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Locking Inserts

How Locking Inserts Work Locking Insert Design

The Recoil screw-locking insert is designed to providea 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 ofuniquely 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 specificallydesigned 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. Should a specific locking torque or function berequired,AFS engineers can develop parts to suit customers ’ needs.As the bolt is wound through the lock-ing chords of the insert it deflects the wire as shown by the internal arrows (A).This deflection causes the insert to push against the bolt resulting in a repeatable locking function from the insert.

Recoil Technical catalogue - 19519 (A)

Note:Installation of Recoil screw-locking inserts requiresuse of the Recoil Prewinder tooling. (Refer to page 25 -Tooling) Note:It is recommended that a cadmium plated or dry-film lubricated screw/bolt is used for screw-lockinginserts applications. (See page 9 - Lubricants and Coatings) 7