Nov 99 - Wire Insert Length Selection

Wire Insert Length Selection

Heli-Coil screw-thread wire inserts are available in 5 standard lengths. Insert availability in 1,1- ½, 2, 2 -1/2, and 3 times the nominal thread diameter provide thread length combinations to fit most every application. 

To properly choose an insert length, several factors must be considered. Knowledge of the parent material strength, bolt material and strength as well as the specific load requirements of the application must be weighed to insure the integrity of the threaded joint.

To assist in this choice, Heli-Coil publishes a Tensile Strength Bulletin, Bulletin 68-2 which provides tensile strength information for the various thread sizes and lengths of inserts available as installed in a variety of common parent materials.

For most general applications, a 1-1/2 or 2 diameter length of engagement is adequate. For critical applications or limited engagement areas, it is important that the items discussed above be reviewed closely.

For further technical assistance, please contact the Applications Engineering Group.

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