Aug 99 - Screw Thread Insert Taps

When preparing a hole to accept a Heli-Coil wire screw thread insert, a Screw Thread Insert or STI tap is used to prepare the hole. The recommended drill is utilized to open the hole to the correct minor diameter. The STI tap is then used to create the proper threads in the piece.

While an STI tap does differ from a standard thread cutting tap, all accepted machining practices should be adhered to. Taps should be fixtured properly relative to the work-piece and an appropriate lubricant should always be used. Heli-Coil STI taps are available in several styles to tap into both blind and through holes in various material compositions.

As with all Heli-Coil taps, the class of fit of the final Heli-Coil assembly is determined by the class of fit of the tapped hole. Therefore, Heli-Coil STI taps are available in both 2B and 3B configurations. Heli-Coil can also work with you to develop taps for specialized materials. Our Heli-Coil Applications Engineering staff can provide you with all of the pertinent details regarding this subject.

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