Helicoil Chart

Helicoil Chart. The minimum drilling depths shown below allow for the following recommended practices: Helicoil inserts are diametrically larger than the tapped hole.

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This type of tap has only 1 to 2 pitch thread chamfer. Helicoil tap drill chart and calculator: An sti drill chart will inform you on the proper size drill to use in conjunction with an sti tap.