Helicoil Tapping Chart

The minimum tapping depths shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 pitch maximum. The calculation for Dimension “H” is: H is equal to insert nominal length +1 Pitch.

The tapped hole must be held within the stated pitch diameter limits for the required class of fit for the installed Heli-Coil insert. When anodize, Iridite or other finishes are used, all tapped hole dimensions must be met after the finishes are applied.

Helicoil Tapping Data - Metric

Heli-Coil taps in various types and styles produce holes for Tolerance Classes 4H5H or 3B and 5H or 2B for use in the general range of aluminums, magnesiums, mild steels, free machining stainless steels and other free machining materials. Conventional shop practice and production procedures, speeds, feeds and lubricants should be used in combination with proper fixturing and good tapping machines or tapping heads. The tapped hole must be held within the stated pitch diameter limits for the required Tolerance Class of fit for the installed Heli-Coil insert. For Standard (free running inserts), a tolerance class 5H or 2B is recommended. For Screw- Lock inserts, a tolerance class 4H5H or 3B is recommended in order to develop higher locking torques.

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HeliCoil Technical Catalogue

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HeliCoil After Market Kits

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