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Helicoil Tapping Chart: H Is Equal To Insert Nominal Length +1 Pitch

The document provides a chart with minimum tapping depths (Dimension H) for installing Helicoil inserts. Dimension H is equal to the insert's nominal length plus one pitch. The tapped hole must be within the stated pitch diameter limits for the required class of fit for the installed Helicoil insert. When finishes are applied to parts, all tapped hole dimensions must still be met.

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2K views2 pages

Helicoil Tapping Chart: H Is Equal To Insert Nominal Length +1 Pitch

The document provides a chart with minimum tapping depths (Dimension H) for installing Helicoil inserts. Dimension H is equal to the insert's nominal length plus one pitch. The tapped hole must be within the stated pitch diameter limits for the required class of fit for the installed Helicoil insert. When finishes are applied to parts, all tapped hole dimensions must still be met.

Uploaded by

Tran Nghi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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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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