Description
Roughing taps are available for difficult tapping operations where it is desirable to reduce the load on the finishing tap. Available only in sizes 7/16 – 1″. The minimum tapping depths shown below (Dimension H) is the MINIMUM for countersunk holes and an insert set-down of 1 – 1/2 pitch maximum. The calculation for Dimension “H” is: H = Insert Nominal Length (Q) + 1P. 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.
