WTI Fasteners Databooks
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Tang Break Punches

Efficient tang break-off is dependant upon several conditions

It is critical that the correct diameter of punch/tool is used

Sufficient thread must exist in the tapped hole to provide the necessary support at the tang elbow, and adequate clearance beyond the insert must be present to allow for tang deflection.

The specified limits for drilling and tapping lengths in tabulated form, that appear in the WTI data sheet, have been calculated to ensure such conditions.