Screw Thread Insert taps produce an oversize threaded hole to accept an insert with standard size threads. Spiral Point Screw Thread Insert taps produce an oversize threaded hole that will accommodate a precision formed screw thread coil of a standard diameter and pitch. Hand taps are a general purpose tap for hand or machine tapping. These taps are identified as the size of the internal thread dimensions of the threaded insert.
General-purpose tap for hand or production machines
Oversize taps that produce threads that will accommodate a helical screw thread insert