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Steel wire spiral sets of bottom hole how to choose the size Mar 07, 2016

Wire installation process, a screw steel wire processing base hole size should consider a screw holes and hole depth and other issues. Before tapping screw thread bottom hole diameter should be able to make after tapping screw thread diameter comply with the provisions of the installation of steel wire spiral form of minor diameter of thread.

Install the steel wire before a screw steel wire spiral sets of bottom hole processing

The choice of steel wire spiral sets of bottom hole aperture

Before tapping screw thread sheath base hole diameter should be able to make the attack after the minor diameter of thread comply with the provisions of the installation of steel wire spiral form of minor diameter of thread (or GJB119.3 HB5515-96-96)

Choose screw sheath base hole drill bit diameter should be considered when different materials when drilling and tapping could produce production.

In the absence of standard data can also refer to the following and try to calculate select bit diameter

Wire D a screw drill = D + p (0.25 0.3)

Wire D - a screw thread nominal diameter

Wire P - a screw pitch