Method of inserting a hole forming and selftapping screw

Details Method of inserting a hole forming and selftapping screw Method of inserting a hole forming and selftapping screw

1993-08-09

1994-11-08

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Assembling or joining

29432, 29505, B23P 1100

Patent

active

053614780

ABSTRACT:
Hole forming and selftapping screw of up to approximately 6 mm thread diameter for tapping into sheet metal of a thickness of up to approximately 1 mm comprising a head including a formation for receiving a tool, a thread shank and a cylinder member following thereon having a diameter less than the thread-pitch diameter of the thread shank, merging into a tapered hole forming member. The thread shank merges with the cylinder member via a taper extending over approximately four threads, a distance corresponding approximately to the four-fold sheet metal thickness. The hole forming member terminates in a convexly curved friction surface corresponding to a radius (R) of approximately 0.5 mm. The entire screw is formed in one piece of tempered steel having a tensile strength of up to approximately 1400 N/mm.sup.2, mechanically hardened steel respectively.

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Bostitch ASN-1, Pneumatic Screw-Nailer for Lightweight Steel Framing, 2 pps, 1988, Stanley-Bostitch, Inc., East Greenwich, R.I. 02818.

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