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1. (WO1984002380) A SCREW

Pub. No.:    WO/1984/002380    International Application No.:    PCT/GB1983/000304
Publication Date: Jun 21, 1984 International Filing Date: Nov 28, 1983
IPC: F16B 25/00
Title: A SCREW
A screw usable as either a wood screw or a self-tapping screw comprises a two start helical thread (12) having a helix angle of 20o or more with an included angle to the thread profile at its crest of 40o or less. The threads are raised rapidly from a conical un-threaded entry point (14) and the thread crest diameter is greater than that of the unthreaded shank portion (10) of the screw.