Screws having selected heat treatment and hardening

Details Screws having selected heat treatment and hardening Screws having selected heat treatment and hardening

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01) B21H 3/02 (2006.01) C21D 9/00 (2006.01) F16B 35/00 (2006.01)

Patent

CA 2291577

A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied using a driving tool. In another embodiment, the screw tip is selectively hardened for more effective penetration into a substrate. Preferably, the selectively heated portions are selectively quenched to reduce or avoid distortion.

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