High-strength screw

Application Number: 00107699
Application Date: 2000.05.19
Publication Number: 1274812
Publication Date: 2000.11.29
Priority Information: 1999/5/21 JP 141272/99; 1999/10/12 JP 289294/99; 1999/12/28 JP 375677/99
International: F16B25/00;F16B33/06
Applicant(s) Name: Okami Koshi
Inventor(s) Name: Okami Koshi
Patent Agency Code: 72002
Patent Agent: huang jianfeng
Abstract An object is to provide a high strength screw in which a high strength steel material not used in the prior art is employed as the tapping screw or gib-head screw or bolt or the like, which is formed from a material which comprises a high tensile steel, and a surface hardening process, in particular a continuous quenching gas carburization process, is performed on, at least, the thread part to form a surface hardened layer of a depth in the range of 0.05 to 0.3mm.