| 摘要 |
PROBLEM TO BE SOLVED: To provide a threaded fastener capable of smoothly tightening and removing.SOLUTION: An external thread is a threaded fastener including a chamfer having a seating face and a cylindrical shank connected to the chamfer, and amorphous carbon film is formed on at least one of the seating face or the shank. An internal thread is a threaded fastener including a cylindrical member in which a hole is extended from a front end to a rear end, and amorphous carbon film is at least partially formed on the threaded fastener formed on the inner periphery surrounding the hole. |
