39055 ⎘
Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling Rolling locking screws
Metric self-tapping locking screw and the manufacturing method thereof
#2Screw thread structure for preventing being pulled out and tool for manufacturing same
#3Anti-loosen Screw Manufacturing Method and Screw Member Produced Thereby
#4Anti-loose screw and a die device for forming same
#5Compound die for dual thread forming