Tightening Test of Plastics Parts by Tapping Screws
Details
Tapping torque, tightening torque and tightening force in the tightening of tapping screw are measured in consideration of the hole size for threading, the length of engagement and the condition of lubrication for the purpose of the optimum design of the joint with tapping screw. The results of these tests are compared with the theory proposed by G.W.Ehrenstein and et al.. As the result it is clarified that the tapping torque can be predicted fairy well, while the tightening torque and tightening force don't agree with these measurement, especially in case of large hole size.
