1. Increase the contact area between the screw and the machine.
2. Eliminate the damage to the machine surface of the spring pad when unloading the screws. The use must be a spring pad and a flat pad, the flat pad next to the machine surface, the spring pad between the flat pad and the nut.
Standard of flat pad:
Standards vary from one country to another.
1) Steel hardness grade 140HV, hardness HV140-250; hardness grade 200HV, hardness HV200-250
2) stainless steel hardness grade 140HV, hardness HV140-250; hardness grade, hardness grade 200HV, HV200-250; stainless steel group A2 and A4, F1, C1 and C4
3) According to the agreement, gaskets can be made of non-ferrous metal or other materials
4) h no more than 0.5 mm, hardness grade is HV 2, h over 0.5 mm, hardness grade HV 10. (See the original technical conditions)
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