Why must threads be lubricated?

1. Easier assembly
2. Avoiding of the cold welding effect (stainless steel or alloy fasteners)
3. Reduction of the mean variation of the coefficients of friction (enables
    automatic assembly)
4. Enables definite coefficients of friction (calculations of screw
    connections)
5. Enables the loosening of screws for hot temperature applications

Deviation of friction for uncoated screws    Deviation of friction for GLEITMO HMP Film coated screws
Deviation of friction for uncoated screws    Deviation of friction for GLEITMO®
HMP Film coated screws