Grade 12.9 is the top grade in the screw. It has high hardness and tensile strength. Its Rockwell hardness (HRC) can reach between 39-44 and the tensile strength can reach 1220N/mm2, but the shape of the screw is different. Therefore, the countersunk head hexagonal screws (flat cups) and the semi-circular head hexagonal screws (round cups) made of the same material can only achieve the minimum tensile strength of 10.9. It can also fully meet the high requirements of fasteners for special occasions and components of industrial and mining enterprises.

 Features:

1. Highest Strength in screw world;

2.Easy to maintain and not easy to Slipping;

3.Anti rustic,wise choice for cars always in water

4.Add bling-bling to your be loved cars

Head Type:

Hex Socket Button Head Screw

Hex Socket Flat Head Screw

Hexagonal Cup Head Screw