Heat-treated 12.9 Grade Bolt Units with Rubber Ring,Concave Washer and Nuts
Material Grade: 40Cr;
Quality Level: 12.9 Grade
Sizes: M24, M27,M30,M36,M42,M45;
Bolt-head Shape: oval head, square head,ellipse head;
Special Features:
1. The high strength bolts have been widely used in large ball mills up to dia.12-meter mills.
2. The high strength screws can be reliably used in small,middle and large cement mills,coal mils and mine mills.
3. The high strength bolts have been properly heat-treated to achieve better mechanical properties.
4. The standard bolt units include one rubber ring,concave washer,spring washer and nut.
