The locking method 30 threads, three points locking. For this type is standard product of our company, the excellent design for locking can make the threads of fixed copper completely mesh with the counter-threads and lead to a perfect effect of let-off. What more is the design of 30 that reduces the torque which is effected by tightening screw.

Material Composition: SCM440(42CrMo4)
Thread Precision: ISO 4H
Edge Bevel: 0.002mm
Hardness: HRC28 ~32
Parallelism: 0.002mm
Concenticity: 0.005m.