This product is made of SCM435 alloy steel, cold heading + twisted wire, after 12.9 grade hardening treatment, machining tolerance +/-0.05.

SCM435 has high static strength, impact toughness and higher fatigue limit, higher hardenability than 40Cr, high creep strength and lasting strength under high temperature, long-term working temperature up to 500℃;
Cold deformation of medium plasticity, poor weldability.
Important structural parts for work under high load, such as vehicle and engine transmission parts;
Turbo generator rotor, spindle, heavy load transmission shaft, large section parts.

The surface is environmentally friendly black zinc, salt spray up to 144H above no red rust.

Tiansheng has been producing fasteners professionally for 12 years. Welcome to customize your own products.