Self-Tapping Threaded Inserts from China - Durable, Reusable Solutions by Leading Suppliers and Factory

303 Stainless Steel
Excellent corrosion resistance and machinability for general-purpose use.

316/316L Stainless Steel
Superior pitting and chloride resistance for marine, chemical, and food-processing environments.

4140 Alloy Steel, Zinc-Nickel Plated
High tensile strength and cost-effective for automotive and tooling applications.

Brass C36000
Non-sparking and non-magnetic, ideal for electrical housings and precision instruments.
All materials are heat-treated to 40–48 HRC on the external cutting zone, while the internal threads remain at 28–32 HRC to prevent galling.
Frequently Asked Questions (FAQ)
What are the primary benefits of using 303 Stainless Steel?
303 Stainless Steel offers excellent corrosion resistance combined with outstanding machinability, making it the preferred choice for general-purpose applications.
When should I choose 316/316L Stainless Steel over 303?
You should choose 316/316L Stainless Steel when your application requires superior resistance to pitting and chlorides. This makes it ideal for marine, chemical processing, and food-processing environments.
What makes Zinc-Nickel Plated 4140 Alloy Steel suitable for automotive use?
4140 Alloy Steel provides high tensile strength and is highly cost-effective. The Zinc-Nickel plating adds essential corrosion resistance, making it perfect for automotive and heavy-duty tooling applications.
What are the unique properties of Brass C36000?
Brass C36000 is non-sparking and non-magnetic. These properties make it exceptionally suited for precision instruments, electrical housings, and environments where safety is critical.
How does the heat treatment process prevent thread galling?
The materials undergo a specialized dual-zone heat treatment: the external cutting zone is hardened to 40–48 HRC for optimal cutting performance, while the internal threads are kept at a lower hardness of 28–32 HRC to prevent galling during assembly.


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