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Ruspert Hex Flange Head Pointed Cut Tail Bi-metal Self Drilling Screws EPDM Washer

Ruspert Hex Flange Head Pointed Cut Tail Bi-metal Self Drilling Screws EPDM Washer

Production Processes

The point of production are made by two different metals. The detailed processes are outlined below.

Process TypeKey StepsDescription & Purpose
Welding-Based Process1. Prepare shank (SS304/316) and drill portion (carbon/low-carbon alloy steel)
2. Weld two parts
3. Cut welding burr & form threads
4. Heat treatment (quenching)		Joins corrosion-resistant austenitic stainless steel body with a hard, drill-quality steel tip. The drill portion undergoes carburization for maximum hardness.
Integrated Process (for non-bi-metal)1. Cold Forging
2. Thread Rolling (3 stages)
3. Heat Treatment (HV450+)
4. Surface Treatment		Used for standard stainless steel self-drilling screws; involves cold heading, multi-stage thread rolling, and heat treatment to achieve high hardness.

Application Scenarios

SS304 and SS316 stainless steel hex flange head self-drilling screws are designed for demanding environments due to their corrosion resistance and self-drilling capability.

  • Construction & Building: Fastening thin steel purlins in (steel structure factories), connecting light gauge steel (dragon bones/light steel frames) with OSB panels, and installing highway sound barriers. This design can maintain inalterable in high wind pressures .

  • The Hardware Fixing: The bi-metal design is suitable for fixing in hard materials, including polycarbonate sheets. The stainless steel pole maintain durability in harsh conditions.

  • Supply in other Fields:  not only for construction, 316L stainless steel self-drilling screws are also used in watercraft applications, such as  fixation the panel with screw, indicating a high standard of corrosion resistance.

How to Inquire About Free Samples

While the search results confirm that samples are available from some manufacturers, specific delivery terms are not provided. Here’s how you can proceed:

  • Check Supplier Websites: Some manufacturers, like the one on Alibaba, explicitly list a sample price (e.g., US$0.01) but state that you should contact them for further service. This indicates that sample policies are customizable.

  • Contact Suppliers Directly: Use the "Contact Supplier" feature on B2B platforms like Alibaba or Made-in-China. Clearly state your request for free samples, providing your intended application and required specifications (e.g., M6.3, 45mm length).

  • Confirm Logistics: Once a supplier agrees to provide a sample, clarify the free delivery timeline. One search result mentioned a general delivery time of 5-15 days, but this can vary.



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