S-91900A302 M4 x 20 mm ASTM F879M, ISO 7380 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Tamper-resistant T15 Torx drive prevents unauthorized access, enhancing security in public or controlled environments.
• 18-8 stainless steel construction offers excellent corrosion resistance, ensuring long-term reliability in harsh conditions.
• Passivated finish further boosts corrosion protection, extending service life and reducing maintenance needs.
• Fully threaded design with Class 6g fit provides consistent, reliable engagement and ease of installation in metric applications.
• High tensile strength of 80,000 psi and Rockwell B96 hardness deliver robust performance for heavy-duty industrial use.
• Compliance with ASTM F879M and ISO 7380 standards guarantees precise dimensions and reliable mechanical properties.
• RoHS 3 and REACH compliant ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This M4 metric screw with a 0.7 mm coarse pitch and 20 mm length is engineered to address critical challenges in industrial and security-focused settings. The tamper-resistant Torx drive (T15 size) deters vandalism and unauthorized disassembly, making it ideal for public infrastructure, machinery, and electronic enclosures. Constructed from 18-8 stainless steel and featuring a passivated finish, it resists corrosion from moisture, chemicals, and outdoor exposure, reducing downtime and replacement costs. The fully threaded design with Class 6g thread fit ensures secure fastening in metric applications, while high tensile strength and hardness support demanding loads. Commonly used in industrial screws for assembly lines, security panels, and heavy-duty equipment, it combines durability with regulatory compliance to streamline procurement and enhance operational safety.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 6g thread fit for metric applications, ensuring compatibility and ease of use. It meets ASTM F879M and ISO 7380 specifications for mechanical properties and design. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it is free from hazardous substances and suitable for environmentally conscious industries.