S-91870A199 8-32 x 1" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with T20 Torx drive to prevent unauthorized access in secure environments.
• Exceptional corrosion resistance from 18-8 Stainless Steel and passivated finish, ensuring longevity in harsh conditions.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing applications.
• Precise thread engagement with Class 3A fit and UNC coarse threads for secure, vibration-resistant fastening.
• Flush mounting capability with standard flat head and 82° countersink angle for a smooth, professional finish.
• Full threading along the 1" length provides maximum grip and adjustment flexibility in assembled components.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use.

Professional Applications & Engineering Value

Engineered for demanding industrial and security applications, these 8-32 UNC flat head tamper-resistant Torx screws address critical needs for durability and unauthorized access prevention. The 18-8 Stainless Steel construction, enhanced by a passivated finish, resists oxidation and chemical exposure, making them ideal for outdoor equipment, electronic enclosures, and machinery in corrosive environments. The T20 drive ensures only authorized personnel can install or remove the fastener, while the Class 3A thread fit and coarse UNC threading provide tight, reliable connections that withstand vibration and stress. Fully threaded for maximum holding power, these screws deliver consistent performance in assembly lines, security panels, and precision engineering projects where tamper-proofing and material integrity are paramount.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, ensuring high tolerance and secure fastening. Manufacturing adheres to ASME B18.3 specifications for dimensional accuracy, including the 82° countersink angle and 1" length. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and restricted substance-free materials for global industrial use.