S-91870A748 1/4"-20 x 3/8" ASME B18.3 Tamper-Resistant Torx Plus Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper-resistance with the specialized Torx Plus IPR27 drive, preventing unauthorized access in secure environments.
• Excellent corrosion resistance from 18-8 Stainless Steel and a passivated finish, ensuring long-term durability in harsh conditions.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads.
• Secure, flush installation thanks to the undercut flat head and 82° countersink angle, providing a smooth surface and reduced risk of snagging.
• Easy, reliable assembly with a fully threaded, coarse UNC thread and Class 2A fit, ensuring quick installation and consistent clamping force.
• Broad industrial compliance meeting ASME B18.3 standards, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Versatile right-hand threading designed for standard applications, offering compatibility and ease of use across various assemblies.

Professional Applications & Engineering Value

Engineered for demanding environments, these 1/4-20 UNC flat head screws address critical needs in industrial security and durability. The 18-8 Stainless Steel construction, enhanced by a passivated finish, combats corrosion in outdoor or chemically exposed settings, extending service life. The tamper-resistant Torx Plus IPR27 drive is ideal for public infrastructure, machinery, and electronic enclosures where vandalism is a concern. With a fully threaded coarse design and undercut flat head, they ensure a tight, flush fit that minimizes protrusion and prevents loosening under vibration. This combination of high tensile strength and precise threading makes them a reliable choice for assembly lines, automotive, and construction projects, reducing maintenance and replacement costs.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. Manufacturing adheres to ASME B18.3 specifications, ensuring consistent quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for industrial use.