S-91870A739 10-32 x 1/2" ASME B18.3 Tamper-Resistant Torx Plus Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with the specialized Torx Plus IPR25 drive, deterring unauthorized access in public or high-security installations.
• Superior corrosion resistance thanks to the 18-8 Stainless Steel material and passivated finish, ensuring long-term reliability in harsh or outdoor environments.
• High mechanical strength with a tensile strength of 70,000 psi and Rockwell B70 hardness, providing dependable performance under heavy loads and vibration.
• Precise and secure thread engagement due to the Class 3A thread fit and 10-32 UNF fine thread, minimizing the risk of stripping and ensuring a tight, reliable connection.
• Flush and low-profile installation with the standard flat head and 82° countersink angle, ideal for applications where a smooth surface finish is critical.
• Full threading along the 1/2" length offers maximum grip and adjustability, accommodating a wider range of material thicknesses.
• Compliance with major industry standards including ASME B18.3, RoHS, and REACH, guaranteeing quality, safety, and environmental responsibility for your projects.

Professional Applications & Engineering Value

This 10-32 UNF flat head screw is engineered to address critical challenges in industrial and security-focused applications. The 18-8 Stainless Steel construction, combined with a passivated finish, provides exceptional resistance to rust and corrosion, making it suitable for use in demanding environments such as marine, chemical processing, and outdoor infrastructure. The tamper-resistant Torx Plus drive (IPR25) is a key feature for preventing vandalism and unauthorized disassembly in public fixtures, electronic enclosures, and machinery access panels. Its fine UNF thread and Class 3A fit ensure a precise, vibration-resistant connection that maintains integrity in dynamic or high-stress assemblies. The flat head design allows for a seamless finish, which is essential in applications like automotive trim, aerospace interiors, and consumer electronics where aesthetics and safety are paramount. This screw delivers reliable, long-lasting performance where security and durability are non-negotiable.

Specification Summary & Compliance

This screw adheres to precise dimensional and performance criteria, including a Class 3A thread fit for high precision in Unified National Fine (UNF) threading. It is manufactured in compliance with the ASME B18.3 standard, ensuring consistent quality and interchangeability. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances. The passivated finish on the 18-8 Stainless Steel enhances its corrosion resistance without compromising the material's inherent properties.