S-91870A741 10-32 x 3/4" ASME B18.3 Tamper-Resistant Torx Plus Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with Torx Plus IPR25 drive prevents unauthorized access in high-security applications
• Exceptional corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
• Precise thread engagement with Class 3A fit ensures reliable fastening in critical assemblies
• Maximum strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness
• Full threading design provides complete engagement along the entire 3/4" length for superior holding power
• Standard flat head profile with 82° countersink angle enables flush mounting in various applications
• Comprehensive compliance with ASME B18.3, RoHS 3, and REACH standards for quality assurance

Professional Applications & Engineering Value

This 10-32 UNF flat head screw delivers exceptional engineering value in demanding industrial environments where security and reliability are paramount. The combination of 18-8 stainless steel material and passivated finish provides outstanding corrosion resistance, making it ideal for harsh conditions including outdoor equipment, marine applications, and chemical processing facilities. The tamper-resistant Torx Plus drive (IPR25) addresses critical security concerns in public infrastructure, electronic enclosures, and access control systems where unauthorized tampering must be prevented. With its Class 3A thread fit and fine thread spacing, this fastener ensures precise alignment and vibration resistance in machinery, automotive assemblies, and precision instruments. The fully threaded design maximizes load distribution, while the standardized flat head profile allows for seamless integration in countersunk applications requiring smooth surface finishes.

Specification Summary & Compliance

This high-performance flat head security screw features precise Class 3A thread fit with 10-32 UNF fine threading and right-hand direction. Manufacturing specifications strictly adhere to ASME B18.3 standards for dimensional accuracy and performance reliability. The fastener maintains compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and meets REACH (EC 1907/2006) requirements for chemical safety. Critical dimensions include 0.411" head diameter, 0.127" head height, and 3/4" overall length with standard 82° countersink angle. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures long-term durability in demanding fastening applications.