S-91255A028 10-32 x 1 1/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant fastening in critical applications
• High tensile strength of 120,000 psi provides maximum load-bearing capacity for heavy-duty assemblies
• Rockwell C39 hardness rating delivers excellent wear resistance and durability under repeated use
• Hex drive design enables secure tool engagement and high torque application without cam-out
• Fully threaded construction allows for maximum grip length and uniform stress distribution
• Regulatory compliance meets ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

These 10-32 UNF Class 3A rounded head screws deliver exceptional engineering value in precision assemblies where vibration resistance and reliable fastening are critical. The black-oxide alloy steel construction provides superior corrosion protection for industrial equipment, machinery, and automotive applications exposed to harsh environments. The fine thread spacing and Class 3A thread fit ensure precise engagement in tapped holes, preventing loosening under dynamic loads. The button head profile with hex drive offers a low-profile installation ideal for confined spaces while maintaining high torque capability. These fully threaded screws distribute clamping force evenly across the entire length, making them perfect for securing components in electronic enclosures, precision instruments, and mechanical assemblies requiring consistent, reliable performance.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread tolerance for superior fit and precision. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features UNF fine threads with right-hand direction, 1-1/8" length, and black-oxide surface treatment for enhanced durability and corrosion resistance in industrial applications.