S-91255A029 10-32 x 2 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance under high stress
• Precision thread engagement with Class 3A fine UNF threads ensuring secure, vibration-resistant fastening
• Easy installation and removal with hex drive design providing superior torque transmission and tool accessibility
• Full-threaded design offering maximum grip length and uniform load distribution across the entire fastener
• Rounded button head profile creating a low-profile, aesthetically clean finish while minimizing snag hazards
• Comprehensive regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global acceptance

Professional Applications & Engineering Value

These black-oxide alloy steel screws deliver exceptional performance in critical industrial applications where vibration resistance and corrosion protection are paramount. The 10-32 UNF fine thread configuration provides superior holding power in materials prone to stripping, while the Class 3A thread fit ensures precise engagement in tapped holes. The hex drive design allows for high-torque installation without cam-out issues, making them ideal for assembly lines and maintenance operations. The fully threaded construction maximizes surface contact for enhanced load distribution, particularly valuable in machinery, equipment manufacturing, and structural applications where joint integrity cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread tolerance for precision fit, these screws conform to UNF (Unified National Fine) thread standards. The manufacturing process adheres to ASME B18.3 dimensional specifications and ASTM F835 mechanical property requirements. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance, providing assurance for procurement in regulated industries and international supply chains.