S-91255A277 10-32 x 1 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide finish for extended service life in demanding environments
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• Exceptional 120,000 psi tensile strength provides maximum load-bearing capacity for heavy-duty applications
• Hex drive design allows for high-torque installation and secure fastening in confined spaces
• Fully threaded shank delivers consistent clamping force along the entire fastener length
• Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated use
• Rounded button head profile offers a low-profile, snag-resistant finish for improved safety

Professional Applications & Engineering Value

These 10-32 UNF Class 3A Black-Oxide Alloy Steel rounded head screws address critical engineering challenges in industrial fastening systems. The fine thread spacing and Class 3A thread fit provide superior vibration resistance in machinery, automotive, and aerospace applications where loosening under dynamic loads is a concern. The Black-Oxide surface treatment creates a protective barrier against corrosion while maintaining dimensional stability. Combined with the hex drive configuration and fully threaded design, these fasteners ensure uniform stress distribution and reliable performance in high-stress assemblies, reducing maintenance frequency and improving equipment longevity.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNF fine thread form and right-hand threading. Complies with ASME B18.3 and ASTM F835 manufacturing specifications. Meets environmental standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features 1 5/8" length with fully threaded construction and 1/8" hex drive for consistent installation performance.