S-91255A132 5-44 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior thread engagement with Class 3A fit and UNF fine threading for vibration-resistant, leak-proof connections
• High tensile strength (120,000 psi) and Rockwell C39 hardness for reliable performance under heavy loads
• Easy installation and removal with 5/64" hex drive and rounded button head design
• Full threading ensures maximum grip length and uniform stress distribution
• Compliance with major standards including ASME B18.3 and ASTM F835 for guaranteed interchangeability
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance

Professional Applications & Engineering Value

These 5-44 UNF Class 3A Rounded Head Screws deliver precision fastening for demanding applications in machinery, electronics, and automotive assemblies. The Black-Oxide Alloy Steel construction provides excellent resistance to corrosion and wear, while the fine thread design prevents loosening under vibration. The combination of 120,000 psi tensile strength and fully threaded shank ensures secure, long-lasting joints in high-stress environments. The button head with 5/64" hex drive offers a low-profile, flush finish and easy access in confined spaces, making them ideal for precision equipment where reliability and aesthetics matter.

Specification Summary & Compliance

This screw features a 5-44 UNF fine thread with Class 3A fit for high precision and consistent engagement. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial use.