S-91255A822 5-40 x 3/4" 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
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads
• Precision Class 3A thread fit provides secure, vibration-resistant fastening
• Fully threaded coarse UNC design enables faster installation and superior holding power
• 5/64" hex drive with rounded button head offers clean aesthetics and tool accessibility
• Rockwell C39 hardness rating guarantees long-term durability and wear resistance
• Compliance with ASME B18.3 and ASTM F835 ensures consistent quality and engineering reliability

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 5-40 UNC rounded head hex screws deliver superior performance in machinery assembly, automotive components, and heavy equipment. The black-oxide alloy steel construction provides excellent corrosion protection, extending service life in challenging environments. The fully threaded coarse spacing design ensures rapid installation and maximum thread engagement, reducing assembly time while maintaining joint integrity. With Class 3A thread fit precision, these screws prevent loosening under vibration, making them ideal for dynamic load applications. The combination of 120,000 psi tensile strength and Rockwell C39 hardness provides reliable fastening in high-stress applications where fastener failure is not an option.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 standards with Class 3A thread fit precision. Features 5-40 UNC coarse threads with right-hand orientation and 3/4" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.