S-91255A617 3/8"-16 x 3 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in demanding environments
• Superior tensile strength of 120,000 psi ensures reliable performance in high-stress applications
• Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal play
• Rockwell C39 hardness delivers excellent wear resistance and durability under repeated use
• Hex drive design allows for high-torque installation and easy maintenance access
• Fully threaded shank enables maximum grip length and uniform load distribution
• Coarse UNC threading facilitates quick assembly and disassembly in industrial applications

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws are engineered to solve critical fastening challenges in heavy machinery, construction equipment, and industrial assemblies. The combination of Class 3A UNC coarse threading and fully threaded design ensures maximum engagement strength while resisting vibration-induced loosening. The hex drive configuration provides superior torque transmission during installation, making them ideal for high-stress applications where reliability is paramount. The black-oxide surface treatment creates a protective barrier against corrosion, significantly extending service life in harsh operating conditions while maintaining the alloy steel's inherent strength characteristics.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse threading (3/8"-16) and full compliance with ASME B18.3 and ASTM F835 specifications. These screws meet stringent environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards, ensuring they're suitable for global industrial applications requiring certified components.