S-91306A718 1/4"-28 x 1" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh industrial environments
• Exceptional load-bearing capability with 120,000 PSI tensile strength and Rockwell C39 hardness for high-stress applications
• Precise thread engagement with Class 3A fine thread fit ensuring vibration resistance and secure fastening
• Easy installation and removal with 5/32" hex drive providing reliable torque transmission
• Optimized head design with rounded button profile offering reduced protrusion and improved aesthetics
• Full thread coverage along the 1" length for maximum grip strength and distribution
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3 and REACH standards

Professional Applications & Engineering Value

These zinc-plated alloy steel rounded head screws deliver critical performance advantages in demanding industrial applications. The Class 3A UNF fine thread configuration provides superior vibration resistance compared to coarse threads, making them ideal for machinery, automotive assemblies, and precision equipment where loosening under dynamic loads is a concern. The fully threaded design ensures maximum engagement strength across the entire fastener length, while the hex drive compatibility allows for efficient installation in confined spaces. The combination of 120,000 PSI tensile strength and Rockwell C39 hardness provides exceptional durability against shear and tensile forces, significantly reducing failure risks in critical connections.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit tolerances with 1/4"-28 UNF fine thread specifications. Complies with ASME B18.3 and ASTM F835 manufacturing standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include: 1" length, 5/32" hex drive, 0.437" head diameter, and right-hand thread orientation.