S-91306A286 5/16"-18 x 1 3/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction for long-lasting performance in harsh industrial environments
• Superior load-bearing capacity with 120,000 psi tensile strength ensuring reliable fastening in high-stress applications
• Precision thread engagement through Class 3A UNC coarse threads providing vibration resistance and quick installation
• Optimized torque transmission via hex drive design allowing secure installation without cam-out issues
• Enhanced surface durability with Rockwell C39 hardness maintaining structural integrity under repeated stress
• Maximum thread coverage through fully threaded design ensuring consistent holding power along the entire fastener length
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these zinc-plated alloy steel rounded head hex screws deliver critical performance advantages in machinery assembly, structural frameworks, and heavy equipment manufacturing. The Class 3A UNC coarse thread configuration ensures rapid installation while maintaining superior vibration resistance, significantly reducing maintenance cycles in high-vibration environments. The combination of 120,000 psi tensile strength and Rockwell C39 hardness provides exceptional resistance to shear forces and fatigue, making these fully threaded screws ideal for applications requiring consistent clamping force distribution. The corrosion-resistant zinc plating extends service life in outdoor or chemically aggressive settings, while the hex drive design enables high-torque installation without stripping, streamlining assembly processes in industrial production lines.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance ensuring consistent engagement. Complies with ASME B18.3 and ASTM F835 manufacturing specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for restricted substances, ensuring environmental regulatory adherence for industrial distribution and use. Thread specifications conform to UNC coarse thread standards with 5/16"-18 threading and right-hand orientation for universal compatibility.