S-91253A710 1/2"-13 x 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 PSI for reliable performance in demanding applications
• Superior corrosion resistance with black-oxide coating on alloy steel for extended service life
• Precise Class 3A thread fit ensures secure fastening and vibration resistance
• 82° countersink angle provides flush mounting and clean aesthetic finish
• 5/16" hex drive enables high-torque installation without cam-out issues
• Coarse UNC threading allows for quick assembly and disassembly in industrial settings
• Full threading along the 3/4" length maximizes grip and load distribution

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver critical performance advantages for industrial assembly and machinery applications. The combination of 130,000 PSI tensile strength and Rockwell C39 hardness ensures reliable fastening under extreme loads and vibration, while the 82° countersink angle creates seamless flush mounting in precision components. The Class 3A UNC coarse threads provide superior engagement in both metals and engineered materials, reducing installation time without compromising joint integrity. The 5/16" hex drive accommodates high-torque applications common in manufacturing equipment, automotive assemblies, and structural frameworks where fully threaded fasteners are essential for uniform stress distribution.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse thread spacing (1/2"-13). Complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features standard right-hand threading and complete 3/4" length with consistent 0.5" thread diameter throughout.