S-91253A740 1/2"-13 x 6" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior tensile strength of 130,000 psi ensures reliable performance in high-stress applications
• Precise Class 3A thread fit provides secure, vibration-resistant connections
• Hex drive design with 5/16" drive size allows for high-torque installation and easy maintenance
• Partially threaded shank enables optimal clamping force distribution
• 82° countersink angle ensures flush mounting for clean, professional finishes
• Rockwell C39 hardness rating delivers outstanding durability and wear resistance

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw with black-oxide alloy steel construction addresses critical industrial fastening challenges. The coarse thread spacing and Class 3A thread fit provide superior resistance to vibration loosening in heavy machinery, construction equipment, and structural assemblies. The hex drive configuration enables high-torque installation without cam-out issues, while the partially threaded design concentrates clamping force precisely where needed. The black-oxide surface treatment offers enhanced corrosion protection, making these industrial screws suitable for outdoor applications and environments with moderate chemical exposure. With a 6" length and flat head profile, they're engineered for applications requiring flush mounting in metal frameworks, machinery bases, and structural steel connections.

Specification Summary & Compliance

This fastener maintains Class 3A thread fit tolerance per UNC standards with 1/2"-13 coarse thread spacing. Manufacturing complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.