S-91253A712 1/2"-13 x 1" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads
• Precision Class 3A thread fit provides secure, vibration-resistant fastening in critical applications
• Hex drive design allows for high-torque installation without cam-out issues
• 82° countersink angle enables flush mounting for clean, professional finishes
• Full threading along the entire 1" length maximizes grip and load distribution
• Hardened alloy steel construction (Rockwell C39) delivers long-term durability and wear resistance

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head hex drive screws are engineered to solve critical fastening challenges in demanding industrial applications. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 130,000 psi tensile strength required for heavy machinery, structural assemblies, and equipment manufacturing. The Class 3A thread fit ensures precise engagement in tapped holes, reducing the risk of vibration-induced loosening in automotive, aerospace, and construction applications. The combination of hex drive design and 82° countersink allows for both high-torque installation and seamless surface integration, making these screws ideal for applications where both structural integrity and aesthetic finish are paramount.

Specification Summary & Compliance

This flat head screw features 1/2"-13 UNC coarse threads with Class 3A precision fit and full threading along the 1" length. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.