S-91253A720 1/2"-13 x 2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from black-oxide coating, extending service life in harsh industrial environments
• Superior load-bearing capacity with 130,000 PSI tensile strength for heavy-duty applications
• Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
• Optimized hex drive engagement with 5/16" drive size prevents stripping during high-torque installation
• Full threading along 2" length provides maximum grip depth and adjustment flexibility
• Enhanced material durability through Rockwell C39 hardness for repeated use without deformation
• Regulatory compliance assurance meeting ASME, ASTM, RoHS 3 and REACH standards for global projects

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws solve critical fastening challenges in heavy machinery, structural steel frameworks, and industrial equipment assemblies. The 1/2"-13 UNC coarse thread configuration combined with Class 3A precision threading prevents loosening under dynamic loads and vibration, while the 82° countersink angle creates flush surface finishes in demanding applications. Engineered with fully threaded design and hex drive compatibility, they deliver reliable performance in corrosive environments where standard fasteners would degrade, making them ideal for manufacturing plants, construction projects, and automotive applications requiring high-strength corrosion resistant solutions.

Specification Summary & Compliance

Manufactured to exact Class 3A thread fit tolerances with UNC coarse threading (1/2"-13) and right-hand thread direction. Complies with ASME B18.3 dimensional standards and ASTM F835 material specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for hazardous substance restrictions.