S-91253A750 1/2"-13 x 7" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance in demanding applications, preventing fastener failure under high stress
• Superior corrosion resistance from black-oxide coating extends service life in harsh industrial environments, reducing maintenance and replacement costs
• Precise Class 3A thread fit provides tighter tolerances for secure fastening with minimal vibration loosening in critical assemblies
• Partially threaded design allows for controlled clamping force distribution while maintaining full engagement in thicker materials
• 82° countersink angle enables flush mounting for clean, professional finishes in visible applications
• 5/16" hex drive delivers superior torque transmission during installation, reducing stripping and installation time
• Rockwell C39 hardness maintains thread integrity and drive features through repeated installation cycles

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws solve critical engineering challenges in heavy machinery, structural steel framing, and industrial equipment assembly. The combination of 130,000 psi tensile strength and UNC coarse threading provides exceptional load-bearing capacity while resisting vibration-induced loosening in high-stress environments. The partially threaded configuration allows for precise clamping control in layered materials, while the 82° countersink ensures seamless integration in precision-machined components. The black-oxide surface treatment offers superior corrosion protection without compromising dimensional accuracy, making these ASTM F835 compliant fasteners ideal for outdoor equipment, construction applications, and manufacturing assemblies where reliability and durability are paramount.

Specification Summary & Compliance

This 1/2"-13 x 7" flat head hex screw features precision UNC coarse threading with Class 3A thread fit for superior dimensional accuracy. Manufactured to meet ASTM F835 specifications for mechanical properties and performance standards. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. The partially threaded design provides 1-1/2" minimum thread length with controlled unthreaded shank section for optimal fastening performance.