S-91253A759 1/2"-13 x 9" 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 load-bearing capacity from 130,000 psi tensile strength and Rockwell C39 hardness
• Precise thread engagement with Class 3A fit for reliable, vibration-resistant connections
• Optimized flush mounting with 82° countersink angle and standard flat head profile
• Enhanced installation efficiency through 5/16" hex drive and coarse UNC threading
• Reduced material stress with partial threading design for controlled clamping force
• Full regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver critical performance in heavy machinery, structural steel framing, and industrial equipment assembly. The Class 3A thread fit ensures precise tolerance control for vibration-prone applications, while the partially threaded design prevents over-torquing in stacked materials. Engineers specify these 1/2"-13 UNC coarse thread fasteners for their combination of 130,000 psi tensile strength and chemical compliance, making them suitable for OEM manufacturing, construction projects, and maintenance operations requiring ASTM F835 compliant fasteners that withstand extreme mechanical stress without compromising environmental regulations.

Specification Summary & Compliance

Manufactured to exact Class 3A thread fit standards with 1/2"-13 UNC coarse threading and 82° countersink angle. Complies with ASTM F835 specifications for mechanical properties and dimensional requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental directives. Threading is partially threaded with minimum 1-1/2" thread length, right-hand direction, and 9" overall length with 5/16" hex drive.