S-91263A214 1/2"-13 x 3 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction for long-lasting performance in harsh industrial environments
• Superior load-bearing capability with 130,000 psi tensile strength and Rockwell C39 hardness for demanding applications
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
• Easy installation and removal with 5/16" hex drive design providing secure tool grip and torque transmission
• Optimal flush mounting with standard 82° countersink angle for seamless surface integration
• Enhanced durability through partial threading design that concentrates strength where needed most
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This zinc-plated alloy steel flat head screw delivers critical engineering solutions for industrial applications requiring both high tensile strength and environmental resistance. The 1/2"-13 UNC coarse thread configuration provides excellent engagement in various materials, while the Class 3A thread fit ensures precise tolerances for vibration-prone environments. The 82° countersink angle allows for flush mounting in machinery, structural assemblies, and equipment where surface protrusion must be minimized. The partial threading design concentrates the screw's strength in the engagement zone, making it ideal for applications requiring both clamping force and shear resistance. The hex drive configuration enables high-torque installation in confined spaces, while the zinc plating provides essential corrosion protection for extended service life in demanding conditions.

Specification Summary & Compliance

Manufactured to inch system specifications with Class 3A thread precision for superior fit and reliability. This flat head screw complies with ASME B18.3 and ASTM F835 manufacturing standards, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety. Featuring right-hand thread direction with coarse thread spacing and 1 3/4" minimum thread length on a 3 1/2" overall length partially threaded shank.