S-91263A595 3/8"-16 x 2 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, ideal for harsh industrial environments
• Superior load-bearing capacity from 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency using 7/32" hex drive for secure tool grip and reduced slipping during torque application
• Regulatory peace of mind with full compliance to ASTM F835, RoHS 3, and REACH standards for safe global usage
• Versatile partial threading on 2 1/2" length allows controlled clamping force in multi-material assemblies

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical performance in demanding sectors like heavy machinery, structural steel framing, and automotive subassemblies. The zinc-plated alloy steel base material combats oxidative degradation in humid or chemically exposed settings, while the Class 3A thread fit maintains clamping force under dynamic loads. Engineers specify these partially threaded fasteners for applications requiring precise grip range control, such as sandwich panel constructions or equipment bases. The 82° countersink and flat head profile prevent snagging hazards in conveyor systems or public infrastructure. With ASTM F835 compliance, these screws eliminate premature failure risks in vibration-intensive environments.

Specification Summary & Compliance

Manufactured to Class 3A thread fit tolerances per UNC coarse thread standards with a minimum thread length of 1-1/2" on overall 2-1/2" dimension. Fully conforms to ASTM F835 mechanical properties, RoHS 3 (2015/863/EU) hazardous substance restrictions, and REACH (EC 1907/2006) SVHC compliance as of January 2023. The zinc plating surface treatment provides consistent corrosion protection while maintaining 130,000 psi tensile strength and Rockwell C39 hardness specifications.