S-91253A349 3/8"-16 x 1 5/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel for extended service life in demanding environments
• Exceptional load-bearing capability with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring reliable, vibration-resistant connections
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency through 7/32" hex drive design providing secure tool engagement and torque transmission
• Full-threaded reliability along the entire 1 5/8" length for maximum grip and load distribution
• Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical performance advantages in industrial assembly where flush surface requirements meet high-strength demands. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the 130,000 psi tensile strength needed for structural applications. The Class 3A thread fit ensures precise mating with components, reducing the risk of vibration-induced loosening in machinery, automotive, and heavy equipment. The 82° countersink angle allows perfect seating in standard chamfered holes, while the hex drive facilitates efficient installation in confined spaces. These fully threaded screws offer consistent clamping force across the entire 1 5/8" length, making them ideal for applications requiring uniform stress distribution and reliable fastening in demanding industrial environments.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing for optimal engagement. The flat head profile features standard dimensions with 0.781" head diameter and 82° countersink angle. These screws comply with ASTM F835 specifications for mechanical properties and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both performance reliability and regulatory compliance for industrial applications.