S-91253A347 3/8"-16 x 1 1/8" 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 under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
• Full threading along the entire 1 1/8" length offers maximum grip and adjustability in various material thicknesses.
• Standard 82° countersink angle allows for a flush, professional finish that minimizes protrusion and snagging hazards.
• Hex drive design with 7/32" drive size enables high-torque installation and removal with common tools, speeding up assembly processes.
• Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to rigorous safety and environmental standards for global supply chain compatibility.

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head hex drive screws are engineered to address critical challenges in heavy machinery, automotive, and structural applications where vibration resistance and long-term durability are paramount. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, provides excellent wear resistance and prevents seizing in high-load scenarios. The coarse UNC thread and Class 3A fit ensure rapid installation and reliable clamping force, reducing assembly time while maintaining joint integrity. Ideal for countersunk holes in metal frames, equipment panels, and fixtures, these screws deliver consistent performance in environments exposed to mechanical stress and moderate corrosion.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with a Class 3A thread fit for precision alignment and strength. Manufactured to ASTM F835 specifications, it includes a standard 82° countersink angle and is fully threaded for uniform load distribution. The product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial use.