S-91253A346 3/8"-16 x 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating that protects against rust and extends service life in demanding environments
• Superior load-bearing capability with 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
• Flush mounting design featuring an 82° countersink angle and undercut flat head for seamless surface integration
• High-torque installation enabled by 7/32" hex drive that prevents stripping during assembly
• Full thread coverage along the 3/8" length provides maximum grip strength in various material thicknesses
• Regulatory compliance assurance meeting ASTM F835 specifications while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

These black-oxide alloy steel flat head screws deliver critical performance where surface flushness and high strength are paramount. The undercut flat head profile combined with the 82° countersink angle creates optimal clamping force while maintaining a smooth surface finish, eliminating protrusions in machinery, automotive, and structural applications. The Class 3A thread fit with UNC coarse threading ensures rapid assembly and superior vibration resistance, while the fully threaded design provides consistent holding power across varying material depths. Engineered with 130,000 psi tensile strength and corrosion-resistant black-oxide treatment, these screws withstand extreme mechanical stress and environmental exposure, making them ideal for heavy equipment, industrial machinery, and infrastructure projects requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread profile (3/8"-16). Complies with ASTM F835 specifications for mechanical properties and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features include 82° countersink angle, 7/32" hex drive, and full threading along the 3/8" length with Rockwell C39 hardness verification.