S-91253A642 3/8"-16 x 3 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments
• Exceptional tensile strength (130,000 psi) and hardness (Rockwell C39) for reliable performance in high-stress applications
• Precise Class 3A thread fit ensures secure, vibration-resistant fastening and reduces the risk of cross-threading
• 82° countersink angle allows for a flush, low-profile installation, ideal for applications requiring a smooth surface finish
• Hex drive (7/32") provides high torque transmission and easy installation with standard tools, minimizing slippage
• Partially threaded design offers optimal grip and clamping force on specific material thicknesses
• Compliance with ASTM F835, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to solve critical fastening challenges in demanding industrial settings. The black-oxide alloy steel construction provides excellent protection against rust and corrosion, making it ideal for machinery, automotive assemblies, and outdoor equipment where exposure to moisture and chemicals is common. The coarse UNC thread and Class 3A fit ensure quick, secure engagement in metals and composites, reducing assembly time and preventing loosening under vibration. With its partially threaded shank and 82° countersink, it delivers precise clamping without protruding, maintaining structural integrity and aesthetic requirements in applications like metal framing, enclosures, and heavy-duty fixtures.

Specification Summary & Compliance

This screw adheres to inch system dimensions with a 3/8"-16 UNC coarse thread and Class 3A thread fit for high precision. It is manufactured in compliance with ASTM F835 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting strict environmental and safety standards for hazardous substances.