S-91253A636 3/8"-16 x 3" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh conditions.
• Partially threaded design with UNC coarse thread allows for faster installation and improved grip in softer materials, increasing assembly efficiency.
• 82° countersink angle and flat head profile enable a flush, low-profile finish that minimizes protrusion and enhances safety in machinery.
• Hex drive (7/32") ensures easy installation and removal with standard tools, reducing labor time and improving maintenance accessibility.
• Rockwell C39 hardness provides excellent wear resistance, maintaining thread integrity and performance over repeated use.

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws are engineered to address critical fastening challenges in industrial settings, such as machinery assembly, automotive components, and structural frameworks. The black-oxide alloy steel construction combats corrosion and wear, while the Class 3A thread fit ensures precise engagement, reducing loosening under vibration. The partially threaded coarse UNC design accelerates installation in materials like aluminum or plastic, and the 82° countersink angle allows for seamless integration into angled surfaces, preventing snagging and improving aerodynamic profiles. Ideal for applications requiring high-strength, reliable fasteners that meet rigorous industry standards, these screws deliver consistent performance in heavy-duty environments.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for precise UNC coarse threading, with dimensions including a 3" length and 1 3/8" minimum thread length. It complies with ASME B18.3 and ASTM F835 specifications, ensuring manufacturing consistency and reliability. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, supporting safe and sustainable industrial use.