S-91274A300 3/8"-16 x 3/4" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc-flake coating protects against harsh industrial environments, extending service life and reducing maintenance costs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Coarse UNC threading allows for faster installation and easier alignment, improving assembly efficiency in production lines.
• Standard hex drive design with 5/16" drive size ensures compatibility with common tools, facilitating quick and secure tightening.
• Full threading along the 3/4" length provides consistent clamping force and flexibility in various joint configurations.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The UNC coarse thread and Class 3A fit deliver superior holding power in dynamic applications, from heavy machinery to automotive assemblies, where precision and durability are critical. The high tensile strength and robust hex drive design prevent stripping under high torque, ensuring reliable performance in demanding conditions. By combining advanced material properties with compliant surface treatment, this fastener reduces downtime and enhances the longevity of equipment, making it an ideal choice for OEMs and maintenance professionals seeking dependable industrial fasteners.

Specification Summary & Compliance

This socket head cap screw adheres to ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and manufacturing consistency. The Class 3A thread fit provides precise tolerances for secure fastening. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally sensitive and regulated industries. Manufactured in the inch system, it meets rigorous standards for performance and safety.