S-91274A320 3/8"-16 x 1 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 and heavy-duty applications.
• Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
• High hardness (Rockwell C37) offers excellent wear resistance and durability under repeated use.
• Partially threaded design allows for optimal clamping force and easier alignment in assemblies.
• Standard hex drive (5/16") enables quick and easy installation with common tools, reducing assembly time.
• Compliance with major standards including ASME B18.3 and ASTM A574 ensures consistent quality and reliability.

Professional Applications & Engineering Value

This 3/8"-16 UNC Socket Head Cap Screw is engineered to address critical challenges in demanding industrial settings. The zinc-flake-coated alloy steel construction provides robust corrosion protection, making it ideal for machinery, automotive, and construction applications exposed to moisture and chemicals. The coarse UNC thread and Class 3A fit deliver superior grip and vibration resistance, preventing joint failure in dynamic loads. With a high tensile strength of 170,000 PSI and Rockwell C37 hardness, it withstands extreme forces and wear, reducing maintenance needs and downtime. The partially threaded shank ensures precise clamping without thread interference, streamlining assembly in tight spaces and enhancing overall structural integrity.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for precise dimensional accuracy and meets ASME B18.3 and ASTM A574 manufacturing standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.