S-91274A364 3/8"-16 x 5 1/2" 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 the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity and reduced loosening.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
• Partially threaded design allows for controlled clamping force and easier alignment in precision assemblies.
• Standard hex drive compatibility enables quick installation and removal with common tools, boosting efficiency on the production line.
• Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability, ensuring reliable sourcing for B2B procurement.

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 protection against corrosion and chemical exposure, making it ideal for machinery, automotive, and outdoor equipment where environmental durability is paramount. The coarse thread spacing and Class 3A thread fit ensure rapid assembly with high resistance to vibration loosening, reducing downtime in high-cycle applications. With a partially threaded shank, it offers precise clamping control in jigs, fixtures, and structural frames, preventing over-torque and material damage. These features combine to deliver a reliable industrial socket screw solution that enhances operational safety and longevity in heavy-duty fastening systems.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC thread with Class 3A precision fit and coarse thread spacing, ensuring dimensional accuracy per ASME B18.3 and material standards per ASTM A574. It is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance adherence for global industrial use.