S-91309A633 3/8"-16 x 2 1/4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibrations
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Fully threaded design allows for maximum grip and uniform stress distribution in assemblies
• Class 2A thread fit with UNC coarse threads enables quick installation and easy disassembly
• External hex drive and hex head offer secure tool engagement for efficient tightening
• Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered for demanding industrial applications where reliability is critical. The high-strength steel construction, combined with a zinc plated finish, provides robust protection against corrosion, making it ideal for outdoor machinery, construction equipment, and automotive assemblies. The coarse thread design ensures quick fastening and reduces the risk of cross-threading, while the fully threaded body offers consistent clamping force across the entire length. With a tensile strength of 60,000 psi and Rockwell B69 hardness, this screw handles high-stress conditions without failure, minimizing downtime and maintenance costs in heavy-duty operations.

Specification Summary & Compliance

This product features a 3/8"-16 UNC thread with Class 2A thread fit for standard tolerance and ease of use. It complies with ASME B18.2.1 and ASTM A307 manufacturing specifications, ensuring dimensional accuracy and performance consistency. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory standards, supporting environmentally responsible sourcing and usage in global markets.