S-91236A636 3/8"-16 x 3" 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 demanding industrial environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Coarse UNC threads with Class 2A fit enable faster assembly and better debris resistance
• External hex drive design allows for high-torque installation with standard tools
• Partial threading offers optimal grip strength while reducing material costs
• Compliance with major industry standards including ASME B18.2.1 and ASTM A307 for guaranteed quality

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw delivers exceptional engineering value for industrial fastening applications where reliability is paramount. The steel construction with zinc plating provides robust corrosion protection, making it ideal for outdoor equipment, machinery assembly, and structural applications exposed to environmental elements. The coarse thread design ensures quick installation and superior performance in materials where fine threads might strip or fail. With its external hex drive and partially threaded configuration, this fastener offers optimal clamping force distribution while accommodating standard wrench sizes. The combination of 60,000 psi tensile strength and Rockwell B69 hardness makes it particularly suitable for heavy-duty applications in construction, manufacturing, and equipment maintenance where vibration resistance and long-term reliability are critical requirements.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit tolerance for consistent performance and meets ASME B18.2.1 manufacturing specifications with ASTM A307 steel material standards. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial sectors. Key dimensional specifications include 3/8"-16 UNC coarse threads, 3" overall length with 1" minimum thread length, and head dimensions of 1/4" height and 9/16" width for standardized tool compatibility.