S-91236A640 3/8"-16 x 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 vibration
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Class 2A thread fit offers consistent, easy assembly while maintaining secure fastening
• External hex drive design allows for high-torque installation with standard tools
• Partial threading enables precise clamping force control for various material thicknesses
• Compliance with major regulations including RoHS 3 and REACH ensures environmental and safety standards are met

Professional Applications & Engineering Value

These 3/8"-16 UNC hex head screws deliver exceptional engineering value in demanding applications where corrosion resistance and structural integrity are paramount. The zinc plated steel construction provides reliable protection against environmental factors, while the coarse UNC thread design ensures rapid installation and superior holding power in wood, metal, and composite materials. With partial threading and external hex drive, these screws offer precise clamping control and high-torque capability for machinery assembly, structural framing, and heavy equipment maintenance. The combination of 60,000 psi tensile strength and Rockwell B69 hardness makes them ideal for applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 and ASTM A307 specifications with Class 2A thread fit tolerance for consistent performance. Features 3/8"-16 UNC coarse threads with right-hand direction and 1" minimum thread length on a 4" overall length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.