S-91236A568 1/4"-20 x 7" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding 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
• UNC coarse threading with Class 2A fit offers faster assembly and better debris resistance
• Partial threading design allows for precise clamping force control in structural applications
• External hex drive enables high-torque installation with standard tools
• 7-inch length accommodates thick materials and deep penetration requirements

Professional Applications & Engineering Value

This 1/4"-20 x 7" steel hex head screw delivers exceptional engineering value for industrial applications where reliability is paramount. The zinc plating provides crucial corrosion protection in manufacturing facilities, outdoor equipment, and structural assemblies. The UNC coarse thread design ensures rapid installation and superior performance in materials prone to vibration loosening. With its partial threading configuration, this fastener offers precise load distribution for heavy machinery, construction frameworks, and transportation equipment. The combination of 60,000 psi tensile strength and Rockwell B69 hardness makes it ideal for applications requiring repeated disassembly and reassembly without compromising structural integrity.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 specifications with ASTM A307 material standards, this hex head screw features Class 2A thread fit for consistent dimensional accuracy. The UNC 1/4"-20 coarse thread with right-hand direction ensures compatibility with standard industrial components. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and regulatory acceptance for global industrial applications.