S-91309A718 1/2"-13 x 1 3/4" 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
• Coarse UNC threading enables quick installation and superior grip in various materials
• External hex drive design allows for high-torque application with standard tools
• Full threading along 1 3/4" length provides maximum engagement and adjustment flexibility

Professional Applications & Engineering Value

This 1/2"-13 UNC hex head screw delivers exceptional engineering value for demanding industrial applications. The high-strength steel construction combined with zinc plating addresses common corrosion challenges in manufacturing, construction, and machinery assembly. The coarse thread design ensures reliable performance in softer materials and high-vibration environments, while the external hex drive facilitates efficient installation with standard wrenches. With full threading across its entire length, this fastener provides maximum clamping force distribution, making it ideal for structural connections, equipment mounting, and heavy-duty assemblies where 60,000 PSI tensile strength is critical for long-term reliability.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with UNC coarse threading (1/2"-13) and right-hand thread direction. Manufactured to ASME B18.2.1 specifications and ASTM A307 standards, it ensures dimensional accuracy and mechanical performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry requirements for hazardous substance restrictions.