S-91309A851 3/4"-10 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 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 deformation
• Coarse UNC threads with Class 2A fit enable quick installation and secure fastening in various materials
• External hex drive with 1 1/8" wide head allows for high-torque application using standard tools
• Full threading along 4" length offers maximum grip and adjustability in deep applications
• Compliance with major industry standards including ASME B18.2.1 and ASTM A307 guarantees quality and interoperability

Professional Applications & Engineering Value

This 3/4"-10 UNC hex head screw delivers exceptional engineering value for heavy-duty industrial applications where reliability is paramount. The Grade 2 steel construction combined with zinc plating provides critical corrosion protection in manufacturing plants, construction sites, and machinery assembly. The coarse thread design ensures superior holding power in softer materials and faster installation times, while the external hex drive accommodates high torque requirements without stripping. With full threading along its 4-inch length, this fastener offers maximum engagement depth for structural connections, equipment mounting, and framework assembly where vibration resistance and long-term stability are essential.

Specification Summary & Compliance

This hex head screw features Class 2A thread fit per UNC standards, ensuring proper clearance and interchangeability. Manufacturing complies with ASME B18.2.1 dimensional specifications and ASTM A307 material requirements. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for industrial fasteners.