S-91309A880 7/8"-9 x 2" 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 in heavy-duty applications
• Class 2A thread fit provides consistent, smooth assembly and reduces cross-threading risks
• Coarse UNC threading enables faster installation and better performance in softer materials
• Full threading along the 2" length offers maximum grip and adjustability in various material thicknesses
• External hex drive design allows for high-torque installation with standard tools
• Rockwell B69 hardness maintains thread integrity and prevents stripping under repeated use

Professional Applications & Engineering Value

These 7/8"-9 UNC hex head screws deliver exceptional engineering value for structural applications requiring high-strength steel fastening solutions. The zinc plated finish provides critical corrosion protection in industrial settings where moisture and environmental factors threaten fastener integrity. The coarse thread design (UNC) combined with Class 2A thread fit ensures rapid assembly while maintaining precise tolerances, significantly reducing installation time in production environments. Fully threaded along the entire 2" length, these external hex drive screws offer superior clamping force distribution across joints in heavy machinery, structural steel connections, and industrial equipment where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit standards with UNC coarse threading (7/8"-9 thread size). These hex head screws comply with ASME B18.2.1 dimensional specifications and ASTM A307 material standards. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across global industrial markets.