S-91236A918 1"-8 x 3 1/2" 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 under heavy loads and vibration
• Coarse UNC threads provide faster installation and reduced risk of cross-threading in structural applications
• Class 2A thread fit guarantees consistent engagement and proper assembly alignment
• External hex drive design allows for high-torque installation using standard tools
• Partial threading optimizes clamping force distribution for secure joint integrity
• Rockwell B69 hardness maintains thread form and drive integrity through repeated use

Professional Applications & Engineering Value

This 1"-8 UNC hex head screw delivers critical engineering solutions for heavy-duty assembly challenges. The Grade 2 steel construction combined with zinc plating creates a durable barrier against corrosion in manufacturing facilities, construction sites, and outdoor equipment. The coarse thread profile excels in applications involving wood, castings, and structural steel where rapid assembly and disassembly are required. With partial threading and 3½" length, this fastener provides optimal stress distribution across joined materials while the external hex drive accommodates high installation torque without stripping. These features make it ideal for machinery bases, structural frameworks, and industrial equipment requiring ASME B18.2.1 compliance and reliable long-term performance.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC thread form ensuring interchangeability. This product meets ASME B18.2.1 specifications with material certification to ASTM A307. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming restricted substance compliance for global industrial applications.