S-93548A633 3/8"-16 x 2 1/4" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Exceptional anti-rotation performance thanks to the integrated square neck design that prevents spinning during installation
• High tensile strength rating of 60,000 PSI Grade 2 classification ensures reliable performance under heavy loads
• Optimized thread engagement with fully threaded UNC coarse pattern for faster installation and secure fastening
• Consistent dimensional accuracy with Class 2A thread fit for precise mating with nuts and components
• Enhanced durability with Rockwell B70 hardness rating that resists deformation under stress
• Broad compatibility with right-hand threading that matches standard industrial equipment and applications

Professional Applications & Engineering Value

These Grade 2 zinc-plated steel carriage bolts deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The square neck design mechanically locks into materials, eliminating rotation during torque application - a common failure point in dynamic load applications. With 3/8"-16 UNC coarse threading and full thread coverage, these fasteners provide maximum thread engagement in wood-to-metal connections, structural framing, and heavy equipment assemblies. The zinc plating creates a protective barrier against corrosion in outdoor applications, while the 60,000 PSI tensile strength ensures reliable performance in construction, agricultural machinery, and transportation equipment where anti-loosening characteristics are essential for safety and longevity.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit with UNC coarse thread pattern (3/8"-16) and complies with ASTM A307, SAE J429 Grade 2, and ASME B18.5 manufacturing specifications. The product is RoHS 3 (2015/863/EU) Compliant and meets all dimensional requirements for industrial fastener applications, including the critical square neck dimensions (0.39" width, 0.22" length) that ensure proper anti-rotation performance in assembled components.