S-93604A649 5/16"-18 x 2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating for long-lasting performance in harsh environments
• Secure anti-rotation installation thanks to the integrated square neck that prevents spinning during tightening
• Excellent load-bearing capacity with Grade 2 strength rating and 60,000 psi tensile strength for heavy-duty applications
• Reliable thread engagement with fully threaded UNC coarse threading and Class 2A fit for consistent fastening performance
• Wide bearing surface from the rounded carriage head design that distributes pressure and minimizes surface damage
• Industry-standard compliance meeting ASTM A307, ASTM A153, and ASME B18.5 specifications for quality assurance
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This hot-dipped galvanized carriage bolt delivers exceptional engineering value in demanding industrial and construction environments. The Grade 2 steel construction combined with 60,000 psi tensile strength provides reliable structural integrity for heavy-load applications, while the square neck design eliminates rotation during installation, saving valuable assembly time. The fully threaded UNC coarse threading ensures quick engagement and superior holding power in wood-to-metal and structural connections. The hot-dipped galvanized coating offers superior corrosion protection, making it ideal for outdoor structures, agricultural equipment, and marine applications where moisture resistance is critical. With its 2" length and 5/16"-18 thread size, this carriage bolt serves as a versatile solution for framing, decking, and machinery assembly where vibration resistance and long-term durability are paramount.

Specification Summary & Compliance

This carriage bolt features precision Class 2A thread fit with UNC coarse threading (5/16"-18) and right-hand thread direction for standardized compatibility. Manufacturing complies with ASTM A307 for low carbon steel structural bolts, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 for dimensional standards. The product demonstrates Rockwell B70 hardness and meets environmental compliance including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions.