S-90185A230 5/16"-18 x 6 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for heavy-duty applications
• Reliable anti-rotation performance thanks to integrated square neck design that prevents spinning during installation
• Precision thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Enhanced installation efficiency through fully threaded design allowing full-length engagement in various material thicknesses
• Optimized mechanical properties with Rockwell C25 hardness providing excellent durability against wear and deformation
• Broad compatibility with rounded carriage head profile accommodating standard wrench sizes and flush mounting requirements

Professional Applications & Engineering Value

Engineered for industrial fastening applications where vibration resistance and structural integrity are paramount, these Grade 5 carriage bolts deliver exceptional performance in construction, machinery assembly, and transportation equipment. The zinc-plated steel construction provides essential corrosion protection for outdoor and high-moisture environments, while the square neck design eliminates the need for additional anti-rotation components, simplifying installation in wood-to-metal and structural steel connections. The fully threaded 5/16"-18 UNC coarse thread configuration ensures maximum thread engagement across varying material thicknesses, making these carriage bolts ideal for agricultural equipment, trailer manufacturing, and structural frameworks where reliable, maintenance-free fastening is critical.

Specification Summary & Compliance

This carriage bolt features precision Class 3A thread fit with 5/16"-18 UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.5 dimensional standards and meeting SAE J429 Grade 5 mechanical properties, the fastener ensures consistent performance and interchangeability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility and workplace safety standards are maintained throughout the product lifecycle.