S-98060A340 5/16"-18 x 1 1/4" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Enhanced installation security through the knurled neck design that prevents rotation during tightening
• Reliable heavy-duty performance with Grade 2 classification and 60,000 PSI tensile strength
• Optimized thread engagement using UNC coarse threading for faster assembly and reduced cross-threading risk
• Wide-bearing surface from the rounded carriage head for superior load distribution
• Consistent dimensional accuracy with Class 2A thread fit ensuring proper mating with nuts
• Full-threaded design providing maximum adjustability and grip length versatility

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these zinc-plated steel carriage bolts deliver exceptional value in construction, agricultural equipment, and structural assemblies. The combination of Grade 2 strength classification and 60,000 PSI tensile strength ensures reliable performance under significant mechanical stress. The knurled neck beneath the rounded head provides critical anti-rotation properties, eliminating slippage during vibration or dynamic loading conditions. UNC coarse threading facilitates rapid installation in wood-to-metal and structural connections, while the zinc plating offers essential corrosion protection for extended service life in challenging environments. These carriage bolts are particularly valuable in applications requiring flush mounting with the distinctive rounded head profile.

Specification Summary & Compliance

This 5/16"-18 UNC carriage bolt features Class 2A thread fit per standard industrial practice, ensuring proper clearance and engagement with matching nuts. Manufacturing complies with ASTM A307 and SAE J429 specifications for material quality and mechanical properties. The product demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to restricted substance requirements. With Rockwell B69 hardness and standardized dimensions, these fasteners deliver consistent performance across industrial applications.