S-90185A116 5/16"-18 x 2 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance thanks to black-oxide steel construction, extending service life in various industrial environments
• Secure anti-rotation locking provided by the square neck design that prevents spinning during installation and use
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensures quick assembly and reliable fastening
• Enhanced durability from Rockwell C25 hardness maintains structural integrity under repeated stress and vibration
• Versatile rounded head profile with wide bearing surface distributes load evenly while providing a finished appearance
• Full thread coverage along the 2-1/2" length offers flexible positioning and maximum grip range

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions for industrial applications where vibration resistance and structural integrity are paramount. The black-oxide steel construction provides essential corrosion protection in environments exposed to moisture and chemicals, while the square neck design eliminates rotational movement once installed - a crucial feature for machinery, structural steel connections, and heavy equipment assembly. The UNC coarse threading with Class 2A fit ensures rapid installation and reliable performance in wood-to-metal and metal-to-metal applications, reducing assembly time without compromising joint security. With full threading along its 2-1/2" length, this carriage bolt offers installation flexibility across various material thicknesses, making it ideal for construction, agricultural equipment, trailer manufacturing, and industrial maintenance applications where dependable fastening is non-negotiable.

Specification Summary & Compliance

This heavy-duty carriage bolt features precise Class 2A thread fit tolerance and UNC thread standard with 5/16"-18 coarse spacing, manufactured to exacting ASME B18.5 specifications SAE J429. The product maintains full compliance with international standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. The combination of Grade 5 strength classification, Rockwell C25 hardness verification, and comprehensive standard adherence guarantees consistent performance and reliability across industrial applications.