S-92356A594 5/16"-18 x 2 3/4" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term outdoor use.
• Enhanced anti-rotation security provided by the square neck design, preventing the bolt from turning during installation and under vibration.
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Wide, rounded head offers a larger bearing surface for secure fastening and a finished appearance in wood and metal assemblies.
• Precise coarse threading (UNC, Class 2A fit) ensures easy, quick installation and robust engagement with mating nuts.
• Full threading along the 2-3/4" length allows for versatile adjustment and deep penetration in various material thicknesses.
• Compliance with industry standards including ASME B18.5, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 5/16"-18 UNC Carriage Bolt is engineered to solve critical challenges in industrial assembly, where vibration resistance, material integrity, and long-term reliability are paramount. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for outdoor structures, marine equipment, and food processing machinery. The combination of a wide rounded head and square neck effectively counters rotation during torque application, eliminating the need for additional locking mechanisms and speeding up installation in wood-to-metal and structural framing applications. With a coarse thread and Class 2A thread fit, it ensures consistent, reliable performance in high-stress environments, reducing maintenance needs and enhancing the durability of your assemblies.

Specification Summary & Compliance

This carriage bolt features a diameter of 0.3125" (5/16") with a UNC coarse thread (18 TPI) and a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in compliance with ASME B18.5 specifications, ensuring dimensional accuracy and mechanical properties. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.