S-92356A139 1/4"-20 x 3 1/4" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments and outdoor applications.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads.
• Effective anti-rotation security provided by the square neck design, preventing the bolt from turning during installation and use.
• Wide rounded head profile offers a larger bearing surface for better load distribution and reduced risk of pull-through.
• Coarse UNC threading ensures quick and easy installation, even in materials where fine threads might be problematic.
• Full threading along the 3-1/4" length allows for maximum adjustability and secure fastening in a wide range of material thicknesses.
• Compliance with major industry and environmental standards including ASME B18.5, RoHS 3, and REACH for guaranteed quality and safety.

Professional Applications & Engineering Value

This 1/4"-20 UNC carriage bolt is engineered to solve critical challenges in industrial assembly and construction. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for demanding environments such as marine applications, food processing equipment, and outdoor structures. The combination of a wide rounded head and square neck delivers superior anti-rotation performance, eliminating the need for additional locking mechanisms and speeding up installation in wood, metal, and composite materials. Its fully threaded right-hand design and Class 2A thread fit ensure consistent, reliable engagement, reducing the risk of cross-threading and assembly failures. This bolt is a trusted component for securing heavy machinery, building frameworks, and transportation equipment where vibration resistance and long-term durability are paramount.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in compliance with the ASME B18.5 standard, ensuring dimensional accuracy and interchangeability. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.