S-90185A143 1/2"-13 x 3" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that securely locks into materials, preventing the bolt from spinning during installation and under load.
• Exceptional tensile strength of 120,000 psi from Grade 5 steel, providing reliable holding power for demanding structural and heavy-duty applications.
• Enhanced corrosion resistance with a durable black-oxide finish, extending the bolt's service life in various industrial environments.
• Optimized for quick and secure installation with a fully threaded UNC coarse pattern and Class 2A thread fit, ensuring smooth engagement and reduced assembly time.
• Wide, rounded carriage head offers a low-profile, finished appearance and distributes clamping force effectively, minimizing surface damage.
• Consistent material hardness at Rockwell C25 ensures the bolt maintains its shape and strength under high stress and vibration.
• Broad industrial compliance with ASME B18.5 standards, RoHS 3, and REACH, guaranteeing quality and environmental safety for global projects.

Professional Applications & Engineering Value

This Grade 5 Black-Oxide Steel Carriage Bolt is engineered to solve critical fastening challenges in heavy-duty industrial and construction applications. The combination of high tensile strength (120,000 psi) and a square neck under the rounded carriage head effectively prevents rotation during torque application, a common issue in wood-to-metal and structural steel connections. Its fully threaded UNC coarse pattern and Class 2A thread fit facilitate faster, more reliable installation in coarse-grained materials, reducing labor time while maintaining joint integrity. The black-oxide surface treatment provides a layer of protection against rust and corrosion, making it suitable for outdoor machinery, agricultural equipment, and framework assemblies where exposure to elements is a concern. This bolt delivers dependable performance, ensuring long-term stability and safety in demanding environments.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit and adheres to the UNC coarse thread standard (1/2"-13). It is manufactured in compliance with ASME B18.5 specifications and meets material standards per SAE J429 for Grade 5. The product is confirmed RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it is free of hazardous substances and suitable for use in regulated markets.