S-90185A718 1/2"-13 x 1 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck, which locks securely into materials to prevent spinning during installation and under vibration.
• Exceptional tensile strength of 120,000 psi ensures high reliability for demanding applications, reducing the risk of fastener failure under heavy loads.
• Enhanced corrosion resistance from the zinc-plated steel construction, providing a durable protective layer for extended service life in various environments.
• Optimized for quick and secure installation with a coarse UNC thread and Class 2A fit, offering excellent engagement and ease of assembly.
• High material hardness (Rockwell C25) provides excellent wear resistance and durability, maintaining bolt integrity through repeated use.
• Wide, rounded head design distributes clamping force effectively and offers a finished appearance, minimizing surface damage.
• Full compliance with industry standards including ASME B18.5, ensuring consistent quality, dimensional accuracy, and interchangeability.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to solve critical challenges in structural and heavy-duty assembly. The square neck is a key feature, designed to embed into wood or metal, providing superior anti-rotation that prevents loosening in high-vibration environments like machinery, automotive frames, and construction. The coarse UNC thread ensures rapid installation and strong holding power in wood and soft materials, while the zinc plating offers a essential barrier against rust and corrosion, extending the lifespan of outdoor structures and industrial equipment. With a high tensile strength of 120,000 psi, it reliably handles significant stress, making it a trusted industrial fastener for applications where safety and durability are non-negotiable.

Specification Summary & Compliance

This carriage bolt features a 1/2"-13 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. Manufacturing and dimensional specifications conform to ASME B18.5. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in regulated markets.