S-93548A724 1/2"-13 x 3" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in outdoor or humid environments.
• Enhanced anti-rotation security due to the square neck design, preventing bolt spinning during installation and ensuring stable fastening.
• High tensile strength of 60,000 psi (Grade 2) provides reliable load-bearing capacity for demanding structural applications.
• Full UNC coarse threading allows for faster installation and better performance in softer materials or where debris is present.
• Precision Class 2A thread fit ensures smooth assembly and consistent engagement with mating nuts, reducing installation time.
• Broad standards compliance including ASTM A307, SAE J429, and ASME B18.5 guarantees interchangeability and quality assurance.
• Rockwell B70 hardness offers excellent durability and resistance to deformation under stress.

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to address common challenges in heavy-duty construction and industrial assembly. The square neck design effectively counters rotation during tightening, eliminating the need for secondary locking mechanisms and speeding up installation in wood-to-metal or structural timber connections. Its fully threaded UNC coarse spacing ensures rapid engagement and reliable performance in applications where vibration or material expansion may occur, such as trailer building, agricultural equipment, and framing systems. The zinc plating provides a protective barrier against rust, making it suitable for outdoor or high-moisture environments like fencing and decking. By combining Grade 2 strength with standardized dimensions, this bolt delivers consistent, secure fastening that reduces maintenance and enhances project longevity.

Specification Summary & Compliance

This carriage bolt features a 1/2"-13 UNC coarse thread with Class 2A tolerance for precise fit, and is manufactured from zinc-plated steel with a tensile strength of 60,000 psi. It conforms to ASTM A307, SAE J429, and ASME B18.5 specifications, ensuring dimensional accuracy and mechanical performance. The product is also RoHS 3 (2015/863/EU) Compliant, meeting environmental regulations for restricted substances.