S-93548A726 1/2"-13 x 3 1/2" 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 demanding industrial and outdoor environments.
• Enhanced anti-rotation and secure locking provided by the integrated square neck, preventing bolt spin during installation and under vibration.
• High tensile strength of 60,000 psi (Grade 2) ensures reliable performance in heavy-duty structural and construction applications.
• Excellent thread engagement and faster assembly with coarse UNC threading and Class 2A fit, ideal for quick installations in wood and metal.
• Wide, rounded head design distributes clamping force effectively, minimizing surface damage and providing a finished appearance.
• Full threading along the 3-1/2" length offers versatile fastening depth and flexibility for various material thicknesses.
• Consistent quality and reliability backed by compliance with ASTM A307, SAE J429, and ASME B18.5 standards.

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to address critical challenges in industrial and construction fastening. The square neck design is a key feature that mechanically locks the bolt into place upon installation, effectively preventing rotation in wood, metal framing, and machinery assemblies. This eliminates the need for secondary locking components, speeding up assembly and reducing labor costs. The coarse UNC thread (1/2"-13) ensures robust bite in softer materials and allows for quicker installation compared to fine threads. Combined with a Rockwell B70 hardness and a 60,000 psi tensile strength, this bolt provides a durable, high-strength solution for structural connections, trailer building, and agricultural equipment where vibration resistance and long-term integrity are paramount.

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. It is manufactured from zinc-plated steel and meets the material and dimensional specifications of ASTM A307, SAE J429 Grade 2, and ASME B18.5. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant, ensuring it is free from hazardous substances for use in various markets.