S-93548A653 3/8"-16 x 8 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, ensuring long-lasting performance in demanding environments
• Enhanced anti-rotation security due to the square neck design, preventing bolt spin during installation and use
• Reliable tensile strength of 60,000 PSI (Grade 2) for heavy-duty applications requiring dependable load-bearing capacity
• Optimized thread engagement with UNC coarse threading and Class 2A fit, facilitating faster assembly and reduced cross-threading risks
• Wide-rounded head profile distributes clamping force evenly, minimizing surface damage and improving joint integrity
• Partial threading design allows for precise grip length control, ideal for materials where full threading isn't necessary
• Compliance with major industry standards including ASTM A307, SAE J429, and ASME B18.5, ensuring consistent quality and interchangeability

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to address common challenges in industrial fastening, such as vibration-induced loosening and corrosion in outdoor or high-moisture settings. The square neck securely locks into materials, eliminating rotation during torque application—a critical feature in wood-to-metal connections and construction assemblies. With a Rockwell B70 hardness and Grade 2 strength, it withstands substantial shear and tensile stresses, making it suitable for structural frameworks, trailer beds, and agricultural equipment. The UNC coarse thread ensures quick installation even in rough or debris-prone environments, reducing labor time while maintaining ASTM A307 compliance for reliability.

Specification Summary & Compliance

This carriage bolt adheres to Class 2A thread fit tolerances and UNC coarse thread standards (3/8"-16 size) for consistent performance. Manufacturing conforms to ASTM A307, SAE J429, and ASME B18.5 specifications, guaranteeing dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring the product is free from hazardous substances and safe for various industrial applications.