S-93180A678 1/2"-13 x 8" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 316 stainless steel construction, ideal for harsh industrial and marine environments
• Superior mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable heavy-duty performance
• Secure anti-rotation locking provided by the integrated square neck, preventing bolt spinning during installation
• Optimized load distribution through the wide, rounded carriage head design, minimizing surface damage
• Precision threading compatibility with Class 2A UNC coarse threads ensuring consistent, reliable fastening
• Versatile partial threading allowing unthreaded shank sections to bear shear loads effectively
• Full regulatory compliance meeting ASME B18.5 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This heavy-duty carriage bolt delivers exceptional engineering value in demanding industrial applications where corrosion resistance and structural integrity are paramount. The 316 stainless steel composition provides superior protection against chemical exposure and atmospheric corrosion, making it ideal for marine equipment, chemical processing facilities, and outdoor structural assemblies. The square neck design effectively prevents rotation during torque application, eliminating the need for secondary locking mechanisms and reducing installation time. With its partially threaded configuration and UNC coarse threading, this fastener maintains optimal clamping force while allowing the unthreaded portion to function as a precision shear plane. The 8-inch length and 1/2"-13 thread size make it particularly suitable for heavy timber construction, industrial machinery framing, and transportation equipment where vibration resistance and long-term reliability are critical performance requirements.

Specification Summary & Compliance

This carriage bolt maintains Class 2A thread fit tolerances according to UNC standards, ensuring consistent threading compatibility across industrial applications. Manufacturing complies with ASME B18.5 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) certification for chemical safety, confirming its suitability for regulated industries and international markets.