S-92356A649 3/8"-16 x 6 1/2" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• Enhanced installation security provided by the square neck design, which prevents bolt rotation during tightening for faster, safer assembly.
• High mechanical strength with a tensile strength of 70,000 psi and Rockwell B55 hardness, ensuring reliable performance under heavy loads.
• Optimized thread engagement through UNC coarse threading and Class 2A fit, facilitating quicker assembly and reducing cross-threading risks.
• Versatile partial threading allows for a secure, clamped connection on materials while leaving the unthreaded shank to bear shear forces.
• Regulatory compliance assurance meeting ASME B18.5 standards and environmental directives (RoHS 3, REACH) for global supply chain suitability.
• Durable wide, rounded head offers a larger bearing surface to minimize material embedding and provide a finished appearance.

Professional Applications & Engineering Value

This 3/8"-16 carriage bolt is engineered to solve critical fastening challenges in structural and heavy-duty applications. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for construction, agricultural machinery, and marine environments where exposure to moisture is a concern. The square neck is a key feature that locks securely into the mounting material, eliminating the need for a second tool to prevent spinning during nut installation—this drastically reduces assembly time and labor costs. The partially threaded design with UNC coarse threads ensures that the clamped materials remain tightly secured while the smooth shank portion resists shear and vibration forces. With a high 70,000 psi tensile strength, this bolt maintains integrity in demanding applications, from trailer building to industrial frame assembly, providing long-term reliability and reducing maintenance cycles.

Specification Summary & Compliance

This carriage bolt features a 3/8"-16 UNC thread with a Class 2A fit for standard clearance and easy assembly. The dimensional specifications, including the 6-1/2" length and square neck geometry, are manufactured in compliance with the ASME B18.5 standard. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.