S-90185A233 5/16"-18 x 8" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh environments
• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for heavy-duty applications
• Secure anti-rotation installation through square neck design that prevents spinning during tightening
• Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in various materials
• Enhanced durability with Rockwell C25 hardness providing excellent resistance to wear and deformation
• Wide application compatibility with fully threaded 8" length and rounded head profile for diverse industrial uses
• Regulatory compliance assurance meeting ASME B18.5, SAE J429 standards and environmental regulations

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers exceptional engineering value through its zinc-plated steel construction and precision UNC coarse threading. The combination of 120,000 psi tensile strength and Rockwell C25 hardness addresses critical industrial challenges where fastener failure is not an option. The square neck design provides positive locking against rotation during assembly, eliminating the need for additional anti-rotation measures in structural applications. The fully threaded configuration ensures maximum engagement depth in wood, metal, and composite materials, while the rounded head profile offers a finished appearance with reduced snagging hazards. These features make it ideal for heavy machinery, construction frameworks, transportation equipment, and agricultural implements where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This carriage bolt maintains precise dimensional accuracy with Class 3A thread fit and UNC coarse thread pattern (5/16"-18). Manufacturing adheres to ASME B18.5 and SAE J429 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial markets. The fastener's mechanical properties include Rockwell C25 hardness and 120,000 psi tensile strength, meeting rigorous industrial standards for demanding applications.