S-90185A422 5/16"-18 x 4 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel coating for extended service life in demanding environments
• Exceptional load-bearing capacity with Grade 5 strength rating and 120,000 psi tensile strength for heavy-duty applications
• Secure anti-rotation locking through square neck design that prevents spinning during installation and operation
• Optimized thread engagement with fully threaded UNC coarse threading for faster assembly and reliable fastening
• Precision manufacturing with Class 3A thread fit ensuring consistent performance and compatibility
• Enhanced durability with Rockwell C25 hardness providing excellent resistance to wear and deformation
• Regulatory compliance assurance meeting ASME B18.5 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt delivers exceptional engineering value for industrial applications where vibration resistance and structural integrity are paramount. The square neck design provides positive locking against rotation, eliminating the need for additional locking mechanisms in wood-to-metal and structural steel connections. The fully threaded UNC coarse threading ensures rapid installation in timber, structural frameworks, and heavy equipment assembly. With 120,000 psi tensile strength and Rockwell C25 hardness, this fastener maintains clamping force under extreme loads and vibration, making it ideal for construction, agricultural machinery, trailer manufacturing, and industrial equipment where reliability cannot be compromised. The zinc-plated finish offers corrosion protection in moderately corrosive environments, extending service life while maintaining cost-effectiveness.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior thread engagement and UNC coarse threading (5/16"-18) for optimal performance in various materials. This carriage bolt complies with ASME B18.5 specifications and SAE J429 Grade 5 requirements, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications and supply chains.