S-93180A368 5/16"-18 x 4" ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and outdoor applications
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Effective anti-rotation design featuring a square neck that securely locks into materials during installation
• Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
• Enhanced installation convenience with fully threaded design allowing for maximum adjustability in various material thicknesses
• Wide bearing surface from the rounded carriage head design that distributes load effectively and prevents pull-through
• Regulatory compliance assurance meeting ASME B18.5 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This 316 stainless steel carriage bolt delivers exceptional value in demanding industrial environments where corrosion resistance and structural integrity are paramount. The combination of marine-grade 316 stainless steel and fully threaded UNC coarse thread design addresses common challenges in wood-to-metal fastening, construction assemblies, and outdoor infrastructure. The square neck carriage bolt configuration prevents rotation during nut tightening, eliminating the need for secondary locking mechanisms in timber, structural steel, and heavy equipment applications. With its 70,000 psi tensile strength and Rockwell B55 hardness, this fastener maintains reliability in high-stress applications while the rounded head profile provides a finished appearance and safe installation in public-facing structures.

Specification Summary & Compliance

This carriage bolt features precision 5/16"-18 UNC coarse threads with Class 2A thread fit tolerance for consistent performance. Manufacturing complies with ASME B18.5 specifications ensuring dimensional accuracy and interchangeability. The product meets environmental compliance standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for regulated industries and international markets.