S-90185A187 3/8"-16 x 4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Grade 5 classification and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
• Secure anti-rotation design featuring a square neck that prevents spinning during installation and maintains positioning
• Optimized thread engagement with UNC coarse spacing and Class 2A fit ensuring quick assembly and vibration resistance
• Enhanced durability from Rockwell C25 hardness, maintaining structural integrity under repeated stress
• Broad compatibility with standardized 3/8"-16 thread size meeting common industrial equipment requirements
• Regulatory compliance assurance through RoHS 3 and REACH adherence for environmentally responsible sourcing

Professional Applications & Engineering Value

Engineered for heavy-duty fastening applications, this carriage bolt delivers critical performance where vibration resistance and structural integrity are paramount. The zinc-flake coated steel construction provides superior protection against corrosion in outdoor equipment, agricultural machinery, and construction frameworks. The square neck design securely locks into assembled materials, eliminating rotation during torque application - a crucial feature for wood-to-metal connections and structural framing. With fully threaded UNC coarse spacing and Class 2A thread fit, installation efficiency is maximized while maintaining consistent clamping force across the entire 4" length. These industrial carriage bolts are specifically engineered to withstand the dynamic loads and environmental challenges encountered in transportation equipment, building infrastructure, and heavy machinery applications.

Specification Summary & Compliance

This carriage bolt maintains Class 2A thread fit tolerance with UNC coarse thread spacing (3/8"-16) and complies with ASME B18.5 dimensional standards under SAE J429 specification. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) environmental standards. Manufacturing adheres to Grade 5 mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness verification.