S-90185A125 3/8"-16 x 2 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional tensile strength with Grade 5 rating and 120,000 psi capacity for reliable performance in demanding applications
• Superior corrosion resistance through black-oxide steel construction, extending service life in harsh environments
• Secure anti-rotation installation enabled by square neck design that prevents bolt turning during tightening
• Optimized thread engagement with UNC coarse threading and Class 2A fit for quick assembly and vibration resistance
• Enhanced durability from Rockwell C25 hardness, maintaining structural integrity under heavy loads
• Broad compatibility with fully threaded right-hand design accommodating various material thicknesses
• Regulatory compliance assurance meeting industry standards for quality and environmental safety

Professional Applications & Engineering Value

This Grade 5 carriage bolt delivers critical engineering solutions for industrial fastening challenges. The black-oxide steel construction provides superior corrosion protection in outdoor equipment, agricultural machinery, and structural assemblies where environmental exposure is a concern. The distinctive square neck design mechanically locks into materials during installation, eliminating rotation issues that compromise joint integrity in wood-to-metal and structural connections. With fully threaded UNC coarse pattern and Class 2A thread fit, these bolts ensure rapid installation and maintain secure fastening in high-vibration environments like trailer beds, construction frameworks, and heavy equipment. The combination of 120,000 psi tensile strength and controlled hardness makes these fasteners ideal for load-bearing applications where failure is not an option.

Specification Summary & Compliance

This carriage bolt features precise 3/8"-16 UNC coarse threading with Class 2A thread fit tolerances, ensuring consistent performance across applications. Manufacturing complies with ASME B18.5 specifications SAE J429, guaranteeing dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) compliance (01/17/2023 233 SVHC) for environmental safety, making it suitable for regulated industries and international markets.