S-90185A633 3/8"-16 x 2 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with integrated square neck design that prevents spinning during installation and under load
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in demanding environments
• Exceptional load-bearing capacity with Grade 5 classification providing 120,000 psi tensile strength for heavy-duty applications
• Reliable thread engagement through fully threaded UNC coarse threading that ensures maximum holding power and faster installation
• Consistent dimensional accuracy with Class 2A thread fit guaranteeing proper mating with nuts and components
• Optimized mechanical properties with Rockwell C25 hardness balancing strength with appropriate ductility
• Broad compatibility with rounded carriage head profile accommodating various industrial and construction applications

Professional Applications & Engineering Value

These Grade 5 zinc-plated steel carriage bolts deliver critical engineering solutions where vibration resistance and structural integrity are paramount. The distinctive square neck carriage bolt design mechanically locks into materials, eliminating rotation during torque application and preventing loosening in high-vibration environments like machinery, structural steel connections, and transportation equipment. The UNC coarse threading provides superior pull-out resistance in wood, metal, and composite materials, while the zinc-plated finish protects against corrosion in industrial settings. Engineered to ASME B18.5 standards, these fully threaded fasteners ensure reliable performance in construction, manufacturing, and heavy equipment applications where failure is not an option.

Specification Summary & Compliance

This 3/8"-16 carriage bolt features precise Class 2A thread fit tolerances and UNC coarse thread specifications per ASME standards. Manufactured to meet ASME B18.5 and SAE J429 Grade 5 requirements, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener maintains dimensional accuracy with 2 1/4" length, 0.375" diameter, and square neck dimensions (0.22" length, 0.39" width) for consistent performance across industrial applications.