S-90185A181 3/8"-16 x 1 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that locks securely into materials, preventing spin-out during installation and use.
• Exceptional tensile strength rated at 120,000 psi, making it ideal for heavy-duty applications requiring reliable load-bearing capacity.
• Enhanced corrosion resistance from the zinc-flake coating, providing long-lasting durability in harsh industrial environments.
• Optimized thread engagement with UNC coarse threading and Class 2A fit, ensuring easy installation and secure fastening.
• High material hardness at Rockwell C25, offering excellent resistance to wear and deformation under stress.
• Broad regulatory compliance meeting ASME B18.5, SAE J429, RoHS 3, and REACH standards for safe, quality-assured use.
• Versatile right-hand threading designed for standard assembly processes, improving efficiency in high-volume operations.

Professional Applications & Engineering Value

This Grade 5 carriage bolt is engineered to address critical challenges in structural and machinery assembly, where vibration resistance and joint integrity are paramount. The zinc-flake coated steel construction combats rust and chemical exposure, extending service life in outdoor or corrosive settings. Its square neck embeds firmly into wood or metal, eliminating rotation during torque application—a common pain point in framing, trailer manufacturing, and agricultural equipment. The UNC coarse thread and Class 2A fit facilitate quick alignment and reduce cross-threading risks, streamlining installations in automotive, construction, and industrial maintenance. With full threading for consistent grip and a rounded head for smooth surface finishes, this bolt delivers reliable performance where safety and durability cannot be compromised.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards, including a Class 2A thread fit for consistent tolerance and UNC coarse threading (3/8"-16) per industry norms. Manufacturing and material specifications comply with ASME B18.5 and SAE J429 for Grade 5 classification, ensuring mechanical properties like tensile strength and hardness are rigorously validated. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing it is free of hazardous substances and safe for environmental and workplace use.