S-90185A634 3/8"-16 x 2 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that prevents spinning during installation, ensuring secure fastening in wood and metal applications.
• Enhanced corrosion resistance from the zinc-plated steel finish, providing durable protection in harsh industrial environments and outdoor conditions.
• High tensile strength of 120,000 psi and Rockwell C25 hardness for reliable load-bearing capacity and resistance to deformation under stress.
• Coarse UNC threading allows for quick and easy installation, reducing assembly time and minimizing cross-threading risks.
• Fully threaded design offers versatile fastening depth options, accommodating various material thicknesses with consistent grip.
• Wide rounded head profile distributes clamping force evenly, reducing surface damage and improving aesthetic integration.
• Compliance with ASME B18.5, RoHS 3, and REACH standards ensures consistent quality, safety, and environmental responsibility for industrial use.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial fastening challenges, such as vibration-induced loosening and corrosion in demanding environments. The square neck securely locks into pre-drilled holes, preventing rotation during torque application, which is critical in wood-to-metal connections, structural frameworks, and heavy machinery assemblies. The coarse UNC thread and fully threaded design enable rapid installation in soft materials like timber, while the zinc plating provides a protective barrier against moisture and chemicals, extending service life in outdoor or humid settings. With a tensile strength of 120,000 psi, it reliably supports high-stress applications in construction, automotive, and agricultural equipment, reducing maintenance needs and downtime.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit and UNC coarse threading (3/8"-16 size) for consistent engagement and ease of use. Manufactured to meet ASME B18.5 specifications, it ensures dimensional accuracy and interoperability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing adherence to environmental and safety standards for hazardous substances.