S-90185A426 3/8"-16 x 5" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that securely locks into materials, preventing spinning during installation and ensuring reliable, long-term fastening.
• Exceptional tensile strength rated at 120,000 psi, providing Grade 5 reliability for heavy-duty applications and high-stress environments.
• Enhanced corrosion resistance through zinc-plated steel construction, extending service life in industrial and outdoor settings.
• Optimized thread engagement with UNC coarse 3/8"-16 threading and Class 3A fit, ensuring quick assembly and secure, vibration-resistant connections.
• Wide, rounded head profile distributes clamping force evenly, reducing surface damage and improving load-bearing capacity.
• Full threading along the 5" length allows for versatile adjustment and deep penetration into various materials, accommodating diverse assembly needs.
• High hardness rating of Rockwell C25 resists wear and deformation, maintaining structural integrity under repetitive loads.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial fastening challenges, such as joint loosening due to vibration and material degradation from environmental exposure. The square neck integrates seamlessly into pre-drilled holes, eliminating rotation during torque application—a critical advantage in wood-to-metal connections and structural frameworks. Its UNC coarse thread and Class 3A fit facilitate rapid installation in coarse-grained materials like timber and soft metals, reducing labor time while ensuring precise alignment. With a 120,000 psi tensile strength and corrosion-resistant zinc plating, it delivers reliable performance in demanding sectors like construction, agricultural machinery, and transportation equipment, where durability and compliance with ASME B18.5 standards are paramount.

Specification Summary & Compliance

This carriage bolt adheres to inch system dimensions, featuring a 3/8"-16 UNC coarse thread with Class 3A precision for tight tolerances and consistent fit. Manufactured in accordance with ASME B18.5 specifications and SAE J429 Grade 5 requirements, it guarantees mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial supply chains.