S-90185A224 1/4"-20 x 6 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 securely locks into materials, preventing spinning during installation and ensuring reliable, permanent fastening.
• Exceptional tensile strength of 120,000 psi as a Grade 5 bolt, providing high load-bearing capacity and resistance to shear and tensile forces in demanding applications.
• Enhanced corrosion resistance through zinc-plated steel construction, offering durable protection against rust and environmental exposure for longer service life.
• Precise and reliable threading with UNC coarse threads and Class 3A fit, ensuring easy installation, strong grip, and consistent performance in various materials.
• Wide-rounded head profile distributes clamping force evenly, reducing surface damage and providing a secure, flush finish in wood, metal, and structural assemblies.
• Full threading along the 6-1/2" length allows for adjustable engagement depth, offering versatility in applications requiring extended grip range.
• Compliance with industry standards including ASME B18.5, ensuring dimensional accuracy, interoperability, and reliability in industrial and construction settings.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy-duty environments. The square neck integrates seamlessly into pre-drilled holes, providing anti-rotation security that eliminates the need for additional locking mechanisms, saving time and reducing assembly costs. With a Rockwell C25 hardness and 120,000 psi tensile strength, it withstands high-stress conditions in construction, machinery, and transportation equipment. The UNC coarse threading and Class 3A thread fit ensure quick, reliable fastening in wood, metal, and composite materials, while the zinc plating offers lasting protection in outdoor or humid settings. Ideal for structural framing, agricultural equipment, and automotive assemblies, this bolt delivers consistent performance where durability and safety are critical.

Specification Summary & Compliance

This carriage bolt features precise dimensions including a 1/4"-20 UNC coarse thread with Class 3A thread fit for tight tolerances and reliable engagement. It meets ASME B18.5 specifications for dimensional consistency and performance. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial applications.