S-90185A226 1/4"-20 x 7 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 stable, long-term connections.
• Exceptional tensile strength and durability with Grade 5 classification and 120,000 psi tensile strength, ideal for heavy-duty applications requiring reliable load-bearing capacity.
• Enhanced corrosion resistance through zinc-plated steel construction, providing a protective barrier against rust and extending service life in harsh environments.
• Precise and reliable threading featuring UNC coarse thread with Class 3A fit, ensuring easy installation, strong engagement, and reduced cross-threading risks.
• Wide-rounded head design offers a larger bearing surface for improved load distribution and a finished appearance, reducing surface damage.
• Full threading along the 7-1/2" length allows for versatile fastening depth and secure attachment in various material thicknesses.
• Compliance with major industrial standards including ASME B18.5 and SAE J429, guaranteeing consistent quality, interchangeability, and safety in professional use.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address critical challenges in industrial and construction settings, such as vibration-induced loosening and corrosion. The square neck integrates seamlessly into pre-drilled holes, providing reliable anti-rotation without the need for additional tools, which streamlines assembly in wood-to-metal and structural framing applications. Its UNC coarse thread and Class 3A thread fit ensure quick, secure fastening even in softer materials, reducing installation time and enhancing joint integrity. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it withstands heavy loads and dynamic stresses in machinery, trailers, and agricultural equipment. The zinc plating offers a cost-effective layer of protection against moisture and chemicals, making it suitable for outdoor and industrial environments where durability is paramount.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional and performance standards, including Class 3A thread fit for tight tolerances and UNC coarse thread with a size of 1/4"-20. It meets ASME B18.5 and SAE J429 specifications, ensuring consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global industrial use.