S-90185A438 5/8"-11 x 1 3/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 120,000 psi tensile strength, this bolt provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance – Zinc-plated steel construction offers enhanced protection against rust and environmental wear, extending service life in demanding conditions.
• Secure Anti-Rotation Design – The square neck integrates seamlessly into materials, preventing bolt spin during installation and ensuring stable, vibration-resistant connections.
• Precision Thread Fit – Class 3A thread fit and UNC coarse threading enable quick, easy assembly with consistent engagement and reduced cross-threading risks.
• High Hardness for Durability – Rockwell C25 hardness ensures the bolt maintains its shape and strength under heavy loads and repeated use.
• Wide Application Compatibility – Fully threaded right-hand design and rounded carriage head allow for versatile use across wood, metal, and structural assemblies.
• Regulatory Compliance Assurance – Meets ASME B18.5 standards and is RoHS 3 and REACH compliant, ensuring safety and environmental responsibility in industrial settings.

Professional Applications & Engineering Value

This Grade 5 carriage bolt is engineered to address common industrial fastening challenges, such as joint loosening due to vibration and material degradation from corrosion. Made from zinc-plated steel, it provides a robust barrier against moisture and chemicals, ideal for outdoor machinery, construction frameworks, and agricultural equipment. The square neck design locks securely into place, eliminating rotation during torque application and simplifying installation in wood or metal surfaces. With a fully threaded UNC coarse pattern and Class 3A thread fit, it ensures rapid assembly and reliable load distribution, reducing maintenance needs in heavy-duty applications like trailer hitches, structural supports, and assembly lines. This combination of high tensile strength and precise engineering delivers long-term reliability, minimizing downtime and replacement costs.

Specification Summary & Compliance

This carriage bolt features a 5/8"-11 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy, ensuring consistent performance in inch-system applications. It complies with ASME B18.5 manufacturing specifications, guaranteeing uniformity and reliability. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.