S-90185A435 1/2"-13 x 2 1/4" 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 the bolt from spinning during installation and under vibration.
• Exceptional strength and durability with Grade 5 classification and 120,000 psi tensile strength, suitable for demanding structural and heavy-duty applications.
• Enhanced corrosion resistance from the zinc-plated steel construction, extending service life in various industrial environments.
• Reliable fastening in wood and metal due to the fully threaded UNC coarse pattern, which provides quick assembly and strong holding power.
• Precision fit and reduced cross-threading risk with Class 3A thread fit, ensuring consistent performance and ease of use.
• Wide bearing surface for secure clamping from the rounded carriage head, distributing load effectively and minimizing surface damage.
• Compliance with major industry standards including ASME B18.5, ensuring high-quality manufacturing and interchangeability.

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 material fatigue. The square neck integrates seamlessly into pre-drilled holes, providing a reliable anti-rotation feature that eliminates the need for additional locking components, saving time and reducing assembly costs. With a fully threaded UNC coarse pattern and Class 3A thread fit, it ensures quick, secure fastening in wood, metal, and composite materials, making it ideal for structural frameworks, machinery, and transportation equipment. The zinc-plated finish offers robust protection against rust and corrosion, enhancing longevity in harsh environments. By combining high tensile strength (120,000 psi) and Rockwell C25 hardness, this bolt delivers consistent performance under heavy loads, reducing maintenance downtime and improving overall system reliability.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and optimal engagement. It meets ASME B18.5 and SAE J429 specifications, ensuring uniformity and reliability in industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material sustainability.