S-90185A258 5/8"-11 x 3 1/4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the integrated square neck design, which locks securely into materials to prevent spinning during installation and under vibration.
• Exceptional tensile strength and durability with a Grade 5 rating and 120,000 PSI tensile strength, ensuring reliable performance in demanding structural and heavy-duty applications.
• Enhanced corrosion resistance provided by the zinc-plated steel construction, extending the bolt's service life in various industrial environments.
• Optimized thread engagement and fastening reliability due to the fully threaded UNC coarse thread (5/8"-11) with a precise Class 3A fit, allowing for quicker assembly and strong holding power.
• Wide, rounded carriage head design distributes clamping force effectively and provides a finished appearance, reducing the risk of surface damage.
• Consistent hardness and material integrity with a Rockwell C25 hardness, ensuring the bolt can withstand high shear and tensile stresses without failure.
• Broad regulatory compliance meets ASME B18.5, SAE J429, RoHS 3, and REACH standards, ensuring suitability for global industrial supply chains and specialized projects.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address critical challenges in industrial fastening, such as joint integrity under dynamic loads and corrosion in harsh environments. The square neck design is a key feature that prevents rotation when tightened, making it ideal for wood-to-metal connections, structural framing, and machinery assembly where disassembly is not frequent. The fully threaded UNC coarse threading (5/8"-11) ensures rapid installation and high resistance to vibration loosening, while the zinc plating offers a protective barrier against rust, extending service life in outdoor or humid conditions. With a 120,000 PSI tensile strength and Rockwell C25 hardness, it provides reliable performance in heavy-duty applications like construction, agricultural equipment, and transportation infrastructure, ensuring long-term safety and reduced maintenance costs.

Specification Summary & Compliance

This carriage bolt features a 5/8"-11 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy and reliable fastening. It is manufactured in accordance with ASME B18.5 and SAE J429 standards, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for use in various industrial markets.