S-90185A271 3/4"-10 x 7 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance due to the integrated square neck, ensuring the bolt stays securely in place during assembly and under vibration.
• Exceptional strength and durability with a Grade 5 classification and 120,000 psi tensile strength, making it ideal for heavy-duty structural applications.
• Enhanced corrosion resistance from the zinc-plated steel construction, providing reliable long-term performance in various industrial environments.
• Optimized for quick and secure installation with a partially threaded UNC coarse thread design, reducing assembly time and improving grip in a wide range of materials.
• High thread reliability with a Class 3A fit, ensuring precise engagement and consistent clamping force in demanding applications.
• Wide, rounded head design distributes load effectively, minimizing surface damage and providing a finished appearance.
• Guaranteed material integrity with a Rockwell C25 hardness, offering excellent resistance to wear and deformation under stress.

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 and long-term reliability. The square neck design is a key feature that prevents rotation during torque application, making it indispensable in wood-to-metal connections, structural framing, and heavy machinery where vibration resistance is paramount. The partially threaded UNC coarse thread ensures rapid installation and strong holding power in softer materials like wood or composite assemblies, while the zinc plating provides a protective barrier against rust and corrosion in harsh environments. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it delivers consistent performance in high-stress applications, from construction projects to agricultural equipment, reducing maintenance needs and enhancing operational safety.

Specification Summary & Compliance

This carriage bolt adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a 3/4"-10 UNC coarse thread with right-hand direction. It is manufactured in compliance with ASME B18.5 specifications and meets SAE J429 for Grade 5 mechanical properties. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global industrial use.