S-98060A212 1/4"-20 x 3" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Exceptional vibration resistance due to the knurled neck design that prevents rotation during installation and use
• High tensile strength of 60,000 PSI (Grade 2) ensures reliable performance in heavy-duty applications
• Wide, rounded carriage head provides a larger bearing surface for secure fastening without sinking into materials
• Coarse UNC threading (1/4"-20) allows for quicker installation and better grip in wood and soft materials
• Rockwell B69 hardness offers excellent durability and resistance to deformation under load
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance for industrial use

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to solve critical fastening challenges in industrial settings. The knurled neck is a key feature that bites into the mounting surface, effectively preventing the bolt from spinning during torque application—a common frustration in assembly lines. With its Grade 2 strength rating and 60,000 PSI tensile strength, it provides reliable holding power for structural connections in wood-to-metal and heavy timber constructions. The partially threaded UNC design ensures that the unthreaded shank bears the shear load, while the threaded portion secures the nut, making it ideal for agricultural equipment, trailer assemblies, and construction frameworks where vibration resistance is paramount. The zinc plating adds a protective barrier against rust, crucial for outdoor or high-moisture environments.

Specification Summary & Compliance

This carriage bolt adheres to Class 2A thread fit for consistent engagement and meets ASTM A307 specifications for low-carbon steel fasteners. It features a 1/4"-20 UNC coarse thread with a minimum thread length of 3/4" and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring it is free from hazardous substances and suitable for global industrial supply chains.