S-98060A430 5/16"-18 x 3" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the knurled neck design, preventing loosening under vibration in demanding applications
• Excellent corrosion resistance provided by the zinc-plated steel construction, extending service life in various environments
• High tensile strength of 60,000 PSI (Grade 2) ensures reliable fastening for structural and industrial applications
• Optimized for quick assembly with a coarse UNC thread and Class 2A fit, reducing installation time and effort
• Secure, wide bearing surface from the rounded carriage head design, minimizing surface damage and pull-through
• Durable material hardness (Rockwell B69) provides excellent wear resistance and structural integrity
• Versatile partial threading allows for effective clamping where a smooth shank is required

Professional Applications & Engineering Value

Engineered for demanding industrial and construction applications, these carriage bolts solve critical fastening challenges. The zinc-plated steel construction provides a robust barrier against corrosion, essential for outdoor structures or humid environments. The defining knurled neck is a key engineering feature, biting into the mounting material to prevent spin-out during nut tightening and resisting loosening from vibration—a common failure point in machinery and timber framing. The partially threaded design ensures that the unthreaded shank bears the shear load in structural connections, while the coarse UNC thread enables rapid installation in wood and metal. This combination of anti-rotation performance, material strength, and design intelligence delivers reliable, long-lasting connections that reduce maintenance and repair cycles.

Specification Summary & Compliance

This bolt adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and a 5/16"-18 UNC coarse thread. It is manufactured to meet ASTM A307 and SAE J429 specifications, ensuring material quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for regulated markets and sustainable procurement policies.