S-98060A580 5/16"-18 x 1 3/4" SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior Anti-Rotation Performance: Knurled neck design provides exceptional resistance to loosening under vibration, ensuring reliable fastening in demanding applications.
• High-Strength Construction: Grade 5 classification and 120,000 psi tensile strength guarantee durability and load-bearing capacity for heavy-duty industrial use.
• Enhanced Corrosion Resistance: Zinc-plated steel material offers a protective barrier against rust and environmental degradation, extending the bolt's service life.
• Easy and Secure Installation: UNC coarse threading and Class 2A thread fit enable quick assembly with reliable engagement and consistent torque performance.
• Optimized Load Distribution: The wide, rounded carriage head and partially threaded shank minimize surface damage and provide secure clamping force.
• Material Hardness for Durability: Rockwell C25 hardness ensures the fastener maintains its structural integrity and resists wear under repeated stress.
• Broad Industrial Compliance: Meets SAE J429 specifications and is compliant with RoHS 3 and REACH environmental regulations for safe, global usage.

Professional Applications & Engineering Value

This Grade 5 Zinc-Plated Steel Carriage Bolt is engineered to address critical challenges in structural and machinery assembly. The knurled neck beneath the wide, rounded head effectively bites into the mating material, preventing spin-out during nut tightening and providing a permanent anti-rotation lock—a key solution for vibrating equipment, trailer beds, and wood-to-metal connections. Its UNC coarse thread (5/16"-18) is less prone to cross-threading and is ideal for faster assembly in softer materials or where debris is present. The partially threaded design ensures that the unthreaded shank bears the shear load, while the threaded portion secures the nut, making it a superior choice for high-strength industrial applications requiring reliable, long-term performance and compliance with rigorous standards.

Specification Summary & Compliance

This carriage bolt features a 5/16"-18 UNC thread with a Class 2A fit for standard tolerance and easy assembly. It is manufactured to meet the material and mechanical requirements of SAE J429 for Grade 5 fasteners. The product is confirmed to be compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and safe for use in various industrial markets.