S-98060A170 1/4"-20 x 1 1/2" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a knurled neck that bites into materials, preventing loosening under vibration and dynamic loads.
• Enhanced corrosion resistance from the zinc-plated steel construction, extending service life in various industrial environments.
• Reliable strength for demanding applications with a Grade 2 classification and 60,000 PSI tensile strength, ensuring dependable fastening.
• Easy and secure installation due to the wide, rounded carriage head design, which resists pull-through and provides a clean finish.
• Optimized thread engagement with a coarse UNC 1/4"-20 thread and Class 2A fit, allowing for quicker assembly and reduced cross-threading risk.
• Versatile partial threading that allows the unthreaded shank to bear shear loads effectively, ideal for wood-to-metal and structural connections.
• Compliance with major industry standards including ASTM A307 and SAE J429, guaranteeing material quality and performance consistency.

Professional Applications & Engineering Value

This 1/4"-20 zinc-plated steel carriage bolt is engineered to solve common industrial fastening challenges, such as joint slippage and corrosion-induced failure. The knurled neck provides critical anti-rotation, making it ideal for wood construction, trailer assemblies, and agricultural equipment where vibration is a constant concern. The partially threaded design ensures that the full shank diameter carries shear loads, while the threaded portion secures the nut. Manufactured from Grade 2 steel with a Rockwell B69 hardness, it offers a balance of strength and ductility, preventing brittle fracture under stress. The zinc plating acts as a sacrificial layer, protecting against rust in outdoor or humid environments, thereby reducing maintenance cycles and improving the longevity of the overall structure.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured to meet ASTM A307 and SAE J429 Grade 2 specifications, ensuring consistent mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and safe for use in regulated markets.