S-98060A420 5/16"-18 x 2 1/2" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the knurled neck design, preventing the bolt from turning during installation and securing connections in wood and metal assemblies.
• Enhanced corrosion resistance with zinc-plated steel construction, providing reliable protection against rust in various industrial environments.
• High tensile strength of 60,000 PSI (Grade 2) ensures dependable load-bearing capacity for heavy-duty applications without premature failure.
• Easy and quick installation with UNC coarse threading and right-hand thread direction, reducing assembly time and labor costs.
• Wide, rounded carriage head distributes clamping force evenly, minimizing surface damage and offering a clean, finished appearance.
• Precise dimensional accuracy with Class 2A thread fit and partial threading, ensuring consistent performance and compatibility with standard nuts.
• Compliance with major industry standards including ASTM A307 and environmental regulations like RoHS 3 and REACH, guaranteeing safety and reliability.

Professional Applications & Engineering Value

This Grade 2 zinc-plated steel carriage bolt is engineered to address common challenges in industrial fastening, such as vibration-induced loosening and corrosion. The knurled neck provides exceptional anti-rotation, making it ideal for wood-to-metal connections in construction, agricultural machinery, and transportation equipment where stability is critical. With a coarse UNC thread and partial threading, it offers faster installation and reduced risk of cross-threading, while the 60,000 PSI tensile strength ensures durability under dynamic loads. Its zinc plating extends service life in humid or outdoor environments, supporting long-term reliability in heavy-duty applications without frequent maintenance.

Specification Summary & Compliance

This carriage bolt features a 5/16"-18 UNC coarse thread with Class 2A fit for precise dimensional tolerance, ensuring consistent engagement. It complies with ASTM A307 specifications for material and performance, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming it is free from hazardous substances. The bolt is manufactured to Grade 2 strength requirements with a hardness of Rockwell B69, providing reliable mechanical properties for industrial use.