S-98060A180 1/4"-20 x 1 3/4" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance thanks to the knurled neck, preventing loosening under vibration in demanding industrial environments.
• Excellent corrosion resistance provided by the zinc-plated steel finish, extending the bolt's service life in outdoor or high-moisture applications.
• High tensile strength of 60,000 psi (Grade 2) ensures reliable load-bearing capacity for structural and heavy-duty fastening.
• Easy and quick installation with a coarse UNC thread and rounded, wide-profile head that resists counter-sinking.
• Secure and precise thread fit guaranteed by Class 2A thread tolerances, reducing the risk of cross-threading and ensuring consistent performance.
• Versatile partial threading allows for a non-threaded shank to act as a pivot or to be used in clearance holes, providing design flexibility.
• Compliance with major industry standards including ASTM A307, ensuring material quality and performance reliability for professional use.

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to solve critical fastening challenges in construction, automotive, and industrial machinery. The combination of a Grade 2 strength rating and a coarse 1/4"-20 UNC thread provides exceptional resistance to vibrational loosening, a common failure point in dynamic applications. The knurled neck is a key design feature that bites into the mounting material, providing superior anti-rotation without the need for additional locking hardware. This makes it ideal for securing wood to metal, fastening heavy equipment, and assembly lines where reliability is non-negotiable. The zinc plating offers a sacrificial layer that significantly enhances corrosion resistance, making this bolt a durable, long-term solution for both indoor and outdoor projects.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for consistent and precise engagement. It is manufactured from zinc-plated steel to ASTM A307 specifications, ensuring material integrity and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for use in regulated markets and environmentally conscious supply chains.