S-98060A210 1/4"-20 x 2 1/2" ASTM A307, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments.
• Enhanced anti-rotation security provided by the knurled neck, preventing bolt spin during installation and ensuring reliable, permanent fastening.
• High tensile strength of 60,000 PSI (Grade 2) delivers dependable load-bearing capacity for structural and heavy-duty applications.
• Wide, rounded head profile distributes clamping force effectively and reduces the risk of surface damage or pull-through.
• Reliable coarse UNC threading (1/4"-20) with Class 2A fit allows for quicker assembly and better performance in materials where fine threads may strip.
• Partially threaded design combines a firm grip in the shank with secure threading, ideal for wood-to-metal and other multi-material connections.
• Consistent hardness (Rockwell B69) ensures durability and resistance to wear, maintaining fastener integrity under stress.

Professional Applications & Engineering Value

This Grade 2 zinc-plated steel carriage bolt is engineered to address common challenges in construction, agricultural equipment, and structural framing. The knurled neck is a critical feature that bites into the substrate, preventing rotation when tightening the nut—solving the issue of loose fasteners in wood, composite, or soft metal applications. Its UNC coarse thread and Class 2A thread fit provide excellent engagement and vibration resistance, reducing the risk of joint failure. The zinc plating offers a protective barrier against rust and corrosion, making it suitable for both indoor and outdoor environments. With a wide rounded head and 60,000 PSI tensile strength, this bolt ensures a secure, long-lasting connection in demanding industrial and construction settings.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. It is manufactured in compliance with ASTM A307 and SAE J429 Grade 2 specifications, ensuring consistent mechanical properties and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.