S-93604A629 1/4"-20 x 4" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel coating for long-lasting performance in harsh environments
• Enhanced structural integrity with Grade 2 classification providing 60,000 PSI tensile strength for reliable load-bearing applications
• Secure anti-rotation locking through the square neck design that prevents spinning during installation and use
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring easy assembly and vibration resistance
• Exceptional surface durability with Rockwell B70 hardness maintaining bolt integrity under repeated stress
• Full-threaded versatility allowing for maximum adjustability and clamping force distribution
• Regulatory compliance assurance meeting ASTM A307, ASME B18.5 standards and environmental regulations

Professional Applications & Engineering Value

These hot-dipped galvanized steel carriage bolts deliver exceptional engineering value in demanding industrial settings where corrosion resistance and structural reliability are paramount. The square neck design provides positive locking action that eliminates rotation during torque application, making them ideal for wood-to-metal connections, structural framing, and machinery assembly. The UNC coarse threading ensures rapid installation in various materials while maintaining vibration resistance in dynamic environments. With Grade 2 strength classification and 60,000 PSI tensile strength, these fully threaded fasteners provide consistent clamping force across the entire 4-inch length, making them particularly valuable in construction, agricultural equipment, and outdoor infrastructure projects where environmental exposure demands maximum durability.

Specification Summary & Compliance

This 1/4"-20 carriage bolt features precise Class 2A thread fit with UNC coarse threading and maintains dimensional compliance with ASME B18.5 standards. Manufactured to ASTM A307 specifications for carbon steel bolts, it demonstrates full conformance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The hot-dipped galvanized coating provides consistent corrosion protection while the square neck configuration ensures proper anti-rotation performance in accordance with industry standards for carriage bolt applications.