S-93604A627 1/4"-20 x 3 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance from hot-dipped galvanized steel coating, ideal for outdoor or high-moisture industrial environments.
• Reliable anti-rotation performance due to the square neck design, preventing spinning during installation and ensuring secure fastening.
• High tensile strength of 60,000 PSI (Grade 2) provides dependable load-bearing capacity for structural and heavy-duty applications.
• Coarse UNC threading (1/4"-20) enables faster assembly and reduced cross-threading risk in wood, metal, and construction materials.
• Full threading along the 3-1/2" length offers versatile grip range adjustment and consistent clamping force distribution.
• Precision Class 2A thread fit ensures smooth installation with standard nuts while maintaining secure mechanical locking.
• Comprehensive regulatory compliance including RoHS 3 and REACH, meeting global environmental and safety standards for industrial use.

Professional Applications & Engineering Value

These hot-dipped galvanized steel carriage bolts deliver critical engineering solutions where corrosion resistance and vibration-proof fastening are paramount. The square neck design mechanically locks into wood or metal surfaces, eliminating rotation during torque application—solving common installation frustrations in structural framing, trailer manufacturing, and agricultural equipment. The Grade 2 strength classification combined with 60,000 PSI tensile strength ensures reliable performance in load-bearing assemblies, while the coarse UNC threading maintains engagement integrity in softer materials. Fully threaded for maximum adjustability, these carriage bolts are engineered for longevity in harsh environments, from outdoor construction to industrial machinery maintenance.

Specification Summary & Compliance

This 1/4"-20 carriage bolt features Class 2A thread fit per UNC standards with 3-1/2" full threading. Manufactured to ASTM A307 for bolt strength, ASTM A153 for zinc coating, and ASME B18.5 for dimensional consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence.