S-93604A631 1/4"-20 x 4 1/2" ASTM A307, ASTM A153, ASME B18.5 Carriage Bolts
Carriage Bolts
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Basic Information
Head Parameters
Neck & Shank Parameters
Dimension Parameters
Thread Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion protection with hot-dipped galvanized steel coating, ensuring long-term reliability in harsh environments
- Exceptional tensile strength of 60,000 PSI (Grade 2) for reliable load-bearing capacity in structural applications
- Anti-rotation security provided by the integrated square neck, preventing bolt spinning during installation and use
- Easy installation and removal with UNC coarse threading and Class 2A thread fit for smooth engagement
- Enhanced durability with Rockwell B70 hardness, maintaining structural integrity under repeated stress
- Full thread coverage along the 4-1/2" length for maximum fastening flexibility and grip range
- Wide rounded head design for better load distribution and reduced surface damage
Professional Applications & Engineering Value
These hot-dipped galvanized steel carriage bolts deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The Grade 2 classification with 60,000 PSI tensile strength makes them ideal for construction, agricultural equipment, and outdoor structural applications requiring reliable fastening under environmental stress. The square neck design effectively prevents rotation during torque application, eliminating the need for secondary locking mechanisms. With UNC coarse threading and Class 2A thread fit, these bolts provide quick installation in wood-to-metal and structural wood connections, while the fully threaded 4-1/2" length accommodates various material thicknesses. The rounded head profile offers superior bearing surface without damaging connected materials.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC 1/4"-20 coarse threading. Complies with ASTM A307 for low carbon steel structural bolts, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 for carriage bolt dimensional requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards.
