S-93548A564 1/4"-20 x 5 1/2" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Enhanced anti-rotation performance thanks to the integrated square neck design that prevents spinning during installation
• Excellent load-bearing capacity with 60,000 PSI tensile strength and Grade 2 classification for reliable structural connections
• Optimized thread engagement through UNC coarse 1/4"-20 threading and Class 2A fit for faster assembly and vibration resistance
• Wide bearing surface from the rounded carriage head design that distributes pressure and minimizes surface damage
• Full-threaded convenience allowing installation at any point along the 5-1/2" length for versatile application flexibility
• Consistent mechanical properties with Rockwell B70 hardness ensuring dimensional stability under stress

Professional Applications & Engineering Value

These zinc-plated steel carriage bolts deliver exceptional engineering value in construction and industrial applications where vibration resistance and long-term reliability are critical. The square neck design fundamentally solves the common problem of bolt rotation during nut tightening, particularly in wood-to-metal and structural steel connections. The UNC coarse threading provides superior performance in softer materials and high-vibration environments, while the fully threaded configuration offers installation flexibility across varying material thicknesses. The rounded head profile creates a clean finished appearance while the wide bearing surface prevents pull-through in wooden applications. Meeting ASTM A307, SAE J429, and ASME B18.5 standards, these Grade 2 carriage bolts provide dependable performance in trailer manufacturing, structural framing, agricultural equipment, and heavy-duty furniture assembly where 60,000 PSI tensile strength ensures joint integrity under significant loads.

Specification Summary & Compliance

This 1/4"-20 carriage bolt features precise Class 2A thread fit with UNC coarse threading specifications, ensuring proper engagement and assembly efficiency. Manufactured to exact dimensional requirements with a 5-1/2" length, 0.594" head diameter, and 0.26" square neck width. The fastener complies with ASTM A307, SAE J429, and ASME B18.5 standards for quality assurance and is RoHS 3 (2015/863/EU) Compliant for environmental safety. Mechanical properties include Rockwell B70 hardness and Grade 2 strength classification with verified 60,000 PSI tensile capacity for reliable performance in industrial applications.