S-90185A544 1/4"-20 x 1 1/4" ASME B18.5, SAE J429 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
- Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for heavy-duty structural connections
- Superior anti-rotation performance thanks to the integrated square neck design that prevents spinning during installation
- Enhanced corrosion resistance from zinc-plated steel construction, extending service life in demanding environments
- Reliable coarse threading with UNC pattern for faster assembly and reduced cross-threading risks
- Consistent torque performance ensured by Class 2A thread fit for precise mechanical fastening
- Optimized mechanical properties with Rockwell C25 hardness balancing strength and ductility
- Broad industrial compatibility through ASME B18.5 standard compliance for interchangeability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 carriage bolts deliver critical performance where vibration resistance and structural integrity matter most. The zinc-plated steel construction provides essential corrosion protection for outdoor equipment, agricultural machinery, and construction frameworks. The square neck design fundamentally solves the common problem of bolt rotation during nut tightening, ensuring secure fastening in wood-to-metal and structural steel connections. With fully threaded UNC coarse pattern, installation becomes significantly faster while maintaining Class 2A thread fit precision. These carriage bolts are particularly valuable in trailer manufacturing, scaffolding systems, and industrial machinery where 120,000 psi tensile strength prevents joint failure under dynamic loads.
Specification Summary & Compliance
This 1/4"-20 carriage bolt features precise Class 2A thread fit tolerances and UNC coarse threading manufactured to ASME B18.5 specifications. The fastener meets Grade 5 mechanical properties with verified 120,000 psi tensile strength and Rockwell C25 hardness. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial supply chains.
