S-93548A636 3/8"-16 x 3" ASTM A307, SAE J429, 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 resistance with zinc plating that protects against rust and extends service life in demanding environments
- Enhanced anti-rotation performance due to the square neck design that prevents spinning during installation and maintains secure fastening
- Reliable tensile strength of 60,000 psi (Grade 2) ensures dependable load-bearing capacity for structural applications
- Optimized thread engagement with UNC coarse threading providing faster assembly and reduced cross-threading risks
- Wide-rounded head profile distributes clamping force evenly and reduces surface damage to connected materials
- Full threading availability allows for versatile adjustment and secure fastening across the entire bolt length
- Consistent hardness (Rockwell B70) maintains structural integrity under vibration and dynamic loads
Professional Applications & Engineering Value
This zinc-plated steel carriage bolt delivers critical engineering solutions where vibration resistance and long-term reliability are paramount. The square neck design mechanically locks into materials, eliminating rotation during torque application – a common failure point in wooden structures, metal framing, and agricultural equipment. Its UNC coarse threads provide superior pull-out resistance in soft materials while the zinc plating creates a sacrificial barrier against moisture and chemicals. Engineered for industrial applications ranging from construction frameworks to machinery assembly, this Grade 2 carriage bolt maintains clamping force under sustained vibration, preventing joint loosening in dynamic load environments.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread specifications (3/8"-16). Complies with ASTM A307, SAE J429, and ASME B18.5 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) compliance requirements for restricted substance control. Features fully threaded right-hand orientation with 3-inch length and 0.375" diameter for consistent performance across applications.
