S-97000A512 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
- Maximum Load Reliability: With a tensile strength of 150,000 PSI, this bolt ensures secure fastening in high-stress industrial environments.
- Superior Corrosion Resistance: Zinc yellow-chromate plating provides excellent protection against rust and environmental degradation, extending service life.
- Non-Rotating Installation: The square neck design locks securely into materials, preventing spin-out during assembly and reducing installation time.
- High Durability: Rockwell C33 hardness offers exceptional resistance to wear and deformation under heavy loads.
- Wide Compatibility: UNC coarse threading and Class 2A fit ensure easy engagement and reliable performance with standard nuts and components.
- Optimized Head Design: The wide, rounded carriage head distributes pressure evenly, minimizing surface damage and improving aesthetics.
- Full Thread Engagement: Fully threaded shank allows for versatile positioning and consistent clamping force across the entire length.
Professional Applications & Engineering Value
This Grade 8 carriage bolt is engineered for demanding applications where vibration resistance and structural integrity are critical. The zinc yellow-chromate plating combats corrosion in harsh environments, such as outdoor machinery, agricultural equipment, and construction frameworks. Its square neck eliminates the need for additional anti-rotation devices, speeding up assembly in metal-to-wood or composite material joints. The UNC coarse thread and Class 2A fit provide reliable, quick fastening without cross-threading risks, making it ideal for maintenance, automotive, and heavy machinery sectors where downtime reduction is essential.
Specification Summary & Compliance
This bolt adheres to ASME B18.5 and SAE J429 specifications, ensuring dimensional accuracy and performance consistency. Threading follows UNC coarse pattern with Class 2A fit for precise tolerance. The 1/4"-20 thread size, 1 1/4" length, and 0.594" head diameter meet standardized industrial requirements. Materials and plating comply with RoHS and REACH environmental regulations, supporting safe and sustainable usage.
