S-93604A901 1/4"-20 x 8" 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 resistance with hot-dipped galvanized steel coating, ideal for long-term outdoor and industrial exposure.
- Enhanced anti-rotation performance due to the square neck design, preventing loosening under vibration and dynamic loads.
- High tensile strength of 60,000 PSI and Rockwell B70 hardness for reliable load-bearing in demanding applications.
- Secure partial threading with UNC coarse thread ensures quick installation and strong grip in wood and metal assemblies.
- Wide rounded head profile distributes clamping force evenly, reducing surface damage and improving aesthetics.
- Compliance with ASTM A307, ASTM A153, and ASME B18.5 standards guarantees consistent quality and engineering reliability.
- RoHS 3 compliance ensures environmental safety and meets international regulatory requirements.
Professional Applications & Engineering Value
This hot-dipped galvanized steel carriage bolt is engineered to address common challenges in heavy-duty outdoor and construction applications, such as structural framing, fencing, and machinery assembly. The square neck design effectively counters rotation during tightening, eliminating the need for additional locking mechanisms and reducing installation time. Made from Grade 2 material with a Rockwell B70 hardness, it withstands high stress and environmental wear, while the partial UNC threading and Class 2A thread fit ensure precise engagement and vibration resistance. Ideal for industrial fastening where durability and corrosion resistance are critical, this bolt offers a dependable solution for long-term performance in harsh conditions.
Specification Summary & Compliance
This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard tolerance and ease of assembly. It meets ASTM A307 for low carbon steel bolts, ASTM A153 for zinc coating (hot-dip), and ASME B18.5 for dimensional consistency. The product is RoHS 3 (2015/863/EU) Compliant, ensuring it is free from hazardous substances, and is designed for reliable use in construction and industrial settings.
