S-93548A548 1/4"-20 x 1 3/4" 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 for extended service life in demanding environments
- Prevents rotation during installation thanks to the integrated square neck design for secure, one-sided fastening
- High tensile strength of 60,000 psi (Grade 2) ensures reliable performance under significant load and stress
- Wide, rounded head provides a larger bearing surface to minimize material embedment and damage
- Coarse UNC threading (1/4"-20) enables faster installation and better performance in softer materials
- Precise Class 2A thread fit ensures smooth assembly and consistent clamping force
- Full threading along the entire 1-3/4" length offers versatile positioning and maximum grip range
Professional Applications & Engineering Value
This zinc-plated steel carriage bolt is engineered to solve critical fastening challenges in construction, automotive, and industrial assembly. The combination of a square neck and rounded head prevents spinning during nut tightening, allowing for efficient one-person installation—a major advantage in large-scale projects. The Grade 2 strength classification and 60,000 psi tensile strength provide the necessary durability for structural connections, while the zinc plating offers a protective barrier against rust and corrosion, extending the lifespan of equipment and frameworks. Its fully threaded design and coarse UNC thread ensure quick, secure engagement in wood, metal, and composite materials, making it a versatile and reliable choice for heavy-duty fastening applications where vibration resistance and long-term integrity are paramount.
Specification Summary & Compliance
This carriage bolt features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from zinc-plated steel with a hardness of Rockwell B70 and meets key industry standards including ASTM A307, SAE J429, and ASME B18.5. The product is also RoHS 3 (2015/863/EU) Compliant, ensuring it is free from hazardous substances for safe use in various regulated environments.
