S-93548A637 3/8"-16 x 3 1/4" 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-plated steel construction for extended service life in demanding environments
- Exceptional holding power with 60,000 psi tensile strength, ideal for structural and heavy-duty applications
- Reliable anti-rotation performance thanks to the integrated square neck design that prevents spinning during installation
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
- Enhanced durability with Rockwell B70 hardness rating that maintains integrity under repeated stress
- Versatile rounded head profile designed to sit flush while providing wide bearing surface for distributed load
- Full thread coverage along the 3 1/4" length allows for maximum adjustability and connection flexibility
Professional Applications & Engineering Value
This Grade 2 zinc-plated steel carriage bolt delivers critical engineering solutions where vibration resistance and structural integrity are paramount. The combination of fully threaded UNC coarse spacing and square neck design addresses common industrial challenges by preventing rotational movement in wood-to-metal and structural steel connections. The zinc-plated finish provides essential corrosion protection for outdoor construction, agricultural equipment, and material handling systems, while the 60,000 psi tensile strength ensures reliable performance in load-bearing applications. The rounded head with wide profile distributes clamping force effectively, making it ideal for timber framing, trailer manufacturing, and industrial machinery assembly where both security and aesthetics matter.
Specification Summary & Compliance
This carriage bolt features precision 3/8"-16 UNC coarse threads with Class 2A thread fit for consistent engagement and assembly efficiency. Manufactured to meet ASTM A307, SAE J429, and ASME B18.5 specifications, ensuring dimensional accuracy and performance reliability. The product is RoHS 3 (2015/863/EU) Compliant for environmental responsibility and global market acceptance.
