S-93548A640 3/8"-16 x 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, extending service life in demanding environments
- Prevents rotation during installation thanks to the square neck design that securely locks into materials
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and stress
- Excellent hardness (Rockwell B70) provides enhanced durability and resistance to wear
- Easy installation and removal with fully threaded UNC coarse spacing and right-hand thread direction
- Wide-rounded head profile distributes clamping force evenly, reducing surface damage
- Compliance with major industry standards including ASTM A307 and SAE J429 for guaranteed quality and safety
Professional Applications & Engineering Value
These Grade 2 zinc-plated steel carriage bolts are engineered to address critical fastening challenges in industrial and construction settings. The square neck effectively prevents spinning during tightening, making them ideal for wood-to-metal and structural applications where vibration resistance is essential. The fully threaded UNC coarse spacing ensures quick assembly and strong holding power in soft materials. With a 60,000 psi tensile strength and Rockwell B70 hardness, they withstand heavy loads and impact, while the zinc plating offers reliable corrosion protection for outdoor machinery, agricultural equipment, and framework assemblies. This combination of features delivers long-term reliability, reducing maintenance costs and downtime.
Specification Summary & Compliance
This carriage bolt features precise Class 2A thread fit with 3/8"-16 UNC coarse thread dimensions, ensuring consistent performance. It complies with ASTM A307 and SAE J429 Grade 2 specifications for mechanical properties, and meets ASME B18.5 dimensional standards. The product is also RoHS 3 (2015/863/EU) Compliant, confirming it is free from hazardous substances for safe use in regulated industries.
