S-90185A425 3/8"-16 x 4 1/2" 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
- Enhanced corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Superior anti-rotation performance due to integrated square neck design that prevents spinning during installation
- High tensile strength of 120,000 PSI (Grade 5) ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides consistent engagement and reduces the risk of cross-threading
- Wide rounded head profile distributes clamping force effectively while minimizing surface damage
- Full UNC coarse threading enables faster installation and better performance in softer materials
- Rockwell C25 hardness maintains structural integrity and prevents deformation under stress
Professional Applications & Engineering Value
These Grade 5 zinc-plated steel carriage bolts deliver exceptional engineering value in industrial applications where vibration resistance and long-term reliability are critical. The square neck design provides superior anti-rotation capability, eliminating the need for additional locking mechanisms in wood-to-metal connections, structural framing, and heavy equipment assembly. The UNC coarse thread pattern ensures rapid installation while maintaining strong holding power in various substrates. With 120,000 PSI tensile strength and Rockwell C25 hardness, these fasteners withstand extreme mechanical stresses in construction, transportation, and agricultural equipment applications. The zinc plating offers reliable corrosion protection, making them suitable for both indoor and outdoor industrial environments.
Specification Summary & Compliance
This 3/8"-16 carriage bolt features precision Class 3A thread fit with UNC coarse threading and right-hand thread direction. Manufactured to ASME B18.5 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the highest standards for industrial fastener applications.
