S-90185A421 5/16"-18 x 3 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
- High tensile strength of 120,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure
- Zinc-plated steel construction provides excellent corrosion resistance, extending service life in various environmental conditions
- Square neck design prevents rotation during installation, ensuring secure fastening and reducing assembly time
- Class 3A thread fit with UNC coarse threading offers superior engagement and vibration resistance in industrial settings
- Grade 5 hardness rating (Rockwell C25) delivers exceptional durability and wear resistance for long-term use
- Fully threaded shank allows for maximum adjustability and consistent clamping force across the entire length
- Compliance with ASME B18.5 and SAE J429 standards guarantees consistent quality and interoperability in mechanical systems
Professional Applications & Engineering Value
This Grade 5 zinc-plated steel carriage bolt is engineered to address critical challenges in heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The square neck carriage bolt design eliminates the need for additional locking mechanisms, preventing rotation during torque application in wood-to-metal and structural connections. The UNC coarse thread pattern ensures quick installation and superior holding power in soft materials and structural components. With its 120,000 PSI tensile strength and Rockwell C25 hardness, this fastener maintains clamping force under extreme loads, making it ideal for construction equipment, agricultural machinery, trailer assemblies, and industrial framing systems where reliability cannot be compromised.
Specification Summary & Compliance
This carriage bolt features precise Class 3A thread fit tolerances with 5/16"-18 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.5 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict material restrictions.
