S-90185A428 3/8"-16 x 6" 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
- Superior anti-rotation performance with a square neck design that locks securely into materials, preventing spinning during installation and use.
- Exceptional tensile strength rated at 120,000 psi (Grade 5), ensuring reliable performance in high-stress and heavy-duty applications.
- Enhanced corrosion resistance from the zinc-plated steel construction, extending service life in demanding industrial environments.
- Optimized for quick assembly with coarse UNC threading and full threads, allowing for faster installation and strong holding power.
- Precision thread fit with Class 3A tolerance, providing consistent, secure fastening with reduced risk of cross-threading.
- High durability backed by Rockwell C25 hardness, offering excellent resistance to wear and deformation under load.
- Rounded head profile designed for a flush, low-profile finish that minimizes snagging and improves safety in applications.
Professional Applications & Engineering Value
This Grade 5 zinc-plated steel carriage bolt is engineered to solve critical fastening challenges in industrial and construction settings. The square neck effectively counters rotation when tightened, making it ideal for wood-to-metal connections, structural frameworks, and machinery where vibration resistance is essential. Its fully threaded UNC coarse thread ensures rapid installation and robust grip in soft materials, while the zinc plating provides a protective barrier against rust and corrosion, even in outdoor or humid conditions. With a 120,000 psi tensile strength and Rockwell C25 hardness, it delivers reliable performance in heavy-load applications such as trailer assemblies, agricultural equipment, and building supports, reducing maintenance needs and downtime.
Specification Summary & Compliance
This carriage bolt adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC 3/8"-16 coarse threading. It is manufactured in compliance with ASME B18.5 specifications and meets Grade 5 requirements for strength. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global industrial use.
