S-93548A626 3/8"-16 x 1 1/4" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance due to the integrated square neck design, preventing the bolt from turning during installation and ensuring a secure, permanent fit.
• Enhanced corrosion resistance from the zinc-plated steel construction, providing a durable protective layer for long-term reliability in various environments.
• High tensile strength of 60,000 PSI (Grade 2) ensures the bolt can withstand significant loads and stresses, making it suitable for heavy-duty structural applications.
• Excellent material hardness (Rockwell B70) provides resistance to wear and deformation, maintaining the bolt's integrity under repeated use.
• Easy and quick installation with fully threaded UNC coarse spacing and right-hand thread direction, allowing for faster assembly in wood and metal applications.
• Wide, rounded carriage head style offers a larger bearing surface for better load distribution and a finished appearance that reduces snagging.
• Reliable dimensional accuracy with Class 2A thread fit, ensuring consistent performance and compatibility with standard nuts and components.

Professional Applications & Engineering Value

This 3/8"-16 UNC Grade 2 zinc-plated steel carriage bolt is engineered to solve critical challenges in industrial and construction settings. The square neck design is a key feature that locks the bolt into place upon installation, effectively preventing rotation and eliminating the need for additional tools to hold the head. This is particularly valuable in wood-to-metal and structural wood applications where vibration or load shifts can loosen standard fasteners. The fully threaded body with coarse UNC spacing ensures a strong grip in softer materials, while the zinc-plated steel construction provides a cost-effective barrier against rust and corrosion, extending service life in both indoor and outdoor environments. Its 60,000 PSI tensile strength and Rockwell B70 hardness make it a dependable choice for high-stress connections in machinery, trailers, and framing, delivering engineering value through enhanced safety, reduced maintenance, and long-term performance.

Specification Summary & Compliance

This carriage bolt features a 3/8"-16 UNC thread with a Class 2A fit for standard dimensional accuracy and easy assembly. It is manufactured in compliance with ASTM A307, SAE J429, and ASME B18.5 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant, meeting environmental regulations for hazardous substance restrictions.