S-93548A644 3/8"-16 x 5" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck design that securely locks into materials, preventing bolt spin during installation and under vibration.
• Excellent corrosion resistance provided by the zinc-plated steel construction, ensuring long-term durability in various environmental conditions.
• High tensile strength of 60,000 PSI (Grade 2) for reliable performance in demanding structural and construction applications.
• Easy and quick installation with fully threaded UNC coarse spacing and Class 2A thread fit, offering smooth engagement and reduced assembly time.
• Wide-rounded head profile distributes clamping force effectively, minimizing surface damage and providing a secure, finished appearance.
• Consistent hardness (Rockwell B70) ensures the bolt maintains its shape and strength under heavy loads and repeated stress.
• Compliance with major industry standards including ASTM A307, SAE J429, and ASME B18.5, guaranteeing quality and interchangeability.

Professional Applications & Engineering Value

This Grade 2 zinc-plated steel carriage bolt is engineered to address critical challenges in heavy-duty industrial and construction applications. The square neck design effectively prevents rotation when tightened, making it ideal for wood-to-metal and structural connections where security is paramount. Its fully threaded UNC coarse thread ensures rapid installation and strong holding power in soft materials, while the zinc plating offers reliable corrosion protection, extending service life in outdoor or humid environments. With a 60,000 PSI tensile strength and Rockwell B70 hardness, it withstands significant stress and vibration, reducing maintenance needs and enhancing safety in frameworks, trailers, and machinery assemblies.

Specification Summary & Compliance

This carriage bolt features precise Class 2A thread fit and UNC coarse threading (3/8"-16), ensuring consistent performance and easy assembly. It is manufactured in compliance with ASTM A307, SAE J429, and ASME B18.5 specifications, confirming adherence to dimensional and mechanical standards. Additionally, the product is RoHS 3 (2015/863/EU) Compliant, supporting environmental safety and regulatory requirements in global markets.