S-93548A558 1/4"-20 x 4" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts

Key Features & Benefits at a Glance

• Secure anti-rotation performance due to the square neck design that prevents spinning during installation and use
• Enhanced durability and corrosion resistance from the zinc-plated steel construction, suitable for demanding environments
• Reliable tensile strength with 60,000 psi and Rockwell B70 hardness for heavy-duty applications
• Easy installation and removal with fully threaded UNC coarse thread and right-hand direction
• Wide rounded head design provides a larger bearing surface for better load distribution
• Precise thread fit with Class 2A tolerance ensuring consistent engagement and reduced risk of cross-threading
• Compliance with major industry standards including ASTM A307, SAE J429, and ASME B18.5 for assured quality

Professional Applications & Engineering Value

This zinc-plated steel carriage bolt is engineered to address common challenges in industrial and construction settings, such as vibration-induced loosening and material degradation. The square neck securely locks into materials, preventing rotation during torque application and long-term use, which is critical for structural integrity in wood-to-metal connections and framing. Its Grade 2 strength and coarse UNC thread facilitate quick assembly in softwoods or composite materials, reducing installation time while maintaining a 60,000 psi tensile strength. The zinc plating offers a protective barrier against rust, making it ideal for outdoor equipment, agricultural machinery, and infrastructure projects where exposure to elements is a concern. By meeting ASTM A307 and other standards, it ensures reliability in load-bearing applications, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This carriage bolt features a 1/4"-20 UNC coarse thread with Class 2A fit for precise dimensional accuracy, ensuring consistent performance. It complies with ASTM A307, SAE J429, and ASME B18.5 specifications, guaranteeing adherence to recognized manufacturing and material standards. Additionally, it is RoHS 3 (2015/863/EU) Compliant, confirming the absence of hazardous substances for environmental and safety regulations.