S-90185A826 5/8"-11 x 4" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior anti-rotation performance with a square neck that locks securely into materials, preventing the bolt from turning during installation and use.
• Exceptional tensile strength of 120,000 psi (Grade 5) ensures reliable load-bearing capacity for heavy-duty and structural applications.
• Enhanced corrosion resistance from zinc-plated steel construction, extending service life in harsh or outdoor environments.
• Wide rounded carriage head provides a larger bearing surface for secure fastening and reduces the risk of pull-through in wood and metal assemblies.
• Coarse UNC threading (5/8"-11) allows for faster installation and better performance in softer materials or where vibration resistance is critical.
• Consistent dimensional accuracy with Class 2A thread fit, ensuring easy assembly and interchangeability in industrial settings.
• High hardness (Rockwell C25) offers excellent wear resistance and durability under repetitive stress and high-torque conditions.

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel carriage bolt is engineered to address common industrial fastening challenges, such as joint loosening due to vibration and material wear. The square neck design mechanically locks into the assembly, providing reliable anti-rotation without the need for additional tools or fasteners. Its fully threaded UNC coarse thread ensures quick and secure engagement, making it ideal for construction, heavy equipment, and automotive applications where speed and stability are paramount. The zinc plating adds a protective layer against moisture and chemicals, reducing maintenance needs and downtime. With a rounded head profile, it minimizes surface damage and improves safety in visible or high-traffic areas, delivering long-term performance and cost efficiency.

Specification Summary & Compliance

This carriage bolt features a 5/8"-11 UNC coarse thread with Class 2A fit for precise dimensional tolerance and easy assembly. It meets ASME B18.5 and SAE J429 specifications, ensuring consistent quality and performance. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global industrial use.