S-90185A830 5/8"-11 x 4 1/2" ASME B18.5, SAE J429 Carriage Bolts

Key Features & Benefits at a Glance

• Superior Anti-Rotation Performance: Integrated square neck design prevents bolt spinning during installation and under vibration, ensuring secure fastening in demanding applications.
• Enhanced Corrosion Resistance: Zinc-plated steel construction provides a durable protective barrier, extending service life in harsh or outdoor environments.
• High Mechanical Strength for Heavy Loads: Grade 5 classification and 120,000 psi tensile strength guarantee reliable performance in structural and high-stress applications.
• Fast and Efficient Installation: Coarse UNC threading allows for quicker driving and reduced risk of cross-threading, saving valuable assembly time.
• Consistent and Reliable Fit: Manufactured to Class 2A thread fit for predictable and uniform engagement with nuts, ensuring joint integrity.
• Wide Bearing Surface: The rounded head with a 1.344" diameter distributes clamping force effectively, minimizing surface damage and providing a secure hold.
• Full Thread Engagement: Fully threaded design offers maximum versatility for use with materials of varying thicknesses.

Professional Applications & Engineering Value

This Grade 5 Zinc-Plated Steel Carriage Bolt is engineered to solve critical challenges in heavy-duty industrial and construction applications. The combination of high tensile strength (120,000 psi) and a Rockwell C25 hardness ensures it can withstand significant shear and tensile forces without failing. The defining square neck under the rounded head is a key engineering feature, locking securely into the mounting material to prevent rotation during nut tightening and when subjected to operational vibrations. This eliminates the need for a second tool to hold the bolt head, streamlining assembly in hard-to-reach areas. The zinc plating offers a robust defense against corrosion, making it an ideal industrial fastener for outdoor structures, agricultural equipment, and machinery where exposure to the elements is a concern. Its coarse UNC thread ensures reliable performance in wood and soft metals, providing a dependable, long-lasting fastening solution.

Specification Summary & Compliance

This carriage bolt features a 5/8"-11 UNC thread with a Class 2A fit for standard tolerance and easy assembly. It is manufactured in compliance with the ASME B18.5 standard, ensuring dimensional accuracy and interchangeability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.