Value Collection KP64908 Carriage Bolt 5/8-11 2-1/2 in Grade 8

Product Description

The VALUE COLLECTION KP64908 is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 2-1/2 inch length under head. Carriage bolts feature a smooth domed head and a square neck that bites into the mating material to prevent rotation during tightening, eliminating the need for a wrench on the bolt head. This fastener is fully threaded and finished with a zinc-plated clear chromate coating for basic corrosion resistance. It meets SAE J429 standards, making it suitable for structural and mechanical fastening applications where high tensile strength is required. Installation is performed by tradespeople and fabricators working in construction, equipment assembly, and mechanical installations.

This carriage bolt is used in heavy-duty fastening applications where a Grade 8 strength rating is specified. Typical uses include structural connections in steel fabrication, equipment mounting, and framing assemblies. The square neck design is intended for use with wood, composite, or pre-drilled metal substrates that allow the neck to seat and resist rotation. The zinc-plated clear chromate finish provides mild corrosion protection suitable for indoor or sheltered environments. Sold in a package quantity of 25 per order.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load strength per SAE J429
• 5/8-11 UNC fully threaded shank with 2-1/2 inch length under head
• Square neck design prevents rotation during installation without a secondary wrench on the bolt
• Zinc-plated clear chromate finish for corrosion resistance in sheltered applications
• Fully threaded length provides maximum thread engagement across the grip range
• Package quantity of 25 fasteners per unit

Compatibility

Designed as an OEM-style replacement or direct-use carriage bolt for structural and mechanical fastening applications requiring a 5/8-11 UNC thread pattern and Grade 8 alloy steel strength rating.

Installation Notes

Installation is typically performed by ironworkers, millwrights, carpenters, or mechanical contractors. Power down or de-energize any equipment before fastening near electrical components. Insert the bolt from the face side so the square neck seats fully into the substrate before applying a nut and washer from the opposite side. Torque to the appropriate Grade 8 specification for the thread diameter as referenced in SAE J429 or applicable structural drawings — do not rely on feel alone for structural joints.