Value Collection KP64909 Carriage Bolt 5/8-11 3in Grade 8

Product Description

The VALUE COLLECTION KP64909 is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 3-inch length under head. The square neck under the domed head locks into material during installation, preventing the fastener from spinning without the need for a secondary tool on the bolt head. The zinc trivalent chromate finish provides corrosion resistance suited to demanding service environments. This bolt is fully threaded along the entire 3-inch shank. It meets SAE J429 standards and is sold in a package quantity of 25.

Grade 8 carriage bolts in this thread size are commonly used in heavy structural assemblies, machinery mounting, wood-to-metal connections, and agricultural equipment fabrication. The 5/8-11 UNC thread is a standard coarse pitch widely used in North American industrial and construction applications. These fasteners are appropriate for use wherever high tensile strength and a clean, flush-bearing bolt head profile are required. Installation is typically performed by mechanics, millwrights, ironworkers, and general tradespeople working with structural or mechanical assemblies.

Key Features

• Grade 8 alloy steel construction for high tensile strength in demanding applications
• 5/8-11 UNC fully threaded shank, 3 inches length under head
• Square neck under domed head prevents rotation during nut tightening
• Zinc trivalent chromate finish for corrosion resistance
• Meets SAE J429 fastener standard
• Sold in a package of 25 fasteners

Compatibility

Designed as a standard 5/8-11 UNC Grade 8 carriage bolt suitable for structural, mechanical, and fabrication applications requiring a high-strength, fully threaded fastener with a square-neck domed head profile.

Installation Notes

Installation is performed by inserting the bolt through a pre-drilled hole so the square neck seats firmly into the material, then threading a nut onto the exposed end and tightening with a wrench or impact tool. No wrench is needed on the bolt head when the square neck is properly seated. Always verify hole size matches the bolt shank diameter and consult applicable structural or mechanical codes for torque requirements. Use appropriate personal protective equipment when working with fasteners in high-load assemblies.