Value Collection 217218MSC Carriage Bolt 5/8-11 4 in Grade 8

Product Description

The VALUE COLLECTION 217218MSC is a fully threaded carriage bolt designed for high-strength fastening applications in industrial, structural, and mechanical assemblies. It features a 5/8-11 UNC thread size with a 4-inch length under head, a square neck that locks against the work surface to prevent rotation during installation, and a Grade 8 alloy steel construction rated for demanding load conditions. The uncoated, bright finish makes it suitable for applications where surface treatments will be applied after assembly or where coating is not required. This bolt is manufactured to SAE J429 standards, confirming material and mechanical property compliance.

This carriage bolt is used in structural connections, equipment fabrication, heavy machinery assembly, and maintenance applications requiring a flush, round-head fastener with no external drive. The square neck under the domed head bites into the mating material to resist torque during nut tightening. It is commonly installed by millwrights, ironworkers, maintenance technicians, and general contractors working with metal or heavy timber framing. Single-piece packaging makes it available for one-off replacements or small-batch repairs.

Key Features

• Grade 8 alloy steel construction for high tensile and proof load capacity
• 5/8-11 UNC thread standard ensures broad nut and hardware compatibility
• Fully threaded shank along the full 4-inch length under head
• Square neck under domed head resists rotation without a wrench or driver on the bolt end
• Uncoated bright finish suitable for post-assembly coating or bare steel applications
• Manufactured to SAE J429 fastener standard for verified mechanical properties

Compatibility

Designed as a standard 5/8-11 UNC fully threaded carriage bolt for use with any 5/8-inch heavy hex or standard hex nut and compatible structural hardware meeting SAE J429 Grade 8 specifications.

Installation Notes

Installation is typically performed by qualified tradespeople familiar with structural fastening torque requirements for Grade 8 hardware. Insert the bolt through a pre-drilled hole sized to engage the square neck, then thread the nut from the opposite side and tighten with a standard wrench or impact tool. Do not apply heat to alter the bolt geometry or mechanical grade. Consult applicable structural or mechanical codes for required torque values and joint design requirements specific to your application.