Value Collection 217258MSC Carriage Bolt 5/8-11 5in Grade 8

Product Description

The VALUE COLLECTION 217258MSC is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 5-inch length under the head. Fully threaded along its entire shank, it features a square neck that locks the bolt in place against the work surface as the nut is tightened, eliminating the need to hold the bolt head. The uncoated finish exposes bare steel, making it suitable for applications where a secondary coating, plating, or adhesive will be applied on-site. Manufactured to SAE J429 standards, this fastener is a strong choice for structural assemblies, machinery mounting, and heavy-duty wood-to-metal connections requiring high tensile strength.

This carriage bolt is appropriate for heavy-duty industrial, agricultural, and construction applications where Grade 8 strength is specified. Typical uses include equipment frames, implement attachments, structural timber connections, and machinery bases. The 5/8-11 coarse thread engages quickly in through-hole assemblies and provides solid clamping force under load. It is sized for use with a standard 5/8-inch heavy hex or hex nut and appropriate hardened flat washer.

Key Features

• Grade 8 alloy steel construction meets SAE J429 for high tensile and proof load requirements
• 5/8-11 UNC coarse thread for fast engagement and strong clamping in through-bolt applications
• Fully threaded shank allows maximum nut positioning flexibility along the 5-inch length
• Square neck under the domed head seats into the work surface to prevent rotation during installation
• Uncoated finish suitable for field coating, galvanizing, or adhesive treatment after installation

Compatibility

Designed as an OEM-style replacement or new-installation carriage bolt for through-bolt assemblies requiring a 5/8-11 UNC thread pattern and Grade 8 alloy steel strength rating.

Installation Notes

Installation is typically performed by maintenance mechanics, millwrights, or construction tradespeople using a standard wrench or impact driver on the mating nut. Before installation, confirm the receiving hole diameter is appropriate for a 5/8-inch fastener and that the work surface material will allow the square neck to seat and lock properly. Always torque to the specification required by the applicable structural or equipment standard, and use a hardened flat washer under the nut to distribute clamping load. Do not weld to this fastener, as heat treatment effects on Grade 8 alloy steel can be compromised by welding.