Value Collection 215158MSC Carriage Bolt 1/4-20 2-1/2 in Grade 8

Product Description

The VALUE COLLECTION 215158MSC is a Grade 8 alloy steel carriage bolt with a 1/4-20 UNC thread and a 2-1/2 inch length under head. Carriage bolts feature a domed head and a square neck that bites into wood or soft material to prevent rotation during installation, eliminating the need to hold the bolt head while tightening. This fastener is fully threaded along its 2-1/2 inch shank and arrives with a bright, uncoated finish. Grade 8 alloy steel provides high tensile strength for demanding structural and mechanical connections. It meets SAE J429 standards and is sized in the inch measurement system.

This carriage bolt is suited for general structural fastening applications in wood, metal, and composite assemblies. Common uses include equipment mounting, framing connections, machinery guards, and utility structures where a flush, tamper-resistant head profile is required. The square neck design is particularly effective in wood framing and panel applications where the neck can seat fully into the substrate. It is used across construction, manufacturing, and maintenance trades wherever a high-strength, fully threaded carriage bolt is specified.

Key Features

• Grade 8 alloy steel construction for high tensile and proof-load strength
• Fully threaded 2-1/2 inch shank provides maximum thread engagement
• Square neck prevents rotation during tightening without a wrench on the head
• 1/4-20 UNC thread for compatibility with standard inch-system nuts and hardware
• Bright uncoated finish suitable for interior or protected installations
• Meets SAE J429 fastener standard

Compatibility

Designed as a standard inch-series carriage bolt for use with 1/4-20 UNC hex nuts, washers, and threaded inserts in structural wood, metal, and composite assemblies.

Installation Notes

Installation is typically performed by carpenters, millwrights, or general maintenance technicians using a standard wrench or socket on the nut side. Insert the bolt through a pre-drilled clearance hole and seat the square neck fully into the material before applying the nut and washer. Do not apply torque to the domed head. Follow applicable building codes or equipment manufacturer torque specifications when tightening Grade 8 fasteners in structural applications.