Value Collection 217137MSC Carriage Bolt 5/8-11 2 in Grade 8

Product Description

The VALUE COLLECTION 217137MSC is a Grade 8 alloy steel carriage bolt with a 5/8-11 UNC thread and a 2-inch length under head. The square neck beneath the domed head locks into a square hole in wood or soft material, preventing rotation during nut tightening without requiring a wrench on the bolt side. A zinc trivalent chromate finish provides corrosion resistance for general industrial and structural applications. This bolt is fully threaded along its 2-inch shank length, meeting SAE J429 standards for Grade 8 fastener performance. It is used by maintenance technicians, millwrights, contractors, and fabricators in applications that demand high-strength fastening.

This carriage bolt is suited for structural connections in wood-to-metal and wood-to-wood assemblies where a flush, rounded head profile is required on the visible face. Common applications include equipment mounting, trailer fabrication, agricultural equipment repair, and general structural assembly work. The Grade 8 alloy steel construction handles high-load and high-stress environments where lower-grade fasteners would be insufficient. The SAE J429 compliance makes it appropriate for use in applications governed by engineering or construction standards.

Key Features

• Grade 8 alloy steel for high tensile strength in demanding structural applications
• 5/8-11 UNC thread — coarse thread series for fast assembly and strong engagement
• Fully threaded 2-inch shank provides maximum thread engagement flexibility
• Square neck beneath head prevents rotation during installation without a secondary tool
• Zinc trivalent chromate finish delivers corrosion resistance in moderate-exposure environments
• Meets SAE J429 Grade 8 fastener standard

Compatibility

Designed as a standard 5/8-11 UNC carriage bolt for use in wood, composite, and light metal substrates where a square-neck anti-rotation fastener of Grade 8 strength is specified.

Installation Notes

Carriage bolts are installed by driving the square neck flush into a square-punched or drilled hole so the head seats flat and the neck locks against rotation. A washer and nut are applied to the threaded end and tightened with a wrench or impact tool — no tool is needed on the head side once the neck is seated. Follow applicable structural or equipment torque specifications from the project engineer or OEM documentation, as this input data does not specify a torque value. Always ensure the mating hole is sized correctly for the square neck to prevent spinning under load.