Merit Abrasives 08834181218 Mandrel Cartridge Spiral Rolls M-18

Product Description

The MERIT ABRASIVES 08834181218 is a mandrel designed for use with M-18 cartridge spiral rolls. It provides the mechanical connection between a rotary tool or die grinder and the abrasive cartridge roll, transmitting torque while maintaining accurate alignment during material removal operations. The pilot diameter measures 0.188 inches with a pilot length of 2 inches. The shank diameter is 0.25 inches with a shank length of 1.25 inches, and the overall length is 4 inches. Machinists, metal fabricators, and tool and die workers install this type of mandrel as a replacement or spare when fitting M-18 cartridge rolls for deburring, blending, and finishing work in bores, tubes, and contoured surfaces.

This mandrel is suited for precision deburring, surface blending, and internal finishing applications where cartridge spiral rolls are the abrasive medium of choice. It is used in metal fabrication shops, maintenance and repair environments, and production grinding operations. The 0.25-inch shank fits standard die grinder and rotary tool collets commonly found in those settings. The 4-inch overall length provides appropriate reach for typical bore and port finishing tasks without excessive tool overhang.

Key Features

• Pilot diameter of 0.188 inches accepts M-18 cartridge spiral rolls for secure abrasive mounting
• 0.25-inch shank diameter fits standard die grinder and rotary tool collets
• 4-inch overall length provides reach for bore and internal surface finishing
• Pilot length of 2 inches supports full cartridge roll engagement
• Lightweight at 0.03 pounds for reduced operator fatigue during extended use
• UNSPSC classified as retaining hardware (31163200) for procurement and inventory tracking

Compatibility

Designed for use with M-18 cartridge spiral rolls. The 0.25-inch shank is compatible with standard die grinder and rotary tool collets accepting that shank diameter. Verify roll bore size matches the 0.188-inch pilot diameter before installation.

Installation Notes

Installation is performed by machinists or metal fabricators using a standard collet die grinder or rotary tool rated for the shank size. Ensure the tool is powered off and disconnected from the air supply or electrical source before inserting or removing the mandrel. Thread the cartridge spiral roll fully onto the pilot before securing the assembly in the tool collet. Inspect the mandrel and roll for wear or damage before each use and replace any components that show signs of deformation or cracking.