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Description
The 3M 7000121786 cartridge roll mandrel is a precision tool made for securing abrasive cartridge rolls during machining and finishing in confined or recessed areas. This abrasive mandrel, which has a 1/4-inch shank and an overall length of 3.25 inches, extends cartridge rolls into tight bores, slots, and angled surfaces that standard abrasives cannot reach. The mandrel has a 0.12 in (3.05 mm) pilot diameter, a 1.5 in (38.1 mm) pilot length, a threaded attachment, and a plated-steel construction for long-lasting performance in production and maintenance environments. The 3M cartridge roll mandrel is designed for use with Standard Abrasives cartridge rolls and mounts directly into die grinders, drills, or rotary tools. It is ideal for metalworking, deburring, and finishing tasks that require repeatable, measurable access to internal geometries.
Product Features and Benefits
Precise 1/4 In Shank For Standard Tool Chucks
The 3M Cartridge Roll Mandrel is 0.25 inch shank and fits common collets and drill chucks for secure mounting to die grinders and rotary tools. It provides consistent concentricity for controlled abrasive contact.
Extended 3.25 in Overall Length For Reach
At 3.25 inches overall, the mandrel gives added reach to access deep holes and recessed features when used with cartridge rolls.
0.12 in Pilot Optimized For Cartridge Rolls
The 3.05 mm pilot diameter and 1.5 in pilot length match standard cartridge-roll arbor holes to ensure firm engagement and reduce slippage.
Threaded Attachment And Plated-Steel Durability
A threaded attachment secures the cartridge roll, while plated-steel construction resists wear and extends service life in industrial use.
Compatible With Straight, Tapered And Sidewall Rolls
This 3M abrasive mandrel works with all standard abrasive cartridge roll profiles—straight, full tapered, and half tapered—making the mandrel versatile across jobs.
Product Specifications
| Manufacturer Part Number | 7000121786 |
| Legacy SKU | 66000005281 |
| Overall Length (Inch) | 3.25" |
| Overall Length (mm) | 82.55mm |
| Shank Length (Inch) | 1.25" |
| Shank Length (mm) | 31.75mm |
| Shank Size (Inch) | 0.25" |
| Shank Size (mm) | 6.35mm |
| Pilot Diameter (Inch) | 0.12" |
| Pilot Diameter (mm) | 3.05mm |
| Pilot Length (Inch) | 1.5" |
| Pilot Length (mm) | 38.1mm |
| Attachment Type | Threaded |
| Form Type | Cartridge Roll |
| Product Type | Mandrel |
Frequently Asked Questions
What is a mandrel used for?
A mandrel is used for holding and driving abrasive cartridge rolls or other tooling in rotary power tools for internal finishing tasks.
How do I choose the correct abrasive mandrels for cartridge rolls?
Match the shank size to your tool, the pilot diameter to the cartridge roll arbor, and the length to the reach required for the workpiece.
Is this 3M cartridge roll mandrel suitable for die grinders?
Yes, the 3M 7000121786 1/4 in shank is designed for secure use in die grinders and similar rotary tools.
What is a mandrel, and why is it used in metalworking?
A mandrel is used to support and drive abrasives into bores, slots, and contours for grinding, deburring, and finishing operations.
Warning:
This product can expose you to materials and/or chemicals including arsenic, lead, and other materials and/or chemicals which are known to the state of California to cause cancer and/or reproductive harm.
For more information, visit www.P65Warnings.ca.gov
