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Black rubber backup pad, 1 1/2 in diameter, threaded 1/4 in -20 hole, medium density

3M

3M 77729 Quick Change Disc Backup Pad 1 1/2 in

SKU CH-RZ1A-0CXEN

Quick-change backup pad for abrasive discs, 1½-inch diameter, medium-density rubber, rated to 30,000 RPM

  • Quick-change system speeds disc swaps
  • Medium-density rubber gives controlled finish
  • 30,000 RPM rating handles high-speed tools
  • 1/4 in.-20 threaded hole fits common spindles
  • Non-vacuum design keeps setup simple

3M 77729 Quick Change Backup Pad

The 3M 77729 is a rubber backup pad designed for quick-change abrasive discs. It suits metal-fabrication shops and maintenance technicians who need fast disc swaps on die grinders.

Check your grinder spindle and disc system

Verify that your tool accepts a 1/4 in.-20 threaded hole and runs at or below 30,000 RPM. The pad uses the TS quick-change mounting system, so discs must match that interface.

Fits die grinders using TS quick-change discs

The 1 1/2 in diameter pad mounts directly on a compatible spindle without extra adapters. Its medium-density rubber body supports the abrasive while the non-vacuum face keeps the setup simple for dry grinding tasks.

Highlights

  • Quick-change system speeds disc swaps
  • Medium-density rubber gives controlled finish
  • 30,000 RPM rating handles high-speed tools
  • 1/4 in.-20 threaded hole fits common spindles
  • Non-vacuum design keeps setup simple

Specifications

Brand3M

Questions about this item

Does the 3M 77729 backup pad include any quick-change discs, or must they be purchased separately?

The pad is sold as the backup pad only. Quick-change abrasive discs are not included and must be bought separately to match the TS mounting system and the 1 1/2 in diameter.

The spec lists a single 1 1/2 in diameter; are there other diameter options under the same model number?

The 77729 is supplied only in the 1 1/2 in diameter. Different diameters carry different part numbers, so this model covers one size only.

The maximum operating speed is shown as 30,000 RPM; is that speed safe for every rotary tool with a 1/4 in.-20 spindle?

The 30,000 RPM limit applies to the pad itself. The tool used must not exceed that speed, and its spindle must accept the 1/4 in.-20 threaded hole.

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