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Five black rubber O-ring drive belts in clear bag

RTumbler, LLC

RTumbler, LLC Replacement Drive Belt 5 Pack for National Geographic & Dr. Cool Tumblers

SKU CH-SDS0-5WN81

Five replacement drive belts made from Buna nitrile stay pliable down to -20 °F and offer a 15 year shelf life

  • Product typeScience
  • Age groupAdult
  • Suitable forUnisex
  • Superior quality belts outperform original factory rubber
  • Buna nitrile O-ring design resists abrasion and stays flexible
  • Remains pliable down to -20 F for cold environments
  • 15 year shelf life ensures long-term spare availability
  • Five-pack compatible with National Geographic and Dr. Cool tumblers

Replacement drive belts for rock tumblers

This five-pack of non-factory original belts fits National Geographic Professional and Hobby tumblers as well as Dr. Cool Hobby and Pro series models. They are designed for adults who use these STEM tumblers for science projects or hobby polishing and need a reliable spare supply.

Built for long service under continuous rotation

The belts use Buna nitrile O-ring construction that stays pliable down to -20 F and resists abrasion better than natural rubber. This material choice helps the belts endure the sustained load of tumbling drums without stretching or cracking during extended runs.

Material grade determines fit and durability

Buna nitrile gives a 15 year shelf life and greater flexibility than the original factory rubber belts. Buyers who need belts for a different brand or a non-compatible model should look elsewhere.

How it compares

Measured against everything we stock in STEM Kits & Building Blocks, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 97% of the 236 comparable items (median $28.99).

Specifications

Product
Product typeScience
More details
Age groupAdult
Suitable forUnisex

Questions about this item

How much heat can the Buna Nitrile belts handle during continuous tumbling?

They stay pliable down to -20 °F and resist abrasion better than natural rubber, so extended runs will not cause the material to harden or crack.

Which tumbler models do I need to own for these belts to fit?

They are made for National Geographic Professional and Hobby tumblers as well as Dr. Cool Hobby and Pro series units.

Will these belts work on an older National Geographic tumbler I have kept for years?

Yes, the O-ring style Buna Nitrile belts are designed as direct non-factory replacements for both current and legacy National Geographic and Dr. Cool models.

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