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Three black O-ring drive belts on a plain background

RTumbler, LLC

RTumbler, LLC Rock Tumbler Replacement Drive Belt 3 Pack STEM Toy

SKU CH-27VB-NTWQW

Three-pack of Buna nitrile O-ring drive belts fits Thumler's and Model B rock tumblers, staying pliable to -20 °F with a 15-year shelf life

  • Product colorBlack
  • Product typeScience
  • Age groupAdult
  • Suitable forUnisex
  • Buna nitrile stays pliable down to -20 °F
  • Greater flexibility and abrasion resistance than natural rubber
  • O-ring style replaces original factory V-belts
  • 15-year shelf life keeps spares ready
  • Three-pack covers multiple tumbler models

Replacement Drive Belts for Rock Tumblers

This three-pack supplies spare drive belts for compatible Thumler's Tumbler and Model B tumblers. They are made from Buna nitrile rather than natural rubber. The material stays pliable in cold conditions and resists abrasion during extended tumbling runs.

Practical Limits of the Belt Material

Buna nitrile remains flexible down to minus 20 F, so the belts work in unheated workshops or garages. The 15 year shelf life means spares can be stored for long periods without degrading. They are designed as direct replacements for the original factory V belts.

When to Replace the Original Belts

Swap the factory rubber belts when they stretch, crack or lose grip on the pulleys. The nitrile construction gives greater flexibility and abrasion resistance, extending service intervals. This pack is not for users who need belts for other tumbler brands or non-standard pulley sizes.

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 colorBlack
Product typeScience
More details
Age groupAdult
Suitable forUnisex

Questions about this item

How many belts come in this pack?

The pack contains 12 replacement drive belts for rock tumblers.

What advantage does the Buna nitrile material give over standard rubber belts?

Buna nitrile stays pliable down to -20 °F and resists abrasion better than natural rubber.

How long can these belts be stored before use?

They carry a 15 year shelf life when kept in proper conditions.

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