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Five black O-ring drive belts in a pack

RTumbler, LLC

RTumbler, LLC Replacement Drive Belt 5 Pack for Thumler's MP-1 and Model T Tumblers

SKU CH-P4M4-BFDPW

Five-pack of Buna nitrile O-ring drive belts for Thumler's MP-1 and Model T tumblers, rated for a 15-year shelf life and pliable to -20 F

  • Product colorBlack
  • Product typeScience
  • Age groupAdult
  • Suitable forUnisex
  • Superior quality over original factory rubber belts
  • Buna Nitrile O-ring material provides greater flexibility and abrasion resistance
  • Remains pliable down to -20 F for cold-environment operation
  • 15 year shelf life ensures long-term spare-part readiness
  • Five-belt pack covers routine maintenance for compatible Thumler's MP-1 and Model T tumblers

Replacement Drive Belt 5 Pack

This five-pack of black Buna nitrile O-ring belts replaces worn drive belts on Thumler's MP-1 and Model T tumblers. The nitrile material stays flexible down to minus 20 F and resists abrasion better than natural rubber. Each belt is approximately one-quarter inch thick and carries a fifteen-year shelf life. The belts are sold new and unisex for adult hobby use.

Upgrade From Factory Rubber Belts

The nitrile belts outlast the original factory rubber belts by maintaining pliability and abrasion resistance over time. The jump is worth it when an existing belt has stretched, cracked or lost grip on the standard Model T or MP-1 tumbler. They will not fit older thin models that use a one-eighth inch belt, so verify the tumbler style before ordering. A fresh set restores consistent rotation for tumbling operations.

Suits Standard Model T And MP-1 Owners

Hobbyists running current Thumler's Model T or MP-1 tumblers gain a long-life spare supply with this pack. Builders with vintage thin-model tumblers or machines requiring a different belt thickness should look elsewhere. The product is limited to the specific quarter-inch O-ring profile and does not adapt to other brands or belt cross-sections. Buyers needing a different diameter or material must source an alternative.

How it compares

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

Price $10.99
Cheaper than about 92% of the 236 comparable items (median $28.99).

Specifications

Product
Product colorBlack
Product typeScience
More details
Age groupAdult
Suitable forUnisex

Questions about this item

Will these belts fit the 1/4" thick drive pulley on my Thumler's Model T tumbler?

Yes, the pack is made for the new-style Model T and MP-1 tumblers that use a 1/4" thick belt; they will not fit the older thin models that take a 1/8" belt.

Do I need to stretch the Buna Nitrile O-ring over the motor shaft or can I roll it on?

Roll the belt onto the pulleys rather than stretching it over the motor shaft; the nitrile material has greater flexibility but forcing it can damage the belt edges.

How long can I keep the spare belts in storage before they lose elasticity?

The manufacturer rates the Buna Nitrile belts for a 15 year shelf life and they stay pliable down to -20 F, so spares remain ready for years.

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