Thumler’s A-R12 Rotary Rock Tumbler
Experienced users processing larger rotary batches
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Single large 12 lb rubber barrel with fan-cooled, overload-protected drive.
Large loaded-barrel weight; demands a suitable, stable work area and more consumables per batch.
Manufacturer specifications
| Brand | Thumler's Tumbler |
|---|---|
| Model / variant | A-R12 |
| Machine type | Rotary |
| Nominal load capacity | 12 lb nominal |
| Barrels / bowls | 1 |
| Barrel / bowl material | Rubber |
| Electrical configuration | Check configuration before ordering |
| Parts and service | Manufacturer publishes an A-R12 parts range. |
Is this tumbler a good fit?
Thumler’s A-R12 Rotary Rock Tumbler is a rotary barrel rock tumbler with 12 lb nominal capacity. It may suit experienced users processing larger rotary batches.
Why consider it: Single large 12 lb rubber barrel with fan-cooled, overload-protected drive.
What to check: Large loaded-barrel weight; demands a suitable, stable work area and more consumables per batch.
These buying notes are based on published product specifications, not hands-on testing. Barrel load capacity includes rock, media, water and grit where applicable. Confirm the exact machine variant and current seller terms before purchasing.
For a typical first batch, check that the manufacturer supports your intended material, the operating voltage matches your location, and replacement barrels or bowls can be obtained. Check the supplied manual for filling, lubrication and cleaning.
Where to find this model
Check model numbers, included accessories and current terms before ordering. Prices and availability are controlled by Amazon sellers.
As an Amazon Associate I earn from qualifying purchases. No exact ASIN or Amazon inventory has been verified for this model.
Source & editorial method
Specifications are summarized from publicly available product descriptions, not reproduced photographs or user reviews. No hands-on testing is claimed.
Manufacturer / primary product reference: www.thumlerstumbler.com ↗
Fact-check date: 2026-10-13. Verify current specifications before purchase.