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Thumler's Model A-R12 Tumbler Parts

A-R12 Rock Tumbler
We sell replacement motors, bearings, guides, shafts, retainer clips, barrels, retainer rings and lids. To purchase a complete machine or get more information, visit our A-R12 tumbler page.
Rock Tumbler Supplies
Rock Tumbler Supplies
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Belt for Thumler's tumblers

Thumler's Model A-R12 Belt

Only $6.99
Replacing a broken A-R12 belt is an easy job that requires no tools. Having an extra belt around is good practice so when one breaks you don't have to wait for one in the mail to continue tumbling.
Thumler's tumbler bearings

A-R12 Tumbler Bearings

Four for $7.99
Thumler's A-R12 bearings are made of durable polyethylene. Bearings are simple to replace. Remove the retainer clip, slide the old bearing off, put the new one on, and replace the retainer clip. We suggest purchasing some extra retainer clips just in case you damage some while removing or replacing them.
3-in-one oil

Stop Squeaky Bearings

Only $4.99
We oil our Thumler's Tumblers every 30 days (or after each batch of rocks) with 3-IN-ONE Multi-Purpose Oil or SAE20 motor oil. Only one drop on each bearing. See our article for photos and detailed instructions.

Needle-Tip Oil Bottle

$3.99 Each
Have your own SAE20 motor oil or general purpose oil? Use one of these needle-tip bottles to accurately dispense it on tumbler bearings and motors. Keep your tumbler running smooth and quiet.
Thumler's nylon guides

Thumler's A-R12 Barrel Guides

2 for $3.99
Thumler's A-R12 tumbler barrel guides are made of nylon which makes them durable. You won't have to change these very often but when you do it is a simple job. Remove the retainer clip, remove the bearing and old guide, slide on a new guide and replace the bearing and retainer clip. Purchasing some extra retainer clips in case you damage one is a good idea.
Thumler's tumbler retainer clip

Thumler's Shaft Retainer Clips

4 for $3.99
Retainer clips are used to hold the bearings on the end of the shafts and to hold the nylon rollers in the proper location on the idler shaft.
Nylon rollers for Thumler's tumbler idler shaft

Thumler's Tumbler Nylon Roller

2 for $3.99
3 for $4.99
After years of use, the nylon rollers on the idler shaft may wear down and need to be replaced. We offer a set of two rollers for the A-R1 and A-R6 tumblers and a set of three rollers for the A-R2 and A-R12 tumblers. Roller replacement is simple - just remove the old rollers from the idler shaft and slide the new rollers into their place.
Rubber roller for Thumler's tumbler drive shaft

Thumler's Rubber Roller

2 for $3.99
3 for $4.99
These rubber rollers for the drive shaft are what give the barrel traction and keep it turning to tumble the rocks inside. Replace worn rollers for optimum tumbling action. A set of two rubber rollers is needed for the A-R1 and A-R6 tumblers while a set of three rollers is needed for the A-R2 and A-R12 tumblers.
Drive pulley for Thumler's drive shaft

Thumler's A-R12 Drive Pulley

Only $8.99
If the pulley on the drive shaft of your A-R12 gets damaged, this part will replace it. This drive pulley will also fit any of the following tumblers: Thumler's MP-1, A-R1, A-R2, A-R6, Model B, Model T, and Model T2.
Thumler's AR2 and AR12 tumbler drive shaft

Thumler's A-R12 Drive Shaft

Only $19.99
A replacement drive shaft for the Thumler's A-R12 rotary tumbler. Easily replaced; just remove the belt, remove the old shaft, snap the new one in, and put the belt back on. Includes all parts: Shaft, bearings, rubber rollers, pulley and retainer clips.
Thumler's AR2 and AR12 tumbler idler shaft

Thumler's A-R12 Idler Shaft

Only $14.99
A replacement idler shaft for the Thumler's A-R12 rotary tumbler. This is a complete shaft with all parts included that can be replaced in a matter of seconds.
Thumler's 12lb barrel lid

Thumler's A-R12 Barrel Lid

Only $8.99
This plastic lid fits the Model A-R12 barrel and has a 12-pound tumbling capacity. Over time these plastic lids will wear through in the center, so having an extra one on standby is a good idea.
Thumler's 12lb barrel retainer clamp

Thumler's A-R12 Barrel Retaining Clamp

Only $7.99
This is a metal retaining clamp for Thumler's A-R12 Tumbler barrel that gives the barrel its watertight seal.
Thumler's 12lb tumbler barrel

Thumler's A-R12

Only $189.99
This large 12-pound capacity hexagon barrel was designed for Thumler's Model A-R12 rock tumbler. It is a complete barrel that includes the soft rubber barrel, plastic lid and sealing ring.

Barrel Dimensions in Inches
  Height Diameter
Inside (usable space) 7 3/8 5 3/4
Outside 8 1/4 8 5/16

Thumlers A-R motor pully

A-R12 Tumbler Motor Pulley

Only $7.99
This pulley fits the motor on the A-R12 Thumler's Tumbler. This Thumler's A-R12 pulley has a 1/4" bore diameter and 3/4" outside diameter.
Thumlers tumbler motor

Thumler's A-R12 Tumbler Motor and Pulley

We don't know when this motor will be available.More Information
This Thumler's A-R12 rock tumbler motor is thermally protected. It will automatically shut off if it gets too hot. This motor is very easy to hook up and get back to tumbling.
Thumlers keps nuts

Thumler's A-R12 Motor Mounting Nuts

2 for $2.99
Two keps nuts (nuts with attached, free spinning, star-shaped lock washers) are used to keep the motor in place. They screw onto the two motor-mounting bolts where they extend through the motor-mounting brackets.
A-R12 rotary tumbler

A-R12 Rock Tumbler

MSRP $348.17
Our Price: $229.99

Adult signature required upon delivery.

Tumbler Only
Thumler's A-R12 rotary rock tumbler can process about 8 pounds of rough into polished gemstones. It can easily be converted to run two 3-pound barrels by moving the idler shaft. 3-pound barrels sold separately. More Information

Rock Tumbler Supplies
Rock Tumbler Supplies
Rock tumbler grit Rock tumbler rough Rock tumbling media Rock tumbler grit Rock tumbler rough Rock tumbling media Rock Tumbling Supplies