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.
Thumler's Model A-R12 Belt
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.
A-R12 Tumbler Bearings
Thumler's A-R12 bearings are made of durable polyethylene. Bearings are simple to replace. Remove the retainer ring, slide the old bearing off, put the new one on and replace the retaining ring. We suggest purchasing some extra retainer rings just in case you damage some while taking it off or putting it on.
Thumler's A-R12 Barrel Guides
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 Shaft Retainer Clips
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.
Thumler's Tumbler Nylon Roller
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.
Thumler's Rubber Roller
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.
Thumler's A-R12 Drive Shaft
A replacement drive shaft for the Thumlers A-R12 rotary tumbler. Easily replaced, just remove the belt, remove old shaft, snap the new one in and put the belt back on. Includes all parts: Shaft, bearings, rubber rollers, pulley and retainer rings.
Thumler's A-R12 Idler Shaft
A replacement idler shaft for the Thumlers A-R12 rotary tumbler. This is a complete shaft with all parts included that can be replaced in a matter of seconds.
Thumler's A-R12 Barrel Lid
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 stand by is a good idea.
Thumler's A-R12 Barrel Retaining Clamp
This is a metal retaining clamp for Thumler's A-R12 Tumbler barrel that gives the barrel its watertight seal.
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
Inside (usable space)
A-R12 Tumbler Motor Pulley
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.
Thumler's A-R12 Tumbler Motor
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.
A-R12 Rock Tumbler
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