12mm Hex Wheel Adapter for 4mm Shaft (2-Pack)

These 17 mm long aluminium adapters convert a 4 mm diameter shaft to a 12 mm hex shaft that is compatible with many common hobby RC wheels.

AUD$ 5.95

In stock in Australia  

We can ship 443 more in 7-10 days

Our Code: SKU-003354

Supplier Link: [Pololu MPN:2684]



These light-weight aluminium shaft adapters convert a typical motor output shaft into a 12 mm hex shaft that is compatible with many common hobby RC wheels, such as the Dagu Wild Thumper Wheels. The side of each adaptor that mounts to the wheel contains a hole tapped for M4 screws, and the other side of the adaptor mounts to a motor shaft with two M3 set screws. This set includes a pair of adapters, two 8 mm M4 screws, four M3 set screws, and one 1.5 mm Allen wrench for use with the set screws.

The adapters are available in the following versions:

Details for item #2684

12mm Hex Wheel Adapter for 4mm Shaft on a 20D mm Metal Gearmotor

This version of the 12 mm hex adaptor is 17 mm in length and designed to work with 4 mm diameter output shafts, including round and “D” shafts. It works well with our 20D mm metal gearmotors (as shown in the picture above) and 25D mm metal gearmotors. The wheel shown in the above picture is a hobby RC wheel that works with 12mm hex shafts; we do not currently carry this wheel or any other wheels that are compatible with this adaptor.

The diagram below shows the dimensions of this shaft adaptor and is also available as a downloadable PDF (108k pdf)

Dimension diagram of the Pololu 12mm Hex Wheel Adapter for 4mm Shaft. Units are mm over [inches]



Size: 12 mm hex × 17 mm length
Length: 17 mm
Weight: 5.0 g1
Shaft diameter: 4 mm

General specifications

Style: short


For a single adaptor only (without set screws or mounting screw).


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