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1081-POLOLU Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 4 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4-40 screws (not included).
We have an assortment of universal mounting hubs available, spanning several shaft sizes and featuring mounting holes threaded for metric or imperial screws.
These universal mounting hubs are designed to work with most 4 mm diameter shafts, including round shafts, and “D” shafts. Each of the two included hubs has four mounting holes for #4-40 screws (not included), letting you mount custom wheels or mechanisms to your motors. The two included #4-40 hex set screws (one for each hub) allow secure coupling of shaft to hub, and a 0.05″ hex wrench (often the smallest size in SAE Allen wrench sets) is included for use with the set screws. A dimension diagram of the hub is available under the resources tab.
The picture to the right shows a hub with Pololu’s 25:1 metal gearmotor 20Dx44L mm and a Pololu 20D mm metal gearmotor bracket. These hubs will work with any Pololu 20D mm metal gearmotor or 25D mm metal gearmotor, and they also work with 60 mm, 70 mm, 80 mm, and 90 mm Pololu wheels.
Dimensions
| Size: | 19 mm diameter × 5 mm thick |
|---|---|
| Weight: | 3.2 g1 |
| Shaft diameter: | 4 mm |
| Mounting hole size: | #4-402 |
Notes:
- 1. For a single hub only (without set screw).
- 2. This is also the size of the set screw.
|
SKU
|
Product
|
Size
|
Weight (g)
|
Shaft diameter (mm)
|
Mounting hole size
|
|---|---|---|---|---|---|
| 1993-POLOLU | Universal Aluminum Mounting Hub for 1/4″ Shaft, #4-40 Holes (2-Pack) | 25.4 mm diameter × 9.2 mm thick | 6.71 | 6.35 | #4-402 |
| 1994-POLOLU | Universal Aluminum Mounting Hub for 1/4″ Shaft, M3 Holes (2-Pack) | 25.4 mm diameter × 9.2 mm thick | 6.71 | 6.35 | M32 |
| 1999-POLOLU | Universal Aluminum Mounting Hub for 6mm Shaft, M3 Holes (2-Pack) | 25.4 mm diameter × 9.2 mm thick | 6.81 | 6 | M32 |
| 1998-POLOLU | Universal Aluminum Mounting Hub for 5mm Shaft, M3 Holes (2-Pack) | 19 mm diameter × 5 mm thick | 3.23 | 5 | M34 |
| 1997-POLOLU | Universal Aluminum Mounting Hub for 4mm Shaft, M3 Holes (2-Pack) | 19 mm diameter × 5 mm thick | 3.23 | 4 | M34 |
| 1996-POLOLU | Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack) | 17.5 mm diameter × 5 mm thick | 2.83 | 3 | M34 |
| 1081-POLOLU | Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack) | 19 mm diameter × 5 mm thick | 3.23 | 4 | #4-404 |
| 1079-POLOLU | Universal Aluminum Mounting Hub for 3mm Shaft, #2-56 Holes (2-Pack) | 17.5 mm diameter × 5 mm thick | 2.83 | 3 | #2-565 |
Notes:
- 1. For a single hub only (without set screws).
- 2. This is also the size of the set screws.
- 3. For a single hub only (without set screw).
- 4. This is also the size of the set screw.
- 5. The set screw is #4-40.
WARNING
