Rotary Motion Guide
Rotary systems involve rotating mechanical parts such as motors, sprockets, and pulleys. Learn the basics about rotary motion here.
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This shaft is made of 1045 carbon steel and is 8mm in diameter. This is the same diameter as the gearbox output shaft on all our NEMA 17 steppers as well as mid sized DC motors.
If you need to connect this shaft to a motor or another device with a shaft, you can use a shaft coupler:
| Product | Physical Properties | |||||
|---|---|---|---|---|---|---|
| Part Number | Price | Inner Diameter | Material | Coupling Rated Torque | Coupling Rated Speed | Torsional Stiffness |
 Spiral Beam Coupling 8mm - 8mm
|
$3.35 | 8 mm | Aluminium | 10 kg·cm | 8000 RPM | 110 N·m/rad |
 Jaw Coupling Half 8mm Series 12
|
$3.00 | 8 mm | Aluminum | 35.7 kg·cm | 12000 RPM | — |
If you're using a rotary system that requires a lot of torque, you may be interested in pulleys and sprockets. By using a two pulleys or sprockets of different sizes, you can increase the gear ratio of the system. Pulleys and sprockets can also be used to transmit rotation over a long distance. For more guidance on building a transmission system, visit our Rotary Motion Guide. Here is a list of our 8mm bore pulleys and sprockets:
| Product | Physical Properties | ||
|---|---|---|---|
| Part Number | Price | Inner Diameter | Number of Teeth |
 #25 Chain Sprocket with 8mm Bore and 10 Teeth
|
$3.00 | 8 mm | 10 |
 GT2 Idler Pulley 8mm Bore with Spacers
|
$5.50 | 8 mm | 44 |
 GT2 Idler Pulley with 8mm Bore and 44 Teeth
|
$1.75 | 8 mm | 44 |
 GT2 Pulley with 8mm Bore and 22 Teeth
|
$2.75 | 8 mm | 22 |
 GT2 Pulley with 8mm Bore and 32 Teeth
|
$2.50 | 8 mm | 32 |
 GT2 Pulley with 8mm Bore and 44 Teeth
|
$3.00 | 8 mm | 44 |
 GT2 Pulley with 8mm Bore and 60 Teeth
|
$3.00 | 8 mm | 60 |
 GT2 Pulley with 8mm Bore and 80 Teeth
|
$4.00 | 8 mm | 80 |
 GT5 Pulley with 8mm Bore and 12 Teeth
|
$3.00 | 8 mm | 12 |
 GT5 Pulley with 8mm Bore and 24 Teeth
|
$3.15 | 8 mm | 24 |
 GT5 Pulley with 8mm Bore and 34 Teeth
|
$4.45 | 8 mm | 34 |
 GT5 Pulley with 8mm Bore and 50 Teeth
|
$6.70 | 8 mm | 50 |
Systems with heavy loads or pulley/sprocket assemblies often put a lot of sideways strain on the shaft. In such a system, you can use rotary bearings to protect and support the shaft:
| Product | Physical Properties | Mechanical Properties | |||
|---|---|---|---|---|---|
| Part Number | Price | Inner Diameter | Bearing Type | Static Load | Dynamic Load |
 Flanged Rotary Bearing for 8mm Shaft (2pcs)
|
$4.00 | 8 mm | Rotary Shaft (Flanged) | 1.3 kN | 3.3 kN |
 Pillow Block Rotary Bearing for 8mm Shaft (2pcs)
|
$4.25 | 8 mm | Rotary Shaft (Pillow Block) | 1.3 kN | 3.3 kN |
| Physical Properties | |
|---|---|
| Diameter | 8 mm |
| Customs Information | |
| Canadian HS Export Code | 8483.10.00 |
| American HTS Import Code | 8483.10.50.00 |
| Country of Origin | CA (Canada) |