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40T-15W-8B — 3M Toothed Idler Pulley
40T-15W-8B — 3M Toothed Idler Pulley
A compact bearing-supported idler for guiding a 15mm timing belt around a fixed Ø8mm mounting point. The toothed running surface follows the matching belt teeth, while twin flanges help retain the belt through direction changes and tensioner assemblies.
40T-15W-8B quick reference
3M · 40 teeth · 15mm belt40T Idler dimensional data sheet
NCMASTER English dimension drawing for the Ø8mm bearing-bore listing. The 15mm belt option uses a 17mm groove and 21mm overall width. Select the image to view the full-size drawing.
Why use a 40T toothed idler?
- Guides the toothed side of a matching timing belt around a return path or direction change.
- Provides a rotating contact point for a correctly designed fixed or adjustable tensioner.
- The centre bearing lets the pulley turn around its mounting point without clamping to a drive shaft.
- Twin flanges help keep the belt aligned across the running surface.
- Useful for CNC routers, robotics, positioning stages and general belt-driven automation.
Supplier reference dimensions
| Model | Bearing bore | Belt width | Pitch | Teeth | Tooth OD | Flange OD | Groove width | Overall width |
|---|---|---|---|---|---|---|---|---|
| 40T-15W-8B | Ø8mm | 15mm | 3mm | 40 | Ø37.44mm | Ø42mm | 17mm | 21mm |
Adapted supplier reference • Not to scale. Drawing adapted to this listing’s Ø8mm bearing bore; body dimensions follow the supplier’s 40T idler reference. Bearing appearance is illustrative.
Australia-wide supply
NCMASTER supplies timing-belt hardware for CNC and automation projects, with delivery available across Victoria, New South Wales, Queensland, South Australia, Western Australia, Tasmania, the Australian Capital Territory and the Northern Territory.
Match the belt, drive pulleys and idlers as one compatible system, checking tooth profile, belt width and mounting dimensions before ordering.
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