Illustrative drawing. Actual product is confirmed to your specification at quotation.
Sprockets
Idler Sprockets
Idler sprockets run on a bearing or bush, not on a keyed shaft. They guide and tension chain, take up slack and change chain direction. Tell us the chain number, teeth and bearing bore.
- Bearing or bush in the bore
- Guides and tensions chain
- Plate or hub types
Specifications
- Material
- Mild steel (C45)Cast iron
- Type
- Plate idlerBearing idler
- Size / section / duty
- Up to 12.7 mm pitch15.875 to 25.4 mm pitch31.75 to 50.8 mm pitch
- Standards
- ANSI B29.1ISO 606
Exact sizes, brands and availability are confirmed at quotation. Send the code or a photo of the old part.
Applications
- Chain tensioning
- Changing chain direction
- Conveyor guide and tail positions
- Taking up slack in long drives
Technical reference
Sprocket pitch diameter by number of teeth
| Teeth | 12.7 mm pitch | 15.875 mm pitch | 19.05 mm pitch | 25.4 mm pitch |
|---|---|---|---|---|
| 13 | 53.1 | 66.3 | 79.6 | 106.1 |
| 15 | 61.1 | 76.4 | 91.6 | 122.2 |
| 17 | 69.1 | 86.4 | 103.7 | 138.2 |
| 19 | 77.2 | 96.4 | 115.7 | 154.3 |
| 21 | 85.2 | 106.5 | 127.8 | 170.4 |
| 23 | 93.3 | 116.6 | 139.9 | 186.5 |
| 25 | 101.3 | 126.7 | 152 | 202.7 |
| 30 | 121.5 | 151.9 | 182.2 | 243 |
| 38 | 153.8 | 192.2 | 230.7 | 307.6 |
Calculated from the standard formula PD = pitch / sin(180° / teeth). Shown for 12.7, 15.875, 19.05 and 25.4 mm pitch chains (ANSI 40, 50, 60, 80 / ISO 08B, 10B, 12B, 16B). Values in mm.
Related and matching products
Request a quote for Idler Sprockets
Give us the code, size, brand and quantity, or a photo of the old part. We reply within one business day.
Common questions
- Which sizes of idler sprockets do you supply?
- We supply idler sprockets across the size range (Up to 12.7 mm pitch, 15.875 to 25.4 mm pitch, 31.75 to 50.8 mm pitch). Send the code, dimensions or a photo of the old part and we confirm the match, availability and lead time at quotation.
- Which standards apply to idler sprockets?
- Common standards are ANSI B29.1, ISO 606. Tell us the standard you need and we will quote to it.
- Which brands can you supply?
- We supply Fenner, PIX and equivalent brands, and can quote alternatives where the application allows. Tell us your preferred brand and we confirm what is available.
- Can you supply in bulk or ship Pan India?
- Yes. We quote for single pieces and scheduled bulk supply, and ship Pan India. Confirm the quantity when you request a quote.
Need a quote on bulk or custom industrial supply?
Share your specifications and quantities — our technical team will respond with pricing and lead time within one business day.