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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Diameter | 1/4" |
| Bore Type | Finished Bore |
| Chain Number | 25 |
| Chain Pitch | 1/4" |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 1/4" |
| For Chain Number | 25 |
| For Chain Pitch | 1/4" |
| Hub Configuration | B |
| Hub Diameter | 1 3/8" |
| Hub Outside Dia. | 1 3/8" |
| Individually Packaged | Yes |
| Length Through Bore | 5/8" |
| Length Thru Bore | 5/8" |
| Material | Steel |
| Max. Bore Size | 7/8" |
| Min. Bore Size | 1/4" |
| No. Of Teeth | 21 |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 21 |
| Outside Dia. | 1.809" |
| Pitch | 1/4" |
| Pitch Dia. | 1.6774" |
| Single Strand Tooth Thickness | 0.11" |
| Storage Dimension Height | 13/16" |
| Storage Dimension Length | 1 15/16" |
| Storage Dimension Width | 1 15/16" |
Shipping Info:
| Ship weight (kg) | 0.12 |
| Ship height (cm) | 1.6 |
| Ship length (cm) | 4.6 |
| Ship width (cm) | 4.6 |
| Country of Origin | US |
Product Variants
| Product | Model | Number Of Teeth | Pitch Dia. | Outside Dia. | Length Through Bore | For Chain Number | For Chain Pitch | Bore Type | Pitch | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
25B9 | 9 | 0.731" | 0.837" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €21.93 | |
![]() |
25B10 | 10 | 0.809" | 0.919" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €22.47 | |
![]() |
25B11 | 11 | 0.8874" | 1.001" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €23.02 | |
![]() |
25B12 | 12 | 0.9659" | 1.083" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €23.84 | |
![]() |
25B14 | 14 | 1.1235" | 1.245" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €25.49 | |
![]() |
25B15 | 15 | 1.2024" | 1.326" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €25.49 | |
![]() |
25B16 | 16 | 1.2815" | 1.407" | 1/2" | 25 | 1/4" | Finished Bore | 1/4" | €25.98 |
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MARTIN SPROCKET 25B21 Sprocket, 25 Chain, 21 Teeth, 1.677 Inch Pitch Dia., 1.809 Inch O.D., Steel
€29.88 /unit







