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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Diameter | 3/4" |
| Bore Type | Finished Bore |
| Chain Number | 50 |
| Chain Pitch | 5/8" |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 3/4" |
| For Chain Number | 50 |
| For Chain Pitch | 5/8" |
| Hub Configuration | B |
| Hub Diameter | 3" |
| Hub Outside Dia. | 3" |
| Individually Packaged | Yes |
| Length Through Bore | 1" |
| Length Thru Bore | 1" |
| Material | Steel |
| Max. Bore Size | 2" |
| Min. Bore Size | 3/4" |
| No. Of Teeth | 21 |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 21 |
| Outside Dia. | 4.522" |
| Pitch | 5/8" |
| Pitch Dia. | 4.1934" |
| Single Strand Tooth Thickness | 0.343" |
| Storage Dimension Height | 1 1/16" |
| Storage Dimension Length | 4 5/8" |
| Storage Dimension Width | 4 5/8" |
Shipping Info:
| Ship weight (kg) | 1.09 |
| Ship height (cm) | 2.7 |
| Ship length (cm) | 11.48 |
| Ship width (cm) | 11.48 |
| Country of Origin | US |
Product Variants
| Product | Model | Pitch Dia. | Number Of Teeth | Outside Dia. | Length Through Bore | Set Screw Size | For Chain Number | For Chain Pitch | Bore Type | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
50B8 | 1.6332" | 8 | 1.884" | 1" | - | 50 | 5/8" | Finished Bore | €33.41 | |
![]() |
50B9 | 1.8274" | 9 | 2.092" | 1" | - | 50 | 5/8" | Finished Bore | €33.99 | |
![]() |
50B10 | 2.023" | 10 | 2.299" | 1" | - | 50 | 5/8" | Finished Bore | €37.25 | |
![]() |
50B11 | 2.218" | 11 | 2.504" | 1" | - | 50 | 5/8" | Finished Bore | €39.75 | |
![]() |
50B12 | 2.4148" | 12 | 2.708" | 1" | - | 50 | 5/8" | Finished Bore | €41.36 | |
![]() |
50B13 | 2.6116" | 13 | 2.911" | 1" | - | 50 | 5/8" | Finished Bore | €43.29 | |
![]() |
50B14 | 2.8087" | 14 | 3.113" | 1" | 1/4"-20 | 50 | 5/8" | Finished Bore | €45.21 |
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MARTIN SPROCKET 50B21 Sprocket, Stock Bore, 50 Chain, 21 Teeth, 4.193 Inch Pitch Dia., 4.522 Inch O.D., Steel
€76.20 /unit







