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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Dia. | 3/4" |
| Bore Type | Finished Bore |
| Chain Number | 50 |
| Chain Pitch | 5/8" |
| Chain Size | #50 |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 3/4" |
| For Chain Number | 50 |
| For Chain Pitch | 5/8" |
| Hub Configuration | B |
| Hub Dia. | 3" |
| Hub Outside Dia. | 3" |
| Individually Packaged | Yes |
| Length Thru Bore | 1" |
| Material | Steel |
| Max. Bore Size | 2" |
| Min. Bore Size | 3/4" |
| No. Of Chain Rows | 1 |
| No. Of Teeth | 21 |
| Outside Dia. | 4.522" |
| Pitch | 5/8" |
| Pitch Dia. | 4.193" , 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" |
| Type | Stock Bore Type B |
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 | Material | Pitch Dia. | No. Of Teeth | Length Through Bore | Hub Dia. | Bore Dia. | Storage Dimension Length | Storage Dimension Width | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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50B8 | Steel | 1.6332" | 8 | 1" | 1 1/8" | 5/8" | 2 1/16" | 2 1/16" | €33.41 | |
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50B9 | Steel | 1.8274" | 9 | 1" | 1 3/8" | 5/8" | 2 1/8" | 2 1/8" | €33.99 | |
![]() |
50B10 | Steel | 2.023" | 10 | 1" | 1.562" | 5/8" | 4.0833" | 4.0833" | €37.25 | |
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50B11 | Steel | 2.218" | 11 | 1" | 1 3/4" | 5/8" | 2 9/16" | 2 9/16" | €39.75 | |
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50B12 | Steel | 2.415" | 12 | 1" | 1.984" | 5/8" | 3 1/4" | 3 1/4" | €41.36 | |
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50B13 | Steel | 2.612" | 13 | 1" | 1 7/8" | 5/8" | 3 1/4" | 3 1/4" | €43.29 | |
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50B14 | Steel | 2.809" | 14 | 1" | 2 1/8" | 5/8" | 3 1/4" | 3 1/4" | €45.21 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
MARTIN SPROCKET 50B21 Sprocket, Stock Bore, 50 Chain, 21 Teeth, 4.193 Inch Pitch Dia., 4.522 Inch O.D., Steel
€76.20 /unit







