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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Type | Finished Bore |
| Chain Number | 40 |
| Chain Pitch | 1/2" |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 5/8" |
| For Chain Number | 40 |
| For Chain Pitch | 1/2" |
| Hub Configuration | B |
| Hub Diameter | 2 3/4" |
| Hub Outside Dia. | 2 3/4" |
| Individually Packaged | No |
| Length Through Bore | 1" |
| Length Thru Bore | 1" |
| Material | Stainless Steel |
| Max. Bore Size | 1 7/8" |
| Min. Bore Size | 5/8" |
| No. Of Teeth | 21 |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 21 |
| Outside Dia. | 3.618" |
| Pitch | 1/2" |
| Pitch Dia. | 3.355" |
| Product Datasheet | martin-sprocket-100a10.pdf |
| Single Strand Tooth Thickness | 0.284" |
| Storage Dimension Height | 1" |
| Storage Dimension Length | 3.778" |
| Storage Dimension Width | 3.778" |
Shipping Info:
| Ship weight (kg) | 0.8 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 9.19 |
| Ship width (cm) | 9.19 |
| Country of Origin | US |
Documentation:
Product Variants
| Product | Model | Number Of Teeth | Pitch Dia. | Outside Dia. | Length Through Bore | Set Screw Size | For Chain Pitch | For Chain Number | Bore Type | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
40B8 | 8 | 1.3066" | 1.507" | 7/8" | - | 1/2" | 40 | Finished Bore | €23.84 | |
![]() |
40B9 | 9 | 1.4619" | 1.674" | 7/8" | - | 1/2" | 40 | Finished Bore | €24.93 | |
![]() |
40B10 | 10 | 1.618" | 1.839" | 7/8" | 3/4"-10 | 1/2" | 40 | Finished Bore | €25.49 | |
![]() |
40B11 | 11 | 1.7747" | 2.003" | 7/8" | - | 1/2" | 40 | Finished Bore | €27.97 | |
![]() |
40B12 | 12 | 1.9319" | 2.166" | 7/8" | - | 1/2" | 40 | Finished Bore | €29.88 | |
![]() |
40B13 | 13 | 2.0893" | 2.329" | 7/8" | - | 1/2" | 40 | Finished Bore | €30.42 | |
![]() |
40B14 | 14 | 2.247" | 2.491" | 7/8" | 1/4"-20 | 1/2" | 40 | Finished Bore | €30.42 |
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MARTIN SPROCKET 40B21SS Roller Chain Sprocket, 40 Chain, 21 Teeth, 3.355 Inch Pitch Dia., 3.618 Inch O.D., SS
€333.36 /unit







