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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Diameter | 1 1/4" |
| Bore Size | 1 1/4" |
| Bore Type | Finished Bore |
| Chain Number | 40 |
| Chain Pitch | 1/2" |
| Chain Size | #40 |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 1 1/4" |
| For Chain Number | 40 |
| For Chain Pitch | 1/2" |
| Hardened Teeth | 1 |
| Hub Configuration | B |
| Hub Diameter | 2 3/4" |
| Hub Outside Dia. | 2 3/4" |
| Individually Packaged | Yes |
| Keyway Size | 1/4" x 1/8" |
| Length Through Bore | 1" |
| Length Thru Bore | 1" |
| Material | Steel |
| Max. Bore Size | 1 7/8" |
| Min. Bore Size | 1 1/4" |
| No. Of Teeth | 21 |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 21 |
| Outside Dia. | 3.617" |
| Pitch | 1/2" |
| Pitch Dia. | 3.3548" |
| Pitch Diameter | 3.355" |
| Screw Size | 0.313"-18 x 0.313" |
| Set Screw Location | (1) Over Keyway And (1) At 90° |
| Set Screw Size | 5/16"-18 |
| Set Screw Thread Type | Coarse |
| Single Strand Tooth Thickness | 0.284" |
| Storage Dimension Height | 1.06" |
| Storage Dimension Length | 4 5/16" |
| Storage Dimension Width | 4 5/16" |
| Type | Bored to Size Type BS |
Shipping Info:
| Ship weight (kg) | 0.66 |
| Ship height (cm) | 2.69 |
| Ship length (cm) | 9.19 |
| Ship width (cm) | 9.19 |
| Country of Origin | US |
Product Variants
| Product | Model | Number Of Teeth | Pitch Dia. | Outside Dia. | Length Through Bore | Set Screw Size | Set Screw Location | Bore Size | For Chain Pitch | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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40BS9HT 1/2 | 9 | 1.4619" | 1.674" | 7/8" | #10-24 | (1) Over Keyway And (1) At 90° | 1/2" | 1/2" | €44.55 | |
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40BS10HT 1/2 | 10 | 1.618" | 1.839" | 7/8" | 1/4"-20 | (2) 90° Apart (No Keyway) | 1/2" | 1/2" | €47.07 | |
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40BS11HT 1/2 | 11 | 1.7747" | 2.003" | 7/8" | #10-24 | (1) Over Keyway And (1) At 90° | 1/2" | 1/2" | €49.62 | |
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40BS12HT 1/2 | 12 | 1.9319" | 2.166" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 1/2" | €54.99 | |
![]() |
40BS13HT 1/2 | 13 | 2.0893" | 2.329" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 1/2" | €57.24 | |
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40BS14HT 1/2 | 14 | 2.247" | 2.491" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 1/2" | €60.64 | |
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40BS15HT 1/2 | 15 | 2.4049" | 2.652" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 1/2" | €65.12 |
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MARTIN SPROCKET 40BS21HT 1 1/4 Roller Chain Sprocket, 1.250 Inch Bore, 3.617 Inch Outside Dia. Steel, Hardened
€96.53 /unit






