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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Diameter | 1 7/16" |
| Bore Size | 1 7/16" |
| Bore Type | Finished Bore |
| Chain Number | 40 |
| Chain Pitch | 1/2" |
| Chain Size | #40 |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 1 7/16" |
| For Chain Number | 40 |
| For Chain Pitch | 1/2" |
| Hub Configuration | B |
| Hub Diameter | 3 1/4" |
| Hub Outside Dia. | 3 1/4" |
| Individually Packaged | Yes |
| Keyway Size | 3/8" x 3/16" |
| Length Through Bore | 1" |
| Length Thru Bore | 1" |
| Material | Steel |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 25 |
| Outside Dia. | 4.258" |
| Pitch | 1/2" |
| Pitch Dia. | 3.9894" |
| Pitch Diameter | 3.989" |
| Screw Size | 3/8"-16 x 3/8" |
| Set Screw Location | (1) Over Keyway And (1) At 90° |
| Set Screw Size | 3/8"-16 |
| 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) | 0.98 |
| Ship height (cm) | 2.69 |
| Ship length (cm) | 10.82 |
| Ship width (cm) | 10.82 |
| 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 Number | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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40BS9 1/2 | 9 | 1.4619" | 1.674" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €29.33 | |
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40BS10 1/2 | 10 | 1.618" | 1.839" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €30.42 | |
![]() |
40BS11 1/2 | 11 | 1.7747" | 2.003" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €31.80 | |
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40BS12 1/2 | 12 | 1.9319" | 2.166" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €34.80 | |
![]() |
40BS13 1/2 | 13 | 2.0893" | 2.329" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €36.45 | |
![]() |
40BS14 1/2 | 14 | 2.247" | 2.491" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €38.36 | |
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40BS15 1/2 | 15 | 2.4049" | 2.652" | 7/8" | #10-24 | (2) 90° Apart (No Keyway) | 1/2" | 40 | €41.36 |
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Contact us
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MARTIN SPROCKET 40BS25 1 7/16 Roller Chain Sprocket, Bore To Size, 1.438 Inch Bore, 4.258 Inch Outside Dia. Steel
€90.95 /unit







