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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Type | Bushed |
| Bushing Part Number | 2012 |
| Chain Number | 40 |
| Chain Pitch | 1/2" |
| Construction | Solid |
| Construction Type | Solid |
| For Chain Number | 40 |
| For Chain Pitch | 1/2" |
| Hardened Teeth | 1 |
| Hub Configuration | B |
| Hub Outside Dia. | 3.4063" |
| Individually Packaged | No |
| Length Through Bore | 1 1/4" |
| Length Thru Bore | 1 1/4" |
| Material | Steel |
| Max. Bore Size | 2" |
| Min. Bore Size | 1/2" |
| Number Of Chain Rows | 2 |
| Number Of Teeth | 25 |
| Outside Dia. | 4.258" |
| Pitch | 1/2" |
| Pitch Dia. | 3.9894" |
| Pitch Diameter | 3.989" |
| Single Strand Tooth Thickness | 0.275" |
| Storage Dimension Height | 1 1/4" |
| Storage Dimension Length | 4.258" |
| Storage Dimension Width | 4.258" |
Shipping Info:
| Ship weight (kg) | 0.73 |
| Ship height (cm) | 3.18 |
| 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 | Bushing Type | For Chain Number | For Chain Pitch | Bore Type | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
D40BTB18H | 18 | 2.8794" | 3.136" | 1" | 1210 Taper Lock | 40 | 1/2" | Bushed | €129.69 | |
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D40BTB19H | 19 | 3.0378" | 3.296" | 1" | 1210 Taper Lock | 40 | 1/2" | Bushed | €133.82 | |
![]() |
D40BTB20H | 20 | 3.1962" | 3.457" | 1" | 1610 Taper Lock | 40 | 1/2" | Bushed | €139.42 | |
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D40BTB21H | 21 | 3.3548" | 3.617" | 1" | 1610 Taper Lock | 40 | 1/2" | Bushed | €143.07 | |
![]() |
D40BTB23H | 23 | 3.672" | 3.938" | 1" | 1610 Taper Lock | 40 | 1/2" | Bushed | €169.11 | |
![]() |
D40BTB30 | 30 | 4.7834" | 5.057" | 1 1/4" | 2012 Taper Lock | 40 | 1/2" | Bushed | €179.56 | |
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D40BTB36 | 36 | 5.7369" | 6.015" | 1 1/4" | 2012 Taper Lock | 40 | 1/2" | Bushed | €225.29 |
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Contact us
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MARTIN SPROCKET D40BTB25H Sprocket, Taper, 40 Chain, 25 Teeth, 3.989 Inch Pitch Dia., 4.258 Inch O.D., Steel
€171.77 /unit







