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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Type | Finished Bore |
| Chain Number | 25 |
| Chain Pitch | 1/4" |
| Construction | Solid |
| Construction Type | Solid |
| Finished Bore Size | 3/8" |
| For Chain Number | 25 |
| For Chain Pitch | 1/4" |
| Hub Configuration | A |
| Individually Packaged | No |
| Length Through Bore | 0.11" |
| Length Thru Bore | 0.1065" |
| Material | Steel |
| Min. Bore Size | 3/8" |
| No. Of Teeth | 28 |
| Number Of Chain Rows | 1 |
| Number Of Teeth | 28 |
| Outside Dia. | 2.369" |
| Pitch | 1/4" |
| Pitch Dia. | 2.2329" |
| Product Datasheet | martin-sprocket-100a10.pdf |
| Single Strand Tooth Thickness | 0.11" |
| Storage Dimension Height | 0.11" |
| Storage Dimension Length | 2.369" |
| Storage Dimension Width | 2.369" |
Shipping Info:
| Ship weight (kg) | 0.05 |
| Ship height (cm) | 0.28 |
| Ship length (cm) | 6.02 |
| Ship width (cm) | 6.02 |
| Country of Origin | US |
Documentation:
Product Variants
| Product | Model | Number Of Teeth | Pitch Dia. | Outside Dia. | For Chain Number | For Chain Pitch | Bore Type | Length Through Bore | Pitch | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
25A18 | 18 | 1.4397" | 1.568" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €28.78 | |
![]() |
25A19 | 19 | 1.5189" | 1.648" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €29.04 | |
![]() |
25A20 | 20 | 1.5981" | 1.728" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €29.04 | |
![]() |
25A21 | 21 | 1.6774" | 1.809" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €29.33 | |
![]() |
25A22 | 22 | 1.7567" | 1.889" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €29.62 | |
![]() |
25A23 | 23 | 1.836" | 1.969" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €30.15 | |
![]() |
25A24 | 24 | 1.9153" | 2.049" | 25 | 1/4" | Finished Bore | 0.11" | 1/4" | €30.42 |
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MARTIN SPROCKET 25A28 Sprocket, 25 Chain, 28 Teeth, 2.233 Inch Pitch Dia., 2.369 Inch O.D., Steel
€32.89 /unit






