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Product Specifications:
| Item | Sprocket |
| Bore Dia. | 3/4" to 2" |
| Chain Size | #820 |
| Length Through Bore | 1 11/16" |
| Material | Cast Iron |
| No. Of Teeth | 31 |
| Pitch Dia. | 7.452" |
| Product Datasheet | martin-sprocket-100a10.pdf |
| Series | 800 Series |
| Type | Arm Body |
Shipping Info:
| Ship weight (kg) | 3.74 |
| Ship height (cm) | 4.29 |
| Ship length (cm) | 19.13 |
| Ship width (cm) | 19.13 |
| Country of Origin | US |
Documentation:
Product Variants
| Product | Model | Pitch Dia. | No. Of Teeth | Length Through Bore | Type | Bore Dia. | Chain Size | Material | Series | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
820A25 | 6.032" | 25 | 1 11/16" | Arm Body | 3/4" to 2" | #820 | Cast Iron | 800 Series | €267.81 | |
![]() |
820A21 | 5.089" | 21 | 1 11/16" | Arm Body | 3/4" to 1 3/4" | #820 | Cast Iron | 800 Series | €250.39 | |
![]() |
820A13B | 3.228" | 13 | 1 11/16" | Block Body | 3/4" to 1 1/4" | #820 | Cast Iron | 800 Series | €196.81 | |
![]() |
820A23 | 5 14/25" | 23 | 1 11/16" | Arm Body | 3/4" to 1 3/4" | #820 | Cast Iron | 800 Series | €265.96 | |
![]() |
820A24 | 5.796" | 24 | 1 11/16" | Arm Body | 3/4" to 1 3/4" | #820 | Cast Iron | 800 Series | €267.81 | |
![]() |
820A19 | 4.62" | 19 | 1 11/16" | Arm Body | 3/4" to 1 1/4" | #820 | Cast Iron | 800 Series | €233.87 | |
![]() |
820A20 | 4.854" | 20 | 1 11/16" | Arm Body | 3/4" to 1 1/4" | #820 | Cast Iron | 800 Series | €250.39 |
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MARTIN SPROCKET 820A31 Sprocket, 31 Teeth, Cast Iron
€410.60 /unit



