





⚙️ Lock in power and precision — don’t let your machine fall behind!
This 21-tooth roller chain sprocket features a 1/4-inch pitch and 12mm bore, made from hardened C45 carbon steel with a black oxide finish for superior wear and corrosion resistance. Designed as a Type B sprocket with a hub projection and dual set screws, it ensures a secure fit on shafts, making it perfect for demanding industrial power transmission applications.








| Manufacturer | FOCMKEAS |
| Part number | 21T/12mm Bore |
| Item Weight | 75 g |
| Package Dimensions | 12 x 9.3 x 1.7 cm; 75 g |
| Item model number | 21T/12mm Bore |
| Size | 21T/12mm Bore |
| Colour | Black |
| Material | Carbon Steel |
| Item Package Quantity | 1 |
| Teeth Per Inch | 0.25 inches |
| Special Features | single_strand, triple_strand |
| Batteries included? | No |
| Batteries Required? | No |
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