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- 28B-2 Chain Number
- 2 Strands
- 21 Teeth
- Without Hardened Teeth
- B Sprocket Style
description
- Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat.
features
- Manufactured of high carbon steel
- Precise machining and processes ensure consistent finish and high quality
- Bores are concentric to pitch line, minimizing run out
- Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain
| Material | Steel |
| Pin Diameter | 27.94 mm |
| No. of Teeth | 21 |
| Sprocket Style | B |
| Hardened Teeth | Without Hardened Teeth |
| Family Name | No. 28 - 44.450 mm Pitch - Double - Type B & C |
| Series | B |
| Width Across Teeth | 88.39 mm |
| Bore Type | Reborable |
| Pitch Diameter | 298.2 mm |
| Pitch Diameter [Min] | 298.2 mm |
| Chain Pitch | 44.45 mm |
| Bore Range [Min] | 40 mm |
| Inch/Metric | Metric |
| No. of Strands Across | 2 |
| Chain No. | 28B, 28B-2 |
| Single Strand Tooth Thickness | 28.83 mm |
| Pitch Root Diameter | 270.3 mm |
| Martin No. | 28B21 |
| Root Diameter | 270.3 mm |
| Outside Dia. [Min] | 325.86 mm |
| Bore Style | Minimum Bore |
| Caliper Diameter | 269.46 mm |
| Outside Dia. | 325.86 mm |
| Length Through Bore | 120.02 mm |
| Bore Range [Max] | 126 mm |
| Hub Length Thru | 90.64 mm |
| Hub Dia. | 178 mm |
| Weight | 102.9 LB |
| EAN or UPC | 697950407265 |
