Find a Service Center
- 20B-3 Chain Number
- 3 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
| No. of Teeth | 21 |
| Pitch Diameter [Min] | 213 mm |
| O.D. | 9.199 in |
| Pin Diameter | 19.05 mm |
| Bushing Bore Size [Max] | 3.858 in |
| Chain Sprocket Pitch | 1.25 in |
| Martin No. | 20B21 |
| Bore Style | Minimum Bore |
| Bore Range [Min] | 25 mm |
| No. of Teeth Rows Strands | 3 |
| Bore Type | Finished Bore |
| Hardened Teeth | Without Hardened Teeth |
| Bore Size [Max] | 3.858 in |
| Outside Dia. [Min] | 233.66 mm |
| Material Internal Use | Carbon Steel |
| Sprocket Style | B |
| Stock Bore Size | 25 mm |
| Material | Steel |
| Pitch Diameter | 213 mm |
| Root Diameter | 194 mm |
| Construction Internal | Solid |
| Bushing Bore Size [Min] | 0.984 in |
| Bore Size [Min] | 0.984 in |
| No. of Strands Across | 3 |
| Hub O.D. | 5.512 in |
| Chain Sprocket Number | 20B |
| Inch/Metric | Metric |
| Length Through Bore | 4.528 in |
| Width Across Teeth | 91.08 mm |
| Bushing Bore [Min] | 0.984 in |
| Pitch Root Diameter | 194 mm |
| Width Across Teeth Rows | 3.576 in |
| Chain No. | 20B, 20B-3 |
| Single Strand Tooth Thickness | 0.716 in |
| Hub Dia. | 140 mm |
| Hub Length Thru | 96.81 mm |
| Outside Dia. | 233.66 mm |
| Pitch Dia. | 8.387 in |
| Series | B |
| Material External Use | Steel |
| Family Name | No. 20 - 31.750 mm Pitch - Triple - Type B & C |
| Chain Pitch | 31.75 mm |
| Bore Range [Max] | 98 mm |
| Caliper Diameter | 193.38 mm |
| Weight | 51.5 LB |
| EAN or UPC | 697950405292 |
