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- 40 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
- Tolerances meet or exceed ANSI standards
- Manufactured of high carbon steel
- Precise machining and processes ensure consistent finish and high quality
- Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain
- Bores are concentric to pitch line, minimizing run out
- Interchangeable with other manufacturers’ split-taper bushings
| Single Strand Tooth Thickness | 0.275 in |
| Bore Style | Minimum Bore |
| Hardened Teeth | With Hardened Teeth |
| Pitch Diameter [Min] | 3.350 in |
| Hub Projection | 0.788 in |
| Bore Type | Reborable |
| No. of Teeth | 21 |
| Outside Dia. | 3.6170 in |
| Keyway | No Keyway or Setscrew |
| Hub Dia. | 2 3/4 in |
| Caliper Diameter | 3.033 in |
| Pitch Diameter | 3.350 in |
| Width Across Teeth | 0.837 in |
| Sprocket Style | B |
| Chain No. | 40 |
| Material | Steel |
| Series | B |
| Hub Length Thru | 1.35 in |
| Bore Range [Min] | 5/8 in |
| Length Through Bore | 1 5/8 in |
| Martin No. | 40B21H |
| Chain Pitch | 1/2 in |
| Bore Range [Max] | 1 7/8 in |
| Inch/Metric | Inch |
| No. of Strands Across | 2 |
| Outside Dia. [Min] | 3.6170 in |
| Weight | 2.94 LB |
| EAN or UPC | 697950007182 |
