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- 40 Chain Number
- 21 Teeth
- 1 Strand
- QD Bushing
- Without Hardened Teeth
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’ QD bushings
| No. of Strands Across | 1 |
| Length Through Bore | 13/16 in |
| Overall Length Less Threads | N/A |
| Outside Dia. [Min] | 3.6170 in |
| Material | Steel |
| Bore Type | Bushed |
| Pitch Diameter | 3.350 in |
| Type | B |
| Chain No. | 40 |
| Width Across Teeth | 0.284 in |
| Bushing Series | SH |
| Hub Projection | 0.53 in |
| Hub Dia. | 2 3/4 in |
| Sprocket Style | B |
| Bushing Bore [Max] | 1 5/8 in |
| Overall Length | 13/16 in |
| Bushing Bore [Min] | 1/2 in |
| Tooth Width | 0.284 in |
| Single Strand Tooth Thickness | 0.284 in |
| Outside Dia. | 3.6170 in |
| Hardened Teeth | Without Hardened Teeth |
| Caliper Diameter | 3.03 in |
| Martin No. | 40SH21 |
| Bushing Type | QD |
| Inch/Metric | Inch |
| No. of Teeth | 21 |
| Screw Size | 1/4-20 UNC |
| Hub Length | 0.53 in |
| Chain Pitch | 1/2 in |
| Weight | 0.82 LB |
| EAN or UPC | 697950005119 |
