Find a Service Center
- 40 Chain Number
- 21 Teeth
- 1 Strand
- QD Bushing
- With Hardened Teeth
description
- Hardened teeth on the smaller sprocket of a roller chain drive are recommended if the drive ratio is four to one or greater or if the smaller sprocket has 24 teeth or less and is running at a speed of over 600 rpm.
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
- Stocked Heat Treat
| Inch/Metric | Inch |
| Hub Dia. | 2 3/4 in |
| Single Strand Tooth Thickness | 0.284 in |
| Bushing Bore [Min] | 0.5 in |
| Overall Length Less Threads | N/A |
| Chain Pitch | 0.5 in |
| Outside Dia. | 3.617 in |
| Caliper Diameter | 3.0334 in |
| Hub Projection | 0.53 in |
| Bushing Series | SH |
| Screw Size | 1/4-20 UNC |
| Material | Steel |
| Bore Type | Bushed |
| Chain No. | 40 |
| Tooth Width | 0.284 in |
| Overall Length | 0.8125 in |
| Type | B |
| No. of Strands Across | 1 |
| Sprocket Style | B |
| Bushing Bore [Max] | 1.625 in |
| Martin No. | 40SH21H |
| Outside Dia. [Min] | 3.617 in |
| Hub Length | 0.53 in |
| No. of Teeth | 21 |
| Hardened Teeth | With Hardened Teeth |
| Bushing Type | QD |
| Pitch Diameter | 3.3548 in |
| Length Through Bore | 0.8125 in |
| Width Across Teeth | 0.284 in |
| Weight | 0.84 LB |
| EAN or UPC | 697950041643 |
