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- 120 Chain Number
- 21 Teeth
- 1 Strand
- Taper Lock 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
- Hardened teeth sprockets afford longer chain and sprocket life
- 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’ Taper bushings
- Stocked Heat Treat
| Material | Steel |
| Chain Pitch | 1 1/2 in |
| Outside Dia. | 10.8520 in |
| Caliper Diameter | 9.1612 in |
| Bushing Series | 3020 |
| No. of Teeth | 21 |
| Hub Dia. | 5 1/4 in |
| Martin No. | 120BTB21H |
| Pitch Diameter | 10.064 in |
| Chain No. | 120 |
| Type | B |
| Inch/Metric | Inch |
| Tooth Width | 0.924 in |
| Overall Length Less Threads | N/A |
| Single Strand Tooth Thickness | 0.924 in |
| Hub Length | 1.08 in |
| Bore Type | Bushed |
| Sprocket Style | B |
| Bushing Bore [Min] | 7/8 in |
| Bushing Bore [Max] | 3 in |
| Hub Projection | 1.08 in |
| Hardened Teeth | With Hardened Teeth |
| Outside Dia. [Min] | 10.8520 in |
| Width Across Teeth | 0.924 in |
| No. of Strands Across | 1 |
| Overall Length | 2 in |
| Bushing Type | Taperlock |
| Length Through Bore | 2 in |
| Weight | 18.4 LB |
| EAN or UPC | 697950043890 |
