KSS4-21 is a steel spur gear with a module of 4, 21 teeth, and a standard full-depth profile. It has a 20° pressure angle, is made from S45C steel, and has a tooth hardness of less than 194HB. The gear has a bore diameter of 69 mm, an outside diameter of 84 mm, a face width of 20 mm, and a total length of 100 mm. It provides a maximum allowable torque of 27.1 N·cm for strength and 40.3 N·cm for durability. The theoretical backlash is specified as 0.20~0.44 mm. The gear complies with JIS grade N8 precision (JIS B1702-1: 1998).
Module 4, 21 Tooth Mild Steel Spur Gear with Plain Bore
Inch Gears: AGMA 12, 10, 9, and 8
Available Pitches: 120 thru 16
Pressure Angles: 20° and 14.5°
Metric Gears: ISO 5 thru 9
Available Modules: 0.3 thru 3
Pressure Angles: 20° and 14.5°
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Elements of Metric Gear Technology
How to Achieve Optimum Performance in a Miniature Gear Train
You May Also Need:
Shafts
Bearings
Couplings
Our metal spur gears are available in a variety of materials, including:
With a variety of fastening styles, including:
| QTC METRIC GEARS | Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|---|
| Product Category | Gears | Gears |
| Product Number | KSS4-21 | KSS4-21 |
| Product Name | Metal Spur Gears (metric) | Module 4, 21 Tooth Mild Steel Spur Gear with Plain Bore |
| Gear Type | Spur | Spur; Rack |
| Number of Teeth | 21 | 21 |
| Design | Metric | Metric |
| Pressure Angle | 20° | 20° |
| Material | Steel | Steel; Carbon Steel |
