Clear All
Component Component |
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 | Gear |
OD OD |
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Gear Type Gear Type |
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 | Worm |
Gear Pitch Diameter Gear Pitch Diameter |
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Bore Type Bore Type |
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 | Round |
Hub Material Hub Material |
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Teeth Heat Treatment Teeth Heat Treatment |
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Teeth Fabrication Teeth Fabrication |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Gears
More
Metal Worms and Worm Gears
Worm and Gear Sold Separately
Worm gears use screw threads to make large reductions to shaft speed while transmitting motion at a right angle. They transmit motion from worm to gear and cannot be reversed. For gears and worms to mesh correctly, they must have the same pressure angle and pitch/module. These worms are compatible with plastic worm gears.
Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
Cast iron gears are strong and durable.
For technical drawings and 3-D models, click on a part number.
Inch Worm Gears
Gear
Hub | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch | Speed Ratio | Number of Teeth | Pressure Angle | Gear Pitch Dia. | For Number of Thread Starts | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Dia. | Wd. | Material | For Thread Direction | Teeth Heat Treatment | Teeth Fabrication | Each | |
Round Bore—Cast Iron | |||||||||||||||||
| 12 | 18:1 | 18 | 14 1/2° | 1 1/2" | 1 | 1.69" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 12 | 20:1 | 20 | 14 1/2° | 1.67" | 1 | 1.85" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 12 | 30:1 | 30 | 14 1/2° | 2 1/2" | 1 | 2.69" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 12 | 40:1 | 40 | 14 1/2° | 3.33" | 1 | 3.52" | 1/2" | 1.25" | 5/8" | 1.5" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 12 | 60:1 | 60 | 14 1/2° | 5" | 1 | 5.19" | 1/2" | 1.25" | 5/8" | 1.75" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 20:1 | 20 | 14 1/2° | 2" | 1 | 2.22" | 5/8" | 1.375" | 1/2" | 1.25" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 10 | 30:1 | 30 | 14 1/2° | 3" | 1 | 3.22" | 5/8" | 1.375" | 5/8" | 1.75" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 40:1 | 40 | 14 1/2° | 4" | 1 | 4.22" | 5/8" | 1.375" | 5/8" | 1.75" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 50:1 | 50 | 14 1/2° | 5" | 1 | 5.22" | 5/8" | 1.375" | 3/4" | 2" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 100:1 | 100 | 14 1/2° | 10" | 1 | 10.22" | 5/8" | 1.375" | 3/4" | 2.5" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 8 | 20:1 | 20 | 14 1/2° | 2 1/2" | 1 | 2.78" | 3/4" | 1.5" | 3/4" | 1.75" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 8 | 30:1 | 30 | 14 1/2° | 3 3/4" | 1 | 4.03" | 3/4" | 1.5" | 3/4" | 1.75" | 0.75" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 8 | 40:1 | 40 | 14 1/2° | 5" | 1 | 5.28" | 3/4" | 1.625" | 1" | 2.375" | 0.875" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 6 | 20:1 | 20 | 14 1/2° | 3.33" | 1 | 3.71" | 1" | 1.875" | 3/4" | 1.875" | 0.875" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 6 | 24:1 | 24 | 14 1/2° | 4" | 1 | 4.37" | 1" | 1.875" | 3/4" | 1.875" | 0.875" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 6 | 30:1 | 30 | 14 1/2° | 5" | 1 | 5.37" | 1" | 1.875" | 7/8" | 2.25" | 0.875" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 6 | 40:1 | 40 | 14 1/2° | 6.67" | 1 | 7.04" | 1" | 1.875" | 1" | 2.5" | 0.875" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 6 | 72:1 | 72 | 14 1/2° | 12" | 1 | 12.37" | 1" | 2.25" | 1 1/4" | 3" | 1.25" | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
Metric Worm Gears
Gear
Hub | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Module | Speed Ratio | Number of Teeth | Pressure Angle | Gear Pitch Dia., mm | For Number of Thread Starts | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Dia., mm | Wd., mm | Material | For Thread Direction | Teeth Heat Treatment | Teeth Fabrication | Each | |
Round Bore—Cast Iron | |||||||||||||||||
| 1 | 120:1 | 120 | 20° | 120 | 1 | 123 | 10 | 20 | 10 | 40 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 1 | 60:1 | 60 | 20° | 60 | 1 | 63 | 10 | 20 | 10 | 30 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1 | 100:1 | 100 | 20° | 100 | 1 | 103 | 10 | 20 | 10 | 40 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1 | 80:1 | 80 | 20° | 80 | 1 | 83 | 10 | 20 | 10 | 35 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 30:1 | 30 | 20° | 45 | 1 | 49.5 | 12 | 22 | 10 | 30 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 40:1 | 40 | 20° | 60 | 1 | 64.5 | 12 | 22 | 12 | 30 | 10 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 2 | 20:1 | 20 | 14 1/2° | 40 | 1 | 46 | 22 | 35 | 12 | 33 | 13 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 2 | 10:1 | 20 | 14 1/2° | 40 | 2 | 46 | 22 | 35 | 12 | 33 | 13 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 2.5 | 10:1 | 20 | 20° | 50 | 2 | 57.5 | 22 | 36 | 12 | 35 | 14 | Cast Iron | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |