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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.
Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
For technical drawings and 3-D models, click on a part number.
Worms
Keyway | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pitch | Pressure Angle | Lg. | Pitch Dia. | OD | For Shaft Dia. | Wd. | Dp. | Thread Direction | Each | |
Keyed Bore—1144 Carbon Steel | ||||||||||
| 12 | 14 1/2° | 1 1/8" | 1" | 1.17" | 1/2" | 0.125" | 0.063" | Right Hand | 000000000 | 000000 |
| 10 | 14 1/2° | 1 3/8" | 1.25" | 1.45" | 5/8" | 0.188" | 0.094" | Right Hand | 000000000 | 00000 |
| 8 | 14 1/2° | 1 3/4" | 1.5" | 1.75" | 3/4" | 0.188" | 0.094" | Right Hand | 000000000 | 00000 |
| 6 | 14 1/2° | 2 1/2" | 2" | 2.33" | 7/8" | 0.188" | 0.094" | Right Hand | 000000000 | 00000 |
Worm Gears
Hub | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pitch | Speed Ratio | Number of Teeth | Pressure Angle | Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Dia. | Wd. | Each | |
Round Bore—Iron | ||||||||||||
| 12 | 18:1 | 18 | 14 1/2° | 1.5" | 1.69" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | 000000000 | 000000 |
| 12 | 20:1 | 20 | 14 1/2° | 1.67" | 1.85" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | 000000000 | 00000 |
| 12 | 30:1 | 30 | 14 1/2° | 2.5" | 2.69" | 1/2" | 1.125" | 1/2" | 1.25" | 0.625" | 000000000 | 00000 |
| 12 | 40:1 | 40 | 14 1/2° | 3.33" | 3.52" | 1/2" | 1.25" | 5/8" | 1.5" | 0.75" | 000000000 | 00000 |
| 12 | 60:1 | 60 | 14 1/2° | 5" | 5.19" | 1/2" | 1.25" | 5/8" | 1.75" | 0.75" | 000000000 | 000000 |
| 10 | 20:1 | 20 | 14 1/2° | 2" | 2.22" | 5/8" | 1.375" | 1/2" | 1.25" | 0.75" | 000000000 | 00000 |
| 10 | 30:1 | 30 | 14 1/2° | 3" | 3.22" | 5/8" | 1.375" | 5/8" | 1.75" | 0.75" | 000000000 | 00000 |
| 10 | 40:1 | 40 | 14 1/2° | 4" | 4.22" | 5/8" | 1.375" | 5/8" | 1.75" | 0.75" | 000000000 | 000000 |
| 10 | 50:1 | 50 | 14 1/2° | 5" | 5.22" | 5/8" | 1.375" | 3/4" | 2" | 0.75" | 000000000 | 000000 |
| 10 | 100:1 | 100 | 14 1/2° | 10" | 10.22" | 5/8" | 1.375" | 3/4" | 2.5" | 0.75" | 000000000 | 000000 |
| 8 | 20:1 | 20 | 14 1/2° | 2.5" | 2.78" | 3/4" | 1.5" | 3/4" | 1.75" | 0.75" | 000000000 | 00000 |
| 8 | 30:1 | 30 | 14 1/2° | 3.75" | 4.03" | 3/4" | 1.5" | 3/4" | 1.75" | 0.75" | 000000000 | 000000 |
| 8 | 40:1 | 40 | 14 1/2° | 5" | 5.28" | 3/4" | 1.625" | 1" | 2.375" | 0.875" | 000000000 | 000000 |
| 6 | 20:1 | 20 | 14 1/2° | 3.33" | 3.71" | 1" | 1.875" | 3/4" | 1.875" | 0.875" | 000000000 | 000000 |
| 6 | 24:1 | 24 | 14 1/2° | 4" | 4.37" | 1" | 1.875" | 3/4" | 1.875" | 0.875" | 000000000 | 000000 |
| 6 | 30:1 | 30 | 14 1/2° | 5" | 5.37" | 1" | 1.875" | 7/8" | 2.25" | 0.875" | 000000000 | 000000 |
| 6 | 40:1 | 40 | 14 1/2° | 6.67" | 7.04" | 1" | 1.875" | 1" | 2.5" | 0.875" | 000000000 | 000000 |
| 6 | 72:1 | 72 | 14 1/2° | 12" | 12.37" | 1" | 2.25" | 1 1/4" | 3" | 1.25" | 000000000 | 000000 |