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Metal Gears and Gear Racks—20° Pressure Angle
The current industry standard, these 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears. Compared to plastic gears and racks, they’re better for high-load, high-speed, and heavy duty applications. Also known as spur gears.
Combine gears with different numbers of teeth to change speed and torque in your assembly. Combine a gear and rack to convert rotary motion into linear motion. To minimize your footprint, mount one or more standard gears inside of an internal gear.
For components to mesh correctly, they must have the same pressure angle and pitch/module.
Brass gears and racks are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.
Inch Gears
Gear with Round Bore
Hub | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch  | Number of Teeth | Gear Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Material | Dia. | Wd. | Each | |
Round Bore | |||||||||||
| 64 | 16 | 1/4" | 0.28" | 1/8" | 0.315" | 1/8" | Brass | 0.19" | 0.19" | 0000000 | 000000 |
| 64 | 24 | 3/8" | 0.41" | 1/8" | 0.315" | 1/8" | Brass | 0.28" | 0.19" | 0000000 | 00000 |
| 64 | 28 | 0.438" | 0.47" | 1/8" | 0.315" | 1/8" | Brass | 0.34" | 0.19" | 0000000 | 00000 |
| 48 | 12 | 1/4" | 0.29" | 1/8" | 0.315" | 1/8" | Brass | 0.18" | 0.19" | 0000000 | 00000 |
| 48 | 15 | 0.312" | 0.35" | 1/8" | 0.315" | 1/8" | Brass | 0.22" | 0.19" | 0000000 | 00000 |
| 48 | 18 | 3/8" | 0.42" | 1/8" | 0.315" | 1/8" | Brass | 0.28" | 0.19" | 0000000 | 00000 |
| 48 | 24 | 1/2" | 0.54" | 1/8" | 0.375" | 3/16" | Brass | 0.38" | 0.25" | 0000000 | 00000 |
| 48 | 36 | 3/4" | 0.79" | 1/8" | 0.375" | 3/16" | Brass | 0.5" | 0.25" | 0000000 | 00000 |
| 48 | 48 | 1" | 1.04" | 1/8" | 0.375" | 1/4" | Brass | 0.63" | 0.25" | 0000000 | 00000 |
| 32 | 12 | 3/8" | 0.44" | 3/16" | 0.438" | 1/8" | Brass | 0.28" | 0.25" | 0000000 | 00000 |
| 32 | 14 | 0.438" | 0.5" | 3/16" | 0.438" | 1/8" | Brass | 0.34" | 0.25" | 0000000 | 00000 |
| 32 | 16 | 1/2" | 0.56" | 3/16" | 0.438" | 3/16" | Brass | 0.4" | 0.25" | 0000000 | 00000 |
| 32 | 20 | 5/8" | 0.69" | 3/16" | 0.438" | 3/16" | Brass | 0.47" | 0.25" | 0000000 | 00000 |
| 32 | 24 | 3/4" | 0.81" | 3/16" | 0.438" | 3/16" | Brass | 0.53" | 0.25" | 0000000 | 00000 |
| 32 | 28 | 7/8" | 0.94" | 3/16" | 0.438" | 3/16" | Brass | 0.59" | 0.25" | 0000000 | 00000 |
| 32 | 36 | 1 1/8" | 1.19" | 3/16" | 0.438" | 1/4" | Brass | 0.72" | 0.25" | 0000000 | 00000 |
| 32 | 40 | 1 1/4" | 1.31" | 3/16" | 0.438" | 1/4" | Brass | 0.72" | 0.25" | 0000000 | 00000 |
| 32 | 48 | 1 1/2" | 1.56" | 3/16" | 0.438" | 1/4" | Brass | 0.78" | 0.25" | 0000000 | 00000 |
| 24 | 12 | 1/2" | 0.58" | 1/4" | 0.5" | 3/16" | Brass | 0.38" | 0.25" | 0000000 | 00000 |
| 24 | 15 | 5/8" | 0.71" | 1/4" | 0.5" | 3/16" | Brass | 0.5" | 0.25" | 0000000 | 00000 |
| 24 | 18 | 3/4" | 0.83" | 1/4" | 0.5" | 3/16" | Brass | 0.54" | 0.25" | 0000000 | 00000 |
| 24 | 21 | 7/8" | 0.96" | 1/4" | 0.5" | 3/16" | Brass | 0.6" | 0.25" | 0000000 | 00000 |
| 24 | 36 | 1 1/2" | 1.58" | 1/4" | 0.5" | 1/4" | Brass | 0.79" | 0.25" | 0000000 | 00000 |
| 24 | 48 | 2" | 2.08" | 1/4" | 0.56" | 5/16" | Brass | 0.92" | 0.31" | 0000000 | 00000 |
Metric Gears
Gear with Round Bore
Gear with Round Bore and Set Screw
Gear with Keyed Bore and Set Screw
Hub | Keyway | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Module | Number of Teeth | Gear Pitch Dia., mm | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Material | Dia., mm | Wd., mm | Set Screw Thread Size | Wd., mm | Dp., mm | Each | |
Round Bore | ||||||||||||||
| 0.5 | 20 | 10 | 11 | 3 | 10 | 4 | Brass | 8.5 | 7 | __ | __ | __ | 00000000 | 000000 |
| 0.5 | 25 | 12.5 | 13.5 | 3 | 10 | 4 | Brass | 11 | 7 | __ | __ | __ | 00000000 | 00000 |
| 0.5 | 30 | 15 | 16 | 3 | 10 | 4 | Brass | 13 | 7 | __ | __ | __ | 00000000 | 00000 |
| 0.8 | 20 | 16 | 17.6 | 4 | 12 | 5 | Brass | 13 | 8 | __ | __ | __ | 00000000 | 00000 |
Round Bore with Set Screw | ||||||||||||||
| 0.5 | 15 | 7.5 | 8.5 | 3 | 14 | 3 | Brass | 8.5 | 11 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 16 | 8 | 9 | 3 | 14 | 3 | Brass | 9 | 11 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 17 | 8.5 | 9.5 | 3 | 14 | 3 | Brass | 9.5 | 11 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 20 | 10 | 11 | 3 | 14 | 3 | Brass | 11 | 11 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 21 | 10.5 | 11.5 | 3 | 14 | 3 | Brass | 11.5 | 11 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 22 | 11 | 12 | 3 | 10 | 3 | Brass | 9 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 24 | 12 | 13 | 3 | 10 | 3 | Brass | 10 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 24 | 12 | 13 | 3 | 10 | 4 | Brass | 10 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 25 | 12.5 | 13 | 3 | 10 | 3 | Brass | 10 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 30 | 15 | 16 | 3 | 10 | 3 | Brass | 12 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 30 | 15 | 16 | 3 | 10 | 4 | Brass | 12 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 36 | 18 | 19 | 3 | 10 | 4 | Brass | 16 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 40 | 20 | 21 | 3 | 10 | 4 | Brass | 18 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 50 | 25 | 26 | 3 | 10 | 4 | Brass | 22 | 7 | M3 | __ | __ | 00000000 | 00000 |
| 0.5 | 70 | 35 | 36 | 3 | 10 | 6 | Brass | 28 | 7 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 17 | 13.6 | 15.2 | 4 | 12 | 4 | Brass | 10 | 8 | M3 | __ | __ | 00000000 | 00000 |
| 0.8 | 18 | 14.4 | 16 | 4 | 12 | 4 | Brass | 10 | 8 | M3 | __ | __ | 00000000 | 00000 |
| 0.8 | 21 | 16.8 | 18.4 | 4 | 12 | 5 | Brass | 14 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 23 | 18.4 | 20 | 4 | 12 | 5 | Brass | 15 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 24 | 19.2 | 20.8 | 4 | 12 | 5 | Brass | 16 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 25 | 20 | 21.6 | 4 | 12 | 4 | Brass | 16 | 8 | M3 | __ | __ | 00000000 | 00000 |
| 0.8 | 26 | 20.8 | 22.4 | 4 | 12 | 5 | Brass | 18 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 30 | 24 | 25.6 | 4 | 12 | 4 | Brass | 20 | 8 | M3 | __ | __ | 00000000 | 00000 |
| 0.8 | 30 | 24 | 25.6 | 4 | 12 | 6 | Brass | 20 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 32 | 25.6 | 27.2 | 4 | 12 | 5 | Brass | 22 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 36 | 28.8 | 30.4 | 4 | 12 | 5 | Brass | 25 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 40 | 32 | 33.6 | 4 | 12 | 5 | Brass | 28 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 50 | 40 | 41.6 | 4 | 12 | 6 | Brass | 28 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 0.8 | 60 | 48 | 49.6 | 4 | 12 | 5 | Brass | 28 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 16 | 16 | 18 | 6 | 14 | 5 | Brass | 12 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 17 | 17 | 19 | 6 | 14 | 6 | Brass | 14 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 18 | 18 | 20 | 6 | 14 | 6 | Brass | 15 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 19 | 19 | 21 | 6 | 14 | 6 | Brass | 16 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 20 | 20 | 22 | 6 | 14 | 6 | Brass | 16 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 21 | 21 | 23 | 6 | 14 | 6 | Brass | 18 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 23 | 23 | 25 | 6 | 14 | 6 | Brass | 20 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 24 | 24 | 26 | 6 | 14 | 8 | Brass | 20 | 8 | M5 | __ | __ | 00000000 | 00000 |
| 1 | 30 | 30 | 32 | 6 | 14 | 5 | Brass | 25 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 30 | 30 | 32 | 6 | 14 | 6 | Brass | 25 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 32 | 32 | 34 | 6 | 14 | 5 | Brass | 28 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 32 | 32 | 34 | 6 | 14 | 8 | Brass | 28 | 8 | M5 | __ | __ | 00000000 | 00000 |
| 1 | 36 | 36 | 38 | 6 | 14 | 8 | Brass | 28 | 8 | M5 | __ | __ | 00000000 | 00000 |
| 1 | 40 | 40 | 42 | 6 | 14 | 6 | Brass | 28 | 8 | M4 | __ | __ | 00000000 | 00000 |
| 1 | 40 | 40 | 42 | 6 | 14 | 8 | Brass | 28 | 8 | M5 | __ | __ | 00000000 | 00000 |
| 1 | 50 | 50 | 52 | 6 | 14 | 8 | Brass | 28 | 8 | M5 | __ | __ | 00000000 | 00000 |
Keyed Bore with Set Screw | ||||||||||||||
| 1 | 32 | 32 | 34 | 6 | 14 | 10 | Brass | 28 | 8 | M4 | 4 | 1.8 | 00000000 | 00000 |
| 1 | 40 | 40 | 42 | 6 | 14 | 10 | Brass | 28 | 8 | M4 | 4 | 1.8 | 00000000 | 00000 |
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, pitch/module, number of thread starts, and thread direction. 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.
Bronze gears have low friction and dissipate heat better than cast iron gears to provide a long service life for both the gear and the worm. They’re also more corrosion resistant than cast iron gears.
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—Bronze | |||||||||||||||||
| 12 | 20:1 | 20 | 14 1/2° | 1.67" | 1 | 1.87" | 1/2" | 1" | 1/2" | 1.25" | 0.5" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 0000000 |
| 12 | 30:1 | 30 | 14 1/2° | 2 1/2" | 1 | 2.7" | 1/2" | 1.12" | 1/2" | 1.19" | 0.62" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 12 | 40:1 | 40 | 14 1/2° | 3.33" | 1 | 3.54" | 1/2" | 1.12" | 5/8" | 1.44" | 0.62" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 20:1 | 20 | 14 1/2° | 2" | 1 | 2.24" | 5/8" | 1.245" | 1/2" | 1.25" | 0.62" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 30:1 | 30 | 14 1/2° | 3" | 1 | 3.24" | 5/8" | 1.245" | 5/8" | 1.69" | 0.62" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 40:1 | 40 | 14 1/2° | 4" | 1 | 4.24" | 5/8" | 1.245" | 5/8" | 1.69" | 0.62" | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 10 | 50:1 | 50 | 14 1/2° | 5" | 1 | 5.24" | 5/8" | 1.375" | 3/4" | 1.94" | 0.75" | Bronze | 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—Bronze | |||||||||||||||||
| 0.5 | 15:1 | 30 | 20° | 15 | 2 | 16 | 5 | 12 | 4 | 12 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
| 0.5 | 20:1 | 20 | 20° | 10 | 1 | 11 | 5 | 12 | 4 | 9 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.5 | 30:1 | 30 | 20° | 15 | 1 | 16 | 5 | 12 | 4 | 12 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.5 | 40:1 | 40 | 20° | 20 | 1 | 21 | 5 | 12 | 5 | 15 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.5 | 50:1 | 50 | 20° | 25 | 1 | 26 | 5 | 12 | 5 | 20 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.5 | 60:1 | 60 | 20° | 30 | 1 | 31 | 5 | 12 | 5 | 25 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.5 | 10:1 | 20 | 20° | 10 | 2 | 11 | 5 | 12 | 4 | 9 | 7 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.8 | 20:1 | 20 | 20° | 16 | 1 | 17.6 | 9 | 18 | 5 | 12 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.8 | 30:1 | 30 | 20° | 24 | 1 | 25.6 | 9 | 18 | 5 | 18 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.8 | 40:1 | 40 | 20° | 32 | 1 | 33.6 | 9 | 18 | 6 | 20 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 0.8 | 10:1 | 20 | 20° | 16 | 2 | 17.6 | 9 | 18 | 5 | 12 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1 | 30:1 | 30 | 20° | 30 | 1 | 33 | 10 | 20 | 6 | 20 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1 | 10:1 | 20 | 20° | 20 | 2 | 23 | 10 | 20 | 6 | 16 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.25 | 20:1 | 20 | 20° | 25 | 1 | 28.75 | 10 | 20 | 6 | 20 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 15:1 | 30 | 20° | 45 | 2 | 49.5 | 12 | 22 | 10 | 30 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 20:1 | 20 | 20° | 30 | 1 | 34.5 | 12 | 22 | 8 | 22 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 30:1 | 30 | 20° | 45 | 1 | 49.5 | 12 | 22 | 10 | 30 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
| 1.5 | 10:1 | 20 | 20° | 30 | 2 | 34.5 | 12 | 22 | 8 | 22 | 10 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 00000 |
Round-Belt Idler Pulleys
Brass
These pulleys spin freely on built-in bearings to maintain tension for reduced wear and vibration. They are often used with belt tensioners (sold separately). Ball bearings are double sealed to keep dirt out.
Brass pulleys are nonsparking and fit in extremely small spaces.
| For Belt Dia. | OD | For Shaft Dia. | Dia. | Wd. | Groove Dp. | Material | Bearing Material | Each | |
| 3/32" | 0.8" | 1/8" | 0.654" | 9/64" | 0.048" | Brass | Stainless Steel | 000000 | 000000 |
| 3/32" | 1" | 1/8" | 0.904" | 5/32" | 0.048" | Brass | Stainless Steel | 000000 | 00000 |
| 3/32" | 1.5" | 1/8" | 1.404" | 5/32" | 0.048" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1" | 1/4" | 0.872" | 3/16" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1.5" | 1/4" | 1.372" | 3/16" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 1.5" | 1/4" | 1.372" | 13/64" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 1/8" | 2" | 1/4" | 1.872" | 13/64" | 0.064" | Brass | Stainless Steel | 000000 | 00000 |
| 3/16" | 2" | 3/8" | 1.81" | 9/32" | 0.095" | Brass | Stainless Steel | 000000 | 00000 |
| 3/16" | 2.5" | 3/8" | 2.31" | 9/32" | 0.095" | Brass | Stainless Steel | 0000000 | 00000 |