About Gears
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Metal Miter Gears
With straight, conically shaped teeth and a 1:1 speed ratio, miter gears connect two shafts at an angle without changing shaft speed or torque. They're more efficient than spiral miter gears because they create less friction.
For two gears to mesh correctly, they must have the same pressure angle, shaft angle, pitch/module, and number of teeth.
Carbon steel gears have hard, strong, and wear-resistant teeth. They’re best for heavy duty and high-torque applications, such as lifting equipment. However, these gears will rust when exposed to moisture or corrosive chemicals. Some gears have hardened teeth for additional wear resistance; gears with teeth that are not hardened can be hardened to fit your application.
Stainless steel gears won’t rust in damp or wet environments. They’re commonly used in food-processing plants and other areas where frequent cleaning takes place.
For technical drawings and 3-D models, click on a part number.
Hub | Keyway | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch  | Number of Teeth | For Shaft Angle | Pressure Angle | Gear Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Mounting Distance | Teeth Heat Treatment | Dia. | Wd. | Wd. | Dp. | Set Screw Thread Size | Each | |
Round Bore—1117 Carbon Steel | |||||||||||||||||
| 48 | 18 | 90° | 20° | 3/8" | 0.4" | 0.08" | 0.286" | 1/8" | 0.406" | Not Hardened | 0.31" | 0.16" | __ | __ | __ | 0000000 | 000000 |
| 20 | 12 | 90° | 20° | 0.6" | 0.67" | 0.13" | 0.489" | 1/4" | 0.672" | Not Hardened | 0.5" | 0.31" | __ | __ | __ | 0000000 | 00000 |
| 16 | 12 | 90° | 20° | 3/4" | 0.84" | 0.16" | 0.583" | 5/16" | 0.812" | Not Hardened | 0.62" | 0.38" | __ | __ | __ | 0000000 | 00000 |
Round Bore—1144 Carbon Steel | |||||||||||||||||
| 24 | 24 | 90° | 20° | 1" | 1.06" | 0.2" | 0.563" | 1/4" | 0.906" | Not Hardened | 0.625" | 0.281" | __ | __ | __ | 0000000 | 00000 |
| 20 | 20 | 90° | 20° | 1" | 1.07" | 0.23" | 0.813" | 3/8" | 1.125" | Not Hardened | 0.75" | 0.5" | __ | __ | __ | 0000000 | 00000 |
| 20 | 25 | 90° | 20° | 1 1/4" | 1.32" | 1/4" | 0.75" | 3/8" | 1.188" | Not Hardened | 1" | 0.375" | __ | __ | __ | 0000000 | 00000 |
| 16 | 16 | 90° | 20° | 1" | 1.09" | 0.22" | 0.75" | 3/8" | 1.063" | Not Hardened | 0.75" | 0.438" | __ | __ | __ | 0000000 | 00000 |
| 16 | 20 | 90° | 20° | 1 1/4" | 1.34" | 0.27" | 0.844" | 7/16" | 1.25" | Not Hardened | 1" | 0.5" | __ | __ | __ | 0000000 | 00000 |
| 16 | 24 | 90° | 20° | 1 1/2" | 1.59" | 0.31" | 0.875" | 1/2" | 1.375" | Not Hardened | 1" | 0.5" | __ | __ | __ | 0000000 | 00000 |
| 12 | 15 | 90° | 20° | 1 1/4" | 1.37" | 0.27" | 0.859" | 3/8" | 1.25" | Not Hardened | 1" | 0.5" | __ | __ | __ | 0000000 | 00000 |
| 12 | 15 | 90° | 20° | 1 1/4" | 1.37" | 0.27" | 0.859" | 1/2" | 1.25" | Not Hardened | 1" | 0.5" | __ | __ | __ | 0000000 | 00000 |
| 12 | 18 | 90° | 20° | 1 1/2" | 1.62" | 0.32" | 1.016" | 1/2" | 1.5" | Not Hardened | 1.25" | 0.625" | __ | __ | __ | 0000000 | 00000 |
| 12 | 18 | 90° | 20° | 1 1/2" | 1.62" | 0.32" | 1.016" | 5/8" | 1.5" | Not Hardened | 1.25" | 0.625" | __ | __ | __ | 0000000 | 00000 |
| 12 | 21 | 90° | 20° | 1 3/4" | 1.87" | 0.39" | 1.188" | 1/2" | 1.75" | Not Hardened | 1.375" | 0.688" | __ | __ | __ | 0000000 | 00000 |
| 12 | 21 | 90° | 20° | 1 3/4" | 1.87" | 0.39" | 1.188" | 5/8" | 1.75" | Not Hardened | 1.375" | 0.688" | __ | __ | __ | 0000000 | 00000 |
| 12 | 24 | 90° | 20° | 2" | 2.12" | 0.43" | 1.219" | 1/2" | 1.875" | Not Hardened | 1.5" | 0.688" | __ | __ | __ | 0000000 | 00000 |
| 12 | 30 | 90° | 20° | 2 1/2" | 2.62" | 0.54" | 1.484" | 5/8" | 2.313" | Not Hardened | 1.75" | 0.844" | __ | __ | __ | 0000000 | 00000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 1/2" | 2" | Not Hardened | 1.625" | 0.813" | __ | __ | __ | 0000000 | 00000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 5/8" | 2" | Not Hardened | 1.625" | 0.813" | __ | __ | __ | 0000000 | 00000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 3/4" | 2" | Not Hardened | 1.625" | 0.813" | __ | __ | __ | 0000000 | 00000 |
| 10 | 25 | 90° | 20° | 2 1/2" | 2.64" | 0.55" | 1.625" | 3/4" | 2.438" | Not Hardened | 2" | 0.938" | __ | __ | __ | 0000000 | 000000 |
| 10 | 25 | 90° | 20° | 2 1/2" | 2.64" | 0.55" | 1.625" | 1" | 2.438" | Not Hardened | 2" | 0.938" | __ | __ | __ | 0000000 | 000000 |
Keyed Bore with Set Screw—1144 Carbon Steel | |||||||||||||||||
| 16 | 16 | 90° | 20° | 1" | 1.09" | 0.22" | 0.75" | 3/8" | 1.063" | Hardened | 0.75" | 0.438" | 0.094" | 0.047" | 10-24 | 0000000 | 00000 |
| 16 | 24 | 90° | 20° | 1 1/2" | 1.59" | 0.31" | 0.875" | 1/2" | 1.375" | Hardened | 1" | 0.5" | 0.125" | 0.063" | 10-24 | 0000000 | 00000 |
| 12 | 15 | 90° | 20° | 1 1/4" | 1.37" | 0.27" | 0.859" | 1/2" | 1.25" | Hardened | 1" | 0.5" | 0.125" | 0.063" | 10-24 | 0000000 | 00000 |
| 12 | 18 | 90° | 20° | 1 1/2" | 1.62" | 0.32" | 1.016" | 5/8" | 1.5" | Hardened | 1.25" | 0.625" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 00000 |
| 12 | 21 | 90° | 20° | 1 3/4" | 1.87" | 0.39" | 1.188" | 5/8" | 1.75" | Hardened | 1.375" | 0.688" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 00000 |
| 12 | 30 | 90° | 20° | 2 1/2" | 2.62" | 0.54" | 1.484" | 5/8" | 2.313" | Hardened | 1.75" | 0.844" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 000000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 1/2" | 2" | Hardened | 1.625" | 0.813" | 0.125" | 0.063" | 10-24 | 0000000 | 00000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 5/8" | 2" | Hardened | 1.625" | 0.813" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 00000 |
| 10 | 20 | 90° | 20° | 2" | 2.14" | 0.44" | 1.359" | 3/4" | 2" | Hardened | 1.625" | 0.813" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 00000 |
| 10 | 25 | 90° | 20° | 2 1/2" | 2.64" | 0.55" | 1.625" | 3/4" | 2.438" | Hardened | 2" | 0.938" | 0.188" | 0.094" | 1/4"-20 | 0000000 | 000000 |
| 10 | 25 | 90° | 20° | 2 1/2" | 2.64" | 0.55" | 1.625" | 1" | 2.438" | Hardened | 2" | 0.938" | 0.25" | 0.125" | 5/16"-18 | 0000000 | 000000 |
| 8 | 24 | 90° | 20° | 3" | 3.18" | 0.64" | 1.766" | 1" | 2.75" | Hardened | 2.5" | 1" | 0.25" | 0.125" | 5/16"-18 | 0000000 | 000000 |
| 8 | 28 | 90° | 20° | 3 1/2" | 3.68" | 3/4" | 2.094" | 1" | 3.25" | Hardened | 2.5" | 1.25" | 0.25" | 0.125" | 5/16"-18 | 0000000 | 000000 |
| 6 | 24 | 90° | 20° | 4" | 4.24" | 0.86" | 2.313" | 1 1/2" | 3.625" | Hardened | 3" | 1.313" | 0.375" | 0.188" | 3/8"-16 | 0000000 | 000000 |
Hub | Keyway | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Module | Number of Teeth | For Shaft Angle | Pressure Angle | Gear Pitch Dia., mm | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Mounting Distance, mm | Teeth Heat Treatment | Dia., mm | Wd., mm | Wd., mm | Dp., mm | Set Screw Thread Size | Each | |
Round Bore—1045 Carbon Steel | |||||||||||||||||
| 1.5 | 20 | 45° | 20° | 30 | 32.8 | 11 | 19.3 | 8 | 45 | Not Hardened | 25 | 7.8 | __ | __ | __ | 0000000 | 000000 |
| 1.5 | 20 | 60° | 20° | 30 | 32.6 | 9 | 22.3 | 8 | 40 | Not Hardened | 25 | 12.6 | __ | __ | __ | 0000000 | 00000 |
| 1.5 | 20 | 120° | 20° | 30 | 31.5 | 5 | 20.7 | 8 | 26 | Not Hardened | 26 | 13.9 | __ | __ | __ | 0000000 | 00000 |
| 2.5 | 20 | 45° | 20° | 50 | 54.6 | 18 | 31.9 | 12 | 75 | Not Hardened | 40 | 12.6 | __ | __ | __ | 0000000 | 00000 |
Round Bore with Set Screw—1045 Carbon Steel | |||||||||||||||||
| 1 | 20 | 90° | 20° | 20 | 21.4 | 5 | 14 | 8 | 20 | Hardened | 16 | 8 | __ | __ | M4 | 000000 | 00000 |
| 1 | 20 | 90° | 20° | 20 | 21.4 | 5 | 14 | 10 | 20 | Hardened | 16 | 8 | __ | __ | M4 | 0000000 | 00000 |
| 1.5 | 20 | 90° | 20° | 30 | 32.1 | 8 | 21.1 | 10 | 30 | Hardened | 26 | 13 | __ | __ | M4 | 000000 | 00000 |
Round Bore with Set Screw—303 Stainless Steel | |||||||||||||||||
| 1 | 20 | 90° | 20° | 20 | 21.4 | 5 | 14 | 6 | 20 | Not Hardened | 16 | 8 | __ | __ | M4 | 0000000 | 00000 |
| 1 | 25 | 90° | 20° | 25 | 26.4 | 6 | 15.2 | 6 | 23 | Not Hardened | 20 | 8 | __ | __ | M4 | 0000000 | 00000 |
| 1.5 | 20 | 90° | 20° | 30 | 32.1 | 8 | 21.2 | 8 | 30 | Not Hardened | 26 | 13 | __ | __ | M4 | 0000000 | 00000 |
| 1.5 | 25 | 90° | 20° | 38 | 39.6 | 9 | 22.3 | 10 | 34 | Not Hardened | 30 | 11.5 | __ | __ | M4 | 0000000 | 00000 |
Keyed Bore with Set Screw—1045 Carbon Steel | |||||||||||||||||
| 1 | 30 | 90° | 20° | 30 | 31.4 | 6 | 17.7 | 12 | 28 | Hardened | 26 | 10 | 4 | 1.8 | M5 | 000000 | 00000 |
| 1.5 | 20 | 90° | 20° | 30 | 32.1 | 8 | 21.2 | 12 | 30 | Hardened | 26 | 13 | 4 | 1.8 | M5 | 0000000 | 00000 |
| 1.5 | 30 | 90° | 20° | 45 | 47.1 | 10 | 28.2 | 15 | 43 | Hardened | 36 | 16 | 5 | 2.3 | M5 | 000000 | 00000 |
| 2 | 20 | 90° | 20° | 40 | 42.8 | 10 | 24.9 | 15 | 37 | Hardened | 34 | 14 | 5 | 2.3 | M5 | 000000 | 00000 |
| 2 | 25 | 90° | 20° | 50 | 52.8 | 12 | 24.3 | 15 | 40 | Hardened | 40 | 10 | 5 | 2.3 | M5 | 0000000 | 00000 |
| 2 | 30 | 90° | 20° | 60 | 62.8 | 12 | 29.4 | 15 | 50 | Hardened | 45 | 12.5 | 5 | 2.3 | M5 | 0000000 | 00000 |
| 2 | 30 | 90° | 20° | 60 | 62.8 | 12 | 29.4 | 20 | 50 | Hardened | 45 | 12.5 | 6 | 2.8 | M6 | 000000 | 00000 |
Keyed Bore with Set Screw—303 Stainless Steel | |||||||||||||||||
| 2 | 20 | 90° | 20° | 40 | 42.8 | 10 | 24.9 | 12 | 37 | Not Hardened | 34 | 14 | 4 | 1.8 | M4 | 0000000 | 00000 |
High-Power Metal Miter Gears
Also known as spiral miter gears, these gears have curved teeth that stay in contact longer than straight teeth so they handle heavier loads at higher speeds. They run quieter than standard miter gears because the teeth gradually engage. Use them to transmit motion at a right angle while maintaining shaft speed and torque. Gears are carbon steel for strength. Teeth are hardened for wear resistance.
Gears must be identical in order to mesh correctly; they're sold as a pair.
For technical drawings and 3-D models, click on a part number.
Hub | Keyway | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch | Number of Teeth | Pressure Angle | Gear Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Mounting Distance | Material | Dia. | Wd. | Wd. | Dp. | Set Screw Thread Size | Pair | |
Keyed Bore with Set Screw | ||||||||||||||||
| 18 | 18 | 20° | 1" | 1.07" | 0.22" | 0.74" | 3/8" | 1.062" | 1117 Carbon Steel | 0.75" | 0.44" | 0.094" | 0.047" | 10-32 | 000000 | 0000000 |
| 12 | 15 | 20° | 1 1/4" | 1.36" | 0.3" | 0.86" | 1/2" | 1.25" | 1117 Carbon Steel | 1" | 0.5" | 0.125" | 0.063" | 1/4"-20 | 000000 | 000000 |
| 12 | 18 | 20° | 1 1/2" | 1.61" | 0.34" | 1.02" | 5/8" | 1.5" | 1117 Carbon Steel | 1.25" | 0.56" | 0.188" | 0.094" | 5/16"-18 | 000000 | 000000 |
| 10 | 20 | 20° | 2" | 2.13" | 0.47" | 1.36" | 3/4" | 2" | 1117 Carbon Steel | 1.625" | 0.78" | 0.188" | 0.094" | 5/16"-18 | 000000 | 000000 |
Plastic Miter Gears
Connect two shafts at a right angle without changing shaft speed or torque. Made of plastic, these gears run quieter than metal gears and have good corrosion and chemical resistance.
For two gears to mesh correctly, they must have the same pressure angle, pitch/module, and number of teeth.
Nylon gears are self-lubricating, so they’re often used in food machinery. However, they’re not approved for direct contact with food or chemicals that will come into contact with food.
Acetal gears absorb less moisture than nylon gears and are less prone to dimensional change. They’re best suited for use in light duty applications such as prototyping.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Pitch | Number of Teeth | Pressure Angle | Gear Pitch Dia. | OD | Face Wd. | Overall Wd. | For Shaft Dia. | Mounting Distance | Material | Fabrication | Color | Dia. | Wd. | Each | |
Round Bore | |||||||||||||||
| 48 | 18 | 20° | 3/8" | 0.4" | 0.05" | 0.264" | 1/8" | 0.406" | Nylon Plastic | Molded | White | 0.328" | 0.188" | 0000000 | 000000 |
| 48 | 24 | 20° | 1/2" | 0.53" | 0.09" | 0.375" | 3/16" | 0.531" | Nylon Plastic | Molded | White | 0.375" | 0.25" | 0000000 | 00000 |
| 32 | 16 | 20° | 1/2" | 0.55" | 0.11" | 0.344" | 3/16" | 0.5" | Nylon Plastic | Molded | White | 0.406" | 0.188" | 0000000 | 00000 |
| 32 | 24 | 20° | 3/4" | 0.8" | 0.16" | 0.406" | 3/16" | 0.688" | Nylon Plastic | Molded | White | 0.5" | 0.188" | 0000000 | 00000 |
| 24 | 24 | 20° | 1" | 1.05" | 0.26" | 0.563" | 1/4" | 0.875" | Nylon Plastic | Molded | White | 0.625" | 0.188" | 0000000 | 00000 |
| 24 | 30 | 20° | 1 1/4" | 1.31" | 0.19" | 0.578" | 1/4" | 1.031" | Nylon Plastic | Molded | White | 0.625" | 0.313" | 0000000 | 00000 |
| 24 | 36 | 20° | 1 1/2" | 1.56" | 0.21" | 0.609" | 5/16" | 1.188" | Nylon Plastic | Molded | White | 0.688" | 0.313" | 0000000 | 00000 |
| 16 | 16 | 20° | 1" | 1.09" | 0.22" | 0.75" | 3/8" | 1.063" | Nylon Plastic | Molded | White | 0.75" | 0.438" | 0000000 | 00000 |
Hub | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Module | Number of Teeth | Pressure Angle | Gear Pitch Dia. | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Mounting Distance, mm | Material | Fabrication | Color | Dia., mm | Wd., mm | Each | |
Round Bore | |||||||||||||||
| 0.5 | 20 | 20° | 10mm | 10.7 | 2.5 | 8 | 3 | 11 | Acetal Plastic | Molded | White | 8 | 4 | 000000 | 00000 |
| 0.8 | 20 | 20° | 16mm | 17.1 | 3.5 | 10.8 | 5 | 16 | Acetal Plastic | Molded | White | 12 | 5 | 000000 | 0000 |
| 1 | 20 | 20° | 20mm | 21.4 | 4.5 | 14.6 | 6 | 21 | Acetal Plastic | Molded | White | 16 | 7 | 000000 | 0000 |
| 1 | 20 | 20° | 20mm | 21.4 | 5 | 14 | 6 | 20 | Nylon Plastic | Molded | Blue | 16 | 8 | 00000000 | 00000 |
| 1 | 25 | 20° | 25mm | 26.4 | 6 | 15 | 6 | 23 | Nylon Plastic | Molded | Blue | 20 | 8 | 00000000 | 00000 |
| 1.5 | 20 | 20° | 30mm | 32.1 | 7 | 20.6 | 8 | 30 | Acetal Plastic | Molded | White | 20 | 10 | 000000 | 0000 |
| 2 | 20 | 20° | 40mm | 42.8 | 10 | 25 | 10 | 37 | Nylon Plastic | Molded | Blue | 34 | 14 | 00000000 | 00000 |
Gear Tooth Pitch Identifiers
When replacing a gear, use these gauges to identify pressure angle, pitch, and module.
| For Gear Type | For System of Measurement | For Pitch | For Module | Number of Identifiers | Material | Each | |
For 14 1/2° and 20° Pressure Angles | |||||||
|---|---|---|---|---|---|---|---|
| Spur Gears, Bevel Gears, Helical Gears, Miter Gears | Inch | 3, 4, 5, 6, 8, 10, 12, 16, 20, 24, 32 | __ | 22 | Stainless Steel | 0000000 | 0000000 |
| Spur Gears, Bevel Gears, Helical Gears, Miter Gears | Metric | __ | 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8 | 26 | Stainless Steel | 0000000 | 000000 |