Component Component |
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![]() | Gear |
System of Measurement System of Measurement |
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Material Material |
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OD OD | Show |
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OD OD | Hide |
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Gear Type Gear Type |
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![]() | Worm |
Module Module |
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Pressure Angle Pressure Angle |
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Roller Chain Trade Size Roller Chain Trade Size |
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For Thread Direction For Thread Direction |
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For Maximum Shaft Diameter For Maximum Shaft Diameter |
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Bore Type Bore Type |
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Machinable | Round |
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Sprocket Type Sprocket Type |
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About Roller Chain and Sprockets
More
About Gears
More
Sprockets for Metric Roller Chain


Designed to meet ISO 606 and DIN 8187 international dimensional standards, these sprockets are for use with compatible ISO and DIN roller chain. They come machined to the shaft diameter size listed and are machinable up to the maximum shaft diameter size.
For technical drawings and 3-D models, click on a part number.
Number of Teeth | For Shaft Dia., mm | For Max. Shaft Dia., mm | OD, mm | Overall Wd., mm | Hub Dia., mm | Material | Specifications Met | Each | |
For DIN, ISO 05B Roller Chain (8 mm Pitch) | |||||||||
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21 | 8 | 25 | 57.5 | 14 | 35 | Steel | DIN 8187, ISO 606 | 0000000 | 000000 |
Metal Worms and Worm Gears

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.
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.
Aluminum-bronze gears have excellent wear resistance.
For technical drawings and 3-D models, click on a part number.



Hub | |||||||||||||||||
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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 | |||||||||||||||||
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 22 | 36 | 12 | 35 | 14 | Cast Iron | Left Hand | Not Hardened | Not Ground | 000000000 | 000000 |
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 22 | 36 | 12 | 35 | 14 | 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 | Left 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 |
Round Bore—Bronze | |||||||||||||||||
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 22 | 36 | 12 | 35 | 14 | Bronze | Left Hand | Not Hardened | Not Ground | 000000000 | 000000 |
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 22 | 36 | 12 | 35 | 14 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
2.5 | 10:1 | 20 | 20° | 50 | 2 | 57.5 | 22 | 36 | 12 | 35 | 14 | Bronze | Left Hand | Not Hardened | Not Ground | 000000000 | 000000 |
2.5 | 10:1 | 20 | 20° | 50 | 2 | 57.5 | 22 | 36 | 12 | 35 | 14 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
Round Bore—Aluminum-Bronze | |||||||||||||||||
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 20 | 34 | 12 | 35 | 14 | Aluminum-Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
2.5 | 10:1 | 20 | 20° | 50 | 2 | 57.5 | 20 | 34 | 12 | 35 | 14 | Aluminum-Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
Plastic Worm Gears



These plastic gears are lighter and quieter than metal gears—pair them with metal worms for lubrication-free operation. 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 module.
Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
Nylon gears are lightweight and stronger than acetal gears.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||||||
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Module | Speed Ratio | Number of Teeth | Pressure Angle | Gear Pitch Dia., mm | For Number of Thread Starts | OD, mm | Face Width, mm | Overall Width, mm | For Shaft Diameter, mm | Material | Fabrication | Color | Diameter, mm | Width, mm | For Thread Direction | Each | |
Round Bore | |||||||||||||||||
2.5 | 10:1 | 20 | 20° | 50 | 2 | 57.5 | 22 | 36 | 12 | Nylon Plastic | Molded | Blue | 35 | 14 | Right Hand | 00000000 | 000000 |
2.5 | 20:1 | 20 | 20° | 50 | 1 | 57.5 | 22 | 36 | 12 | Nylon Plastic | Molded | Blue | 35 | 14 | Right Hand | 00000000 | 00000 |