About Roller Chain and Sprockets
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About Gears
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Idler Sprockets for Metric Roller Chain
Keep constant tension on your drive with these sprockets that press against your metric ISO roller chain to take up slack and reduce wear and vibration. They rotate freely on built-in ball bearings, which are double sealed to keep dirt out, and are for use with roller chain tensioners. All come with a finished bore that fits directly onto your shaft—no need for machining. These sprockets meet ISO 606, which is an international standard for dimensions and materials.
For technical drawings and 3-D models, click on a part number.
Bearing | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Number of Teeth | For Shaft Dia., mm | OD, mm | Overall Wd., mm | Hub Dia., mm | Material | Type | Material | Specifications Met | Each | |
For ISO 05B Roller Chain (8 mm Pitch) | ||||||||||
23 | 16 | 62 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 000000 |
For ISO 06B Roller Chain (9.53 mm Pitch) | ||||||||||
21 | 16 | 68 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
For ISO 08B Roller Chain (12.7 mm Pitch) | ||||||||||
16 | 16 | 69.5 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
18 | 16 | 78 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
For ISO 10B Roller Chain (15.88 mm Pitch) | ||||||||||
15 | 16 | 93 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
17 | 16 | 93 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
For ISO 12B Roller Chain (19.05 mm Pitch) | ||||||||||
15 | 16 | 100 | 18 | 40 | Steel | Ball | Steel | ISO 606 | 0000000 | 00000 |
For ISO 16B Roller Chain (25.4 mm Pitch) | ||||||||||
12 | 20 | 109 | 18 | 47 | Steel | Ball | Steel | ISO 606 | 000000 | 00000 |
High-Power Metal Gears
The helical teeth on these gears stay in contact for longer than straight teeth, which allows them to transmit higher loads at higher speeds than spur gears.
For gears to mesh correctly, they must have the same pressure angle and pitch. All of these gears transmit motion in a straight line—make sure to get one left-hand and one right-hand gear. To change speed and torque in your assembly, pair two gears with different numbers of teeth.
Parallel helical components have a 21 1/2° helix angle so they only transmit motion in a straight line since the helix angle is so small. Made from alloy steel, these gears resist abrasion and are stronger than carbon steel gears. Their teeth are ground, so they're more precise than gears with rolled teeth. Pair them with a rack or a gear that has a different tooth direction.
Gears with hardened teeth have better wear resistance than gears with teeth that are not hardened.
For technical drawings and 3-D models, click on a part number.
Hub | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Module | Number of Teeth | Helix Angle | Gear Pitch Dia., mm | OD, mm | Face Wd., mm | Overall Wd., mm | For Shaft Dia., mm | Teeth Heat Treatment | Dia., mm | Wd., mm | Each | |
Left Hand | ||||||||||||
Round Bore—4140 Alloy Steel | ||||||||||||
1 | 20 | 21 1/2° | 20 | 22 | 8 | 18 | 6 | Hardened | 17 | 10 | 00000000 | 000000 |
1 | 30 | 21 1/2° | 30 | 32 | 8 | 18 | 10 | Hardened | 25 | 10 | 00000000 | 000000 |
1 | 44 | 21 1/2° | 44 | 46 | 8 | 18 | 10 | Hardened | 30 | 10 | 00000000 | 000000 |
Right Hand | ||||||||||||
Round Bore—4140 Alloy Steel | ||||||||||||
1 | 20 | 21 1/2° | 20 | 22 | 8 | 18 | 6 | Hardened | 17 | 10 | 00000000 | 00000 |
1 | 30 | 21 1/2° | 30 | 32 | 8 | 18 | 10 | Hardened | 25 | 10 | 00000000 | 000000 |
1 | 44 | 21 1/2° | 44 | 46 | 8 | 18 | 10 | Hardened | 30 | 10 | 00000000 | 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.
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.
For technical drawings and 3-D models, click on a part number.
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 | |||||||||||||||||
0.8 | 20:1 | 20 | 20° | 16 | 1 | 17.6 | 9 | 18 | 5 | 12 | 9 | Bronze | Right Hand | Not Hardened | Not Ground | 000000000 | 000000 |
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 |
Metal Bevel Gears
A type of miter gear where one gear (sometimes called a pinion) is smaller than the other, bevel gears provide right-angle speed reduction at speed ratios ranging from 2:1 to 5:1. All are carbon steel for strength; they're compatible with plastic bevel gears. Teeth are not hardened so you can harden them to fit your application. Hardening a gear’s teeth increases its wear resistance.
A complete set consists of a gear and pinion (sold separately). For a gear and pinion to mesh correctly, they must have the same pressure angle, pitch/module, and face width. Speed ratio is the ratio by which shaft speed is reduced when transferring motion from pinion to gear. To increase shaft speed, transfer motion from gear to pinion. Changing shaft speed also changes torque: as speed decreases, torque increases.
For technical drawings and 3-D models, click on a part number.
Hub | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Face Wd., mm | Module | Pressure Angle | Speed Ratio | Number of Teeth | Gear Pitch Dia., mm | OD, mm | Overall Wd., mm | For Shaft Dia., mm | Mounting Distance (A), mm | Dia., mm | Wd., mm | Material | Each | |
Round Bore | ||||||||||||||
8 | 1.5 | 20° | 2:1 | 30 | 45 | 46 | 18 | 8 | 25 | 25 | 9 | Black-Oxide 1045 Carbon Steel | 00000000 | 000000 |
Hub | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Face Wd., mm | Module | Pressure Angle | Speed Ratio | Number of Teeth | Gear Pitch Dia., mm | OD, mm | Overall Wd., mm | For Shaft Dia., mm | Mounting Distance (B), mm | Dia., mm | Wd., mm | Material | Each | |
Round Bore | ||||||||||||||
8 | 1.5 | 20° | 2:1 | 15 | 23 | 26 | 17 | 6 | 32 | 16 | 8 | Black-Oxide 1045 Carbon Steel | 00000000 | 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.
Acetal gears are lightweight, and resist corrosion and chemicals. They absorb less moisture than nylon gears, so they’re less prone to dimensional changes. They’re best suited for light duty applications, such as prototyping.
For technical drawings and 3-D models, click on a part number.
Hub | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | |||||||||||||||||
0.8 | 10:1 | 20 | 20° | 16 | 2 | 17.6 | 9 | 18 | 5 | Acetal Plastic | Molded | White | 12 | 9 | Right Hand | 00000000 | 000000 |
0.8 | 50:1 | 50 | 20° | 40 | 1 | 41.6 | 9 | 18 | 8 | Acetal Plastic | Molded | White | 25 | 9 | Right Hand | 00000000 | 00000 |
0.8 | 60:1 | 60 | 20° | 48 | 1 | 49.6 | 9 | 18 | 8 | Acetal Plastic | Molded | White | 25 | 9 | Right Hand | 00000000 | 00000 |