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.

For DIN, ISO 05B Roller Chain (8 mm Pitch)
Number of Teeth	For Shaft Dia., mm	For Max. Shaft Dia., mm	OD, mm	Overall Wd., mm	Hub Dia., mm	Material	Specifications Met		Each
9	6	8	26.6	12	15	Steel	DIN 8187, ISO 606	0000000	000000

High-Strength Corrosion-Resistant HTD Timing Belt Pulleys

Move belts forward and backward or stop and start them in precise positions, especially in areas where rust is a concern. The curved teeth on these high-torque drive (HTD) pulleys have more surface contact with belts than traditional trapezoidal teeth, which allows you to apply more torque without damaging belts. These teeth fit together seamlessly to prevent backlash, or unwanted movement of the belt on the pulley, for a smooth, quiet cycle. These pulleys are often used in 3D printing, machine tool drives, robotics, and other applications where precision is essential. They are also known as curvilinear belt pulleys.

Pair pulleys with an HTD timing belt that has the same pitch. The width of your belt should not be larger than the maximum belt width listed.

Aluminum pulleys will not rust in damp or humid environments, but water left on the surface will cause them to corrode.

For technical drawings and 3-D models, click on a part number.

Aluminum—Press-Fit Mount

Press-Fit Mount with Set Screw

For 6 mm Max. Belt Wd.
Manufacturer Series	OD, mm	Number of Teeth	Pitch, mm	For Shaft Dia., mm	Bore Type	Inside Wd., mm	Outside Wd., mm	Overall Wd., mm	Pitch Dia., mm	Number of Flanges	Fabrication	Hub Dia., mm		Each
Gates PowerGrip 2GT	15	20	2	5	Finished	7	8.2	16	12.2	1	Machined	15	0000000	00000
For 9 mm Max. Belt Wd.
Gates PowerGrip 2GT	15	20	2	5	Finished	10	11.2	19	12.2	1	Machined	15	0000000	0000
For 12 mm Max. Belt Wd.
Gates PowerGrip 2GT	15	20	2	5	Finished	13	14.2	22	12.2	1	Machined	15	0000000	0000

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.

Carbon steel components have hard, strong, and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals. They're best for high-torque machines, like lifting equipment, and heavy duty applications, such as rock crushing. Gears with teeth that are not hardened can be hardened to fit your application.

For technical drawings and 3-D models, click on a part number.

Metric Gears

Gear with Round Bore and Set Screw

									Hub
Module	Number of Teeth	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Overall Wd., mm	For Shaft Dia., mm	Material	Teeth Heat Treatment	Dia., mm	Wd., mm	Set Screw Thread Size		Each
Round Bore with Set Screw
0.5	34	17	18	3	10	4	Brass	__	15	7	M3	00000000	000000
0.5	35	17.5	18	5	12	5	Black-Oxide 1045 Carbon Steel	Not Hardened	15	7	M4	00000000	00000
0.5	35	17.5	18.5	3	10	4	Brass	__	15	7	M3	00000000	00000
0.8	23	18.4	20	4	12	5	Brass	__	15	8	M4	00000000	00000
1	18	18	20	6	14	6	Brass	__	15	8	M4	00000000	00000

High-Power Metal Gears

Crossed Right-Hand Gear
and Crossed Left-Hand
Gear (Sold Separately)

Two Crossed Gears with
Right-Hand Teeth
(Sold Separately)

Gear with Round Bore

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.

Crossed helical gears, also known as screw gears, can be configured to transmit motion at a 90° angle. To transmit motion at a 90° angle, pair two gears with the same tooth direction. To avoid wearing down gears, which happens when you use the same material, we recommend mating gears with different materials. Carbon steel gears are stronger than 303 stainless steel gears but are not as corrosion resistant. 303 stainless steel gears have good corrosion resistance, and are commonly used on machinery in food-processing plants.

For technical drawings and 3-D models, click on a part number.

Metric Crossed Gears—20° Pressure Angle

									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—Black-Oxide 1045 Carbon Steel
1	13	45°	18	20.38	10	20	6	Not Hardened	15	10	00000000	000000
Round Bore—303 Stainless Steel
1	13	45°	18	20.38	10	20	6	Not Hardened	15	10	00000000	00000
Right Hand
Round Bore—Black-Oxide 1045 Carbon Steel
1	13	45°	18	20.38	10	20	6	Not Hardened	15	10	00000000	00000
Round Bore—303 Stainless Steel
1	13	45°	18	20.38	10	20	6	Not Hardened	15	10	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 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.

Aluminum-bronze gears have excellent wear resistance.

For technical drawings and 3-D models, click on a part number.

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	40:1	40	20°	20	1	21	5	12	5	15	7	Bronze	Right Hand	Not Hardened	Not Ground	000000000	000000
Round Bore—Aluminum-Bronze
0.5	40:1	40	20°	20	1	21	5	12	5	15	7	Aluminum-Bronze	Right Hand	Not Hardened	Not Ground	000000000	00000

High-Power Plastic Gears

Crossed Right-Hand Gear and Crossed Left-Hand Gear (Sold Separately)

Gear with Left-Hand Teeth

Gear with Right-Hand Teeth

Transmitting loads at higher speeds than spur gears in environments where rusting and exposure to chemicals is a concern, these plastic gears have helical teeth, which stay in contact longer than straight teeth. They’re often called screw or crossed-helical gears. Made of plastic, they’re self-lubricating, so you can use them in food machinery as long as they don’t touch food or food-processing chemicals. Compared to metal gears, they make less noise, but are weaker, more likely to warp, and retain more heat.

For gears to mesh correctly, they must have the same pressure angle, helix angle, and module. Paired together—or even with metal gears—these gears transmit motion in a straight line or at a 90° angle. Use one left-hand and one right-hand gear for straight-line motion, or two gears with the same tooth direction for a 90° angle. To change speed and torque in your assembly, combine two gears with different numbers of teeth.

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	Fabrication	Color	Dia., mm	Wd., mm		Each
Left Hand
Metric Crossed Gears—20° Pressure Angle
Round Bore—Nylon Plastic
1	13	45°	18	20.4	10	20	6	Machined	Blue	15	10	0000000	000000
Right Hand
Metric Crossed Gears—20° Pressure Angle
Round Bore—Nylon Plastic
1	13	45°	18	20.4	10	20	6	Machined	Blue	15	10	0000000	00000

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
0.5	40:1	40	20°	20	1	21	5	12	5	Acetal Plastic	Molded	White	15	7	Right Hand	00000000	000000

18 Products

About Roller Chain and Sprockets

About Gears

Sprockets for Metric Roller Chain

High-Strength Corrosion-Resistant HTD Timing Belt Pulleys

Metal Gears and Gear Racks—20° Pressure Angle

High-Power Metal Gears

Metal Worms and Worm Gears

High-Power Plastic Gears

Plastic Worm Gears