100 Teeth Sprockets | McMaster-Carr

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	Component Component


Gear	Internal Gear

	System of Measurement System of Measurement

Inch

Metric

	Number of Teeth Number of Teeth	Show

100

	Number of Teeth Number of Teeth	Hide

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	OD OD

	Module Module

0.5

0.8

1.5

	Gear Pitch Diameter Gear Pitch Diameter

	For Shaft Diameter For Shaft Diameter

	Gear Type Gear Type


Spur	Worm

Ratchet	Helical

	Material Material

	Bore Type Bore Type


Finished	Round

Clamping

	Face Width Face Width

	Pressure Angle Pressure Angle

14 1/2°

20°

	Speed Ratio Speed Ratio

100:1

	Overall Width Overall Width

	Teeth Heat Treatment Teeth Heat Treatment

Hardened

Not Hardened

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Pitch Pitch

2 mm

2.030mm

3 mm

	For Maximum Belt Width For Maximum Belt Width

6 mm

9 mm

	Gear Pitch Gear Pitch

	Hub Diameter Hub Diameter

	For Belt Trade Size For Belt Trade Size

GT2

GT3

MXL

	ID ID

	Hub Width Hub Width

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30 Products

About Gears

MXL Series Corrosion-Resistant Timing Belt Pulleys

Anodized aluminum has good corrosion resistance. Pulleys are MXL series (miniature extra light) and have trapezoidal teeth. The teeth match up with the grooves along the inside diameter of a timing belt in order to move components forward or backward. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.

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

Press-Fit Mount with Set Screw

Without Flanges

For 6 mm Max. Belt Wd.
OD	Number of Teeth	Pitch	For Shaft Dia.	Bore Type	Outside Wd.	Overall Wd.	Pitch Dia.	Fabrication	Material	Hub Dia.		Each
64.2mm	100	2.030mm	8mm	Finished	9.5mm	19.1mm	64.7mm	Machined	Anodized Aluminum	38.1mm	00000000	000000
For 9 mm Max. Belt Wd.
64.2mm	100	2.030mm	8mm	Finished	12.7mm	22.2mm	64.7mm	Machined	Anodized Aluminum	38.1mm	00000000	00000

MXL Series Lightweight Timing Belt Pulleys

Made from polycarbonate, these pulleys are useful in applications with weight constraints. All are MXL series (miniature extra light) and have trapezoidal teeth. The teeth match up with the grooves along the inside diameter of a timing belt in order to move components forward or backward. Select a pulley with a maximum belt width that’s the same or larger than your timing belt width.

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

Press-Fit Mount

With Hub and One Flange (18 Teeth or More)

With Hub and One Flange (18 Teeth or More)

												1 Flange
OD	Number of Teeth	Pitch	For Shaft Dia.	Bore Type	Inside Wd.	Outside Wd.	Overall Wd.	Pitch Dia.	Fabrication	Material	Hub Dia.		Each
For 6 mm Max. Belt Wd.
69mm	100	2.030mm	8mm	Finished	8mm	11.2mm	17.5mm	64.7mm	Molded	Polycarbonate	17.5mm	0000000	000000

High-Strength GT Timing Belt Pulleys

For higher speed or higher torque applications, these GT series timing belt pulleys provide a more precise fit than HTD pulleys. Use them where accuracy is critical, such as in storage and retrieval systems or in robotics. Similar to HTD timing belt pulleys, their teeth are curved for high strength. The curved teeth create positive grip engagement with timing belts, so these pulleys do not require re-tensioning—unlike drives using V-belts or sheaves. And unlike chain drives, there’s no metal-on-metal contact, so these pulleys don’t require lubrication.

Anodized aluminum pulleys are lightweight and resist corrosion. They have a finished bore and come with set screws for mounting on shafts.

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

Press-Fit Mount

With Hub

For 6 mm Maximum Belt Width
Number of Teeth	Pitch, mm	For Shaft Diameter	Bore Type	Outside Width, mm	Overall Width, mm	Pitch Diameter, mm	Fabrication	Material	Hub Diameter, mm		Each
100	2	5/16"	Finished	9.65	19.05	63.652	Machined	Anodized Aluminum	38.1	00000000	000000
For 9 mm Maximum Belt Width
100	3	5/16"	Finished	12.7	22.26	95.504	Machined	Anodized Aluminum	31.75	0000000	00000

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.

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.

Stainless steel gears and racks resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning. Gears with a clamping bore have a built-in clamp that securely grips shafts without marring them. Use the included clamping screw to tighten or loosen the grip.

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

Metric Gears

Gear with Round Bore

Gear with Round Bore and Set Screw

Gear with Clamping Bore and Clamping 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	Clamping Screw Thread Size		Each
Round Bore
1	100	100	102	10	20	10	Black-Oxide 1045 Carbon Steel	Not Hardened	40	10	__	__	00000000	000000
1	100	100	102	10	20	12	303 Stainless Steel	Not Hardened	60	10	__	__	00000000	000000
1.5	100	150	153	15	29	15	303 Stainless Steel	Not Hardened	80	14	__	__	00000000	000000
Round Bore with Set Screw
0.5	100	50	51	5	12	8	Black-Oxide 1045 Carbon Steel	Not Hardened	28	7	M5	__	00000000	00000
Clamping Bore with Clamping Screw
0.5	100	50	51	5	19	10	303 Stainless Steel	Not Hardened	24	14	__	M4	0000000	000000
1	100	100	102	6	20	10	303 Stainless Steel	Not Hardened	24	14	__	M4	0000000	000000

Metric Internal Gears

Module	Number of Teeth	Gear Pitch Dia., mm	OD, mm	ID, mm	Face Wd.	Material	Teeth Heat Treatment		Each
0.5	100	50	70	49	5mm	Black-Oxide 1045 Carbon Steel	Not Hardened	0000000	000000
0.8	100	80	105	78.4	8mm	Black-Oxide 1045 Carbon Steel	Not Hardened	0000000	000000
1	100	100	130	98	10mm	Black-Oxide 1045 Carbon Steel	Not Hardened	0000000	000000
1.5	100	150	190	147	15mm	Black-Oxide 1045 Carbon Steel	Not Hardened	0000000	000000
2	100	200	250	196	20mm	Black-Oxide 1045 Carbon Steel	Not Hardened	0000000	000000

High-Power Metal Gears

Standard Gear on Gear Rack (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.

Standard 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.

Metric Standard 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—4140 Alloy Steel
1	100	21 1/2°	100	102	8	18	15	Hardened	50	10	00000000	0000000
1.5	100	21 1/2°	150	153	12	24	20	Hardened	70	12	00000000	000000
Right Hand
Round Bore—4140 Alloy Steel
1	100	21 1/2°	100	102	8	18	15	Hardened	50	10	00000000	000000
1.5	100	21 1/2°	150	153	12	24	20	Hardened	70	12	00000000	000000

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.

Cast iron gears are strong and durable.

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

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—Cast Iron
10	100:1	100	14 1/2°	10"	1	10.22"	5/8"	1.375"	3/4"	2.5"	0.75"	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	0000000

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—Cast Iron
1	100:1	100	20°	100	1	103	10	20	10	40	10	Cast Iron	Right Hand	Not Hardened	Not Ground	000000000	000000

Plastic 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. Made of plastic, they run quieter than metal gears and have good corrosion and chemical resistance. They’re 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.

For components to mesh correctly, they must have the same pressure angle and pitch/module.

Acetal gears are best suited for use in light duty machines or for prototyping. Gears with a clamping bore secure to shafts with a clamping screw. They’re easily removed or adjusted without marring your shaft.

Nylon gears can be operated without lubrication, so they’re commonly used in food-processing machines.

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

Metric Gears

Round Bore

Clamping Bore

										Hub
Module	Number of Teeth	Gear Pitch Dia., mm	OD, mm	Face Wd., mm	Overall Wd., mm	For Shaft Dia., mm	Material	Fabrication	Color	Dia., mm	Wd., mm	Clamping Screw Thread Size		Each
Round Bore
1	100	100	102	10	20	10	Nylon Plastic	Machined	Blue	40	10	__	00000000	000000
1.5	100	150	153	15	25	12	Nylon Plastic	Machined	Blue	60	10	__	00000000	000000
Clamping Bore
0.5	100	50	51	5	15	8	Acetal Plastic	Molded	White	19	10	M3	00000000	00000
1	100	100	102	6	16	8	Acetal Plastic	Molded	White	19	10	M3	00000000	000000

Metal Ratcheting Gears

Pawl and Gear Sold Separately

Compared to plastic gears, these metal ratcheting gears are better for high-load, high-speed, and heavy duty applications. Used to prevent unwanted motion in jacks, tie downs, clutches, and winches, ratchet gears have sloped teeth that allow motion in one direction and prevent it in the other.

Gears with hardened teeth are more wear resistant than gears with teeth that are not hardened.

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

Gears

								Hub
Face Wd.	Number of Teeth	OD	For Shaft Dia.	Mounting Distance	Material	Teeth Heat Treatment	Overall Wd.	Dia.	Wd.		Each
Round Bore
6mm	100	66.6mm	12mm	44.1mm	1045 Carbon Steel	Hardened	6 mm	__	__	0000000	000000
6mm	100	66.6mm	12mm	44.1mm	1045 Carbon Steel	Hardened	16 mm	40 mm	10 mm	0000000	00000
12mm	100	100mm	15mm	62.2mm	1045 Carbon Steel	Hardened	12 mm	__	__	0000000	00000
12mm	100	100mm	15mm	62.2mm	1045 Carbon Steel	Hardened	24 mm	50 mm	12 mm	0000000	00000