McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    28 Products
    About Gears
    industrial info icon

    Compare gear types, measure pitch and module, calculate mounting distance, increase speed or torque, and more.

    Metal Internal Spur Gears

    Image of Product. Front orientation. Internal Spur Gears. Metal Internal Spur Gears.
    Save space without losing power. Insert a standard spur gear inside one of these gears for a compact assembly that smoothly transmits motion. These gears have teeth with a 20° pressure angle, the current industry standard. 20° pressure angle gears have thicker, stronger teeth than 14½° pressure angle gears.
    Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Steel—Steel gears have strong and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.
    Gear
    Module
    No. of
    Teeth
    Gear Pitch
    Dia., mm
    OD,
    mm
    ID,
    mm
    Face Wd.,
    mm
    Tooth Heat
    Treatment
    Material
    Each
    20° Pressure Angle
     
    Steel
    0.5
    		1005070495Not HardenedBlack-Oxide 1045 Carbon Steel2696N15000000
    1
    		1001001309810Not HardenedBlack-Oxide 1045 Carbon Steel2696N26000000
    1.5
    		10015019014715Not HardenedBlack-Oxide 1045 Carbon Steel2696N22000000
    2
    		10020025019620Not HardenedBlack-Oxide 1045 Carbon Steel2696N33000000
     

    Metal Worms and Worm Gears

    Image of System. Worm and Gear Sold Separately. Front orientation. Worm Gears. 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, pitch/module, number of thread starts, and thread direction. These worms are compatible with plastic worm gears.
    Gears
    Image of Product. Front orientation. Worm Gears. Metal Worms and Worm Gears, Gears.
    Image of Attribute. Front orientation. Contains Annotated. Worm Gears. Metal Worms and Worm Gears, Gears.
    Image of Attribute. Front orientation. Contains Annotated. Worm Gears. Metal Worms and Worm Gears, Gears.
    Cast Iron—Cast iron gears are strong and durable.
    Speed Ratio—Speed ratio is the ratio by which output shaft speed is reduced. As speed decreases, torque increases.
    Hub
    Gear
    Module
    Gear
    Pitch
    Speed
    Ratio
    No. of
    Teeth
    Pressure
    Angle
    Gear Pitch
    Dia.
    For No. of
    Thread Starts
    OD
    Face
    Wd.
    Overall
    Wd.
    For Shaft
    Dia.
    Dia.
    Wd.
    Material
    For Thread
    Direction
    Tooth Heat
    Treatment
    Tooth Mechanical
    Finish
    Each
    Round Bore—Cast Iron
    —10
    		100:110014 1/2°10"110.22"5/8"1.375"3/4"2.5"0.75"Cast IronRight Hand
    		Not HardenedUnfinished57545K4240000000
    1
    		—100:110020°100 mm1103 mm10 mm20 mm10 mm40 mm10 mmCast IronRight Hand
    		Not HardenedUnfinished57545K78500000
     

    Metal Spur Gears

    Our strongest spur gears for transferring motion. They’re better than plastic gears for high-load, high-speed, and heavy duty applications. 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.
    Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Gears
    Image of Product. Front orientation. Spur Gears. Metal Spur Gears, 20° Pressure Angle, Round Bore.
    Image of Product. Gear with Round Bore and Set Screw. Back orientation. Spur Gears. Metal Spur Gears, 20° Pressure Angle, Round Bore with Set Screw.
    Image of Product. Front orientation. Spur Gears. Metal Spur Gears, 20° Pressure Angle, Clamping Bore with Clamping Screw.

    20° Pressure Angle

    Round Bore

    Gear with Round

    Bore and Set Screw

    20° Pressure

    Angle, Clamping

    Bore with

    Clamping Screw

    20° Pressure Angle—The current industry standard, these 20° pressure angle spur gears have thicker, stronger teeth than 14½° pressure angle gears.
    Steel—Steel gears have hard, strong, and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.
    Stainless Steel—Stainless steel gears resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning.
    Clamping Bore—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.
    Hub,
    mm
    Gear
    Module
    No. of
    Teeth
    Gear Pitch
    Dia., mm
    OD,
    mm
    Face Wd.,
    mm
    Dia.
    Wd.
    Bore Type
    For Shaft
    Dia., mm
    Tooth Heat
    Treatment
    Material
    Each
    20° Pressure Angle
     
    Steel
    0.5
    		10050515287Round Bore with Set Screw8Not HardenedBlack-Oxide 1045 Carbon Steel2664N333000000
     
    Stainless Steel
    1
    		10010010262414Clamping Bore with Clamping Screw10Not Hardened303 Stainless Steel3757N34000000
    1.5
    		100150153158014Round Bore
    		15Not Hardened303 Stainless Steel2664N505000000
     
    Gear Racks
    Image of Product. Front orientation. Spur Gear Racks. Metal Spur Gears, 20° Pressure Angle—Rectangular.

    20° Pressure Angle—Rectangular

    These racks match with spur gears to convert rotary motion to linear motion. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Steel—Steel gear racks have strong and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.
    Stainless Steel—Stainless steel gear racks resist rust in damp and wet environments, so they're commonly used in food-processing plants and other areas with frequent cleaning.
    Hardened—Gear racks with hardened teeth have better wear resistance than racks with teeth that are not hardened.
    Gear
    Module
    Lg.,
    mm
    Pitch Ht.,
    mm
    Ht.,
    mm
    Face Wd.,
    mm
    Tooth Heat
    Treatment
    Material
    Features
    Each
    20° Pressure Angle—Rectangular
     
    Steel
    0.5
    		10011.5125Not HardenedBlack-Oxide 1045 Carbon Steel—2485N242000000
    0.5
    		30011.5125Not HardenedBlack-Oxide 1045 Carbon SteelMachined Ends2485N24100000
     
    Stainless Steel
    1
    		500111210Hardened304 Stainless Steel—2485N232000000
    1.5
    		50018.52015Hardened304 Stainless Steel—2485N231000000
    1.5
    		1,00018.52015Hardened304 Stainless SteelMachined Ends2485N229000000
     
    Internal Gears
    Image of Product. Front orientation. Internal Spur Gears. Metal Spur Gears.
    Save space without losing power. Insert a standard spur gear inside one of these gears for a compact assembly that smoothly transmits motion. Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Steel—Steel gears have strong and wear-resistant teeth, although they will rust when exposed to moisture and corrosive chemicals.
    Gear
    Module
    No. of
    Teeth
    Gear Pitch
    Dia., mm
    OD,
    mm
    ID,
    mm
    Face Wd.,
    mm
    Tooth Heat
    Treatment
    Finished Material
    Each
    20° Pressure Angle
     
    Steel
    0.5
    		603050295Not HardenedBlack-Oxide 1045 Carbon Steel2696N16000000
    0.5
    		1005070495Not HardenedBlack-Oxide 1045 Carbon Steel2696N1500000
     

    Metal Ratchet Gears and Pawls

    Image of System. Gears and Pawls (Sold Separately). Front orientation. Ratchet Gears and Pawls. Metal Ratchet Gears and Pawls.

    Gears and

    Pawls (Sold

    Separately)

    Gears
    Image of Attribute. Front orientation. Contains Annotated.
    Image of Attribute. Front orientation. Contains Annotated.
    Compared to nylon gears, these metal ratchet 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.
    Hardened—Gears with hardened teeth are more wear resistant than gears with teeth that are not hardened.
    Hub,
    mm
    Face Wd.,
    mm
    No. of
    Teeth
    OD,
    mm
    For Shaft
    Dia., mm
    Mounting Distance,
    mm
    Material
    Tooth Heat
    Treatment
    Overall
    Wd., mm
    Dia.
    Wd.
    Each
    Round Bore
    610066.61244.11045 Carbon Steel
    		Hardened6——6283K73000000
    610066.61244.11045 Carbon Steel
    		Hardened1640106283K6400000
    121001001562.21045 Carbon Steel
    		Hardened12——6283K6500000
    121001001562.21045 Carbon Steel
    		Hardened2450126283K9300000
     

    Precision High-Torque GT Timing Belt Pulleys

    Image of Product. Front orientation. Timing Belt Drive Pulleys. Precision High-Torque GT Timing Belt Pulleys, Finished Bore.

    Finished Bore

    Image of Attribute. Front orientation. Contains Annotated, Border. Modified Curved (GT) Teeth.
    When precise synchronization is crucial, these pulleys minimize play (backlash). They’re often found in 3D printers, where accurate positioning is essential. Their curved teeth fit snugly with matching belts. Compared to pulleys with standard trapezoidal teeth, these pulleys transmit about three times more torque and run at higher speeds. All are compatible with Gates PowerGrip GT, 2GT, GT2, GT3, and GT4 series.
    Corrosion-Resistant Aluminum—Won't rust in wet environments and one-third the weight of steel and iron. However, aluminum pulleys are not as strong as iron and steel.
    Finished Bore—Mount these pulleys onto the shaft and secure with a set screw—no machining required.
    For Max.
    Belt Wd., mm
    Pitch,
    mm
    No. of
    Teeth
    Bore
    Type
    For Shaft
    Dia.
    Pitch Dia.,
    mm
    Hub
    Type
    Each
    For 2MGT Trade Size
     
    Corrosion-Resistant Aluminum
    62100Finished
    		5/16"63.7Standard3764N122000000
     
    For 3MGT Trade Size
     
    Corrosion-Resistant Aluminum
    93100Finished
    		5/16"95.5Standard3764N1500000
     

    Timing Belt Pulleys

    Image of Product. Front orientation. Timing Belt Drive Pulleys. Timing Belt Pulleys, Finished Bore.
    Image of Attribute. Front orientation. Contains Annotated, Border. Timing Belt Pulleys.

    Finished Bore

    Keep your drive system in sync. Trapezoidal teeth mesh with matching belts to synchronize motion. With the original tooth profile, these pulleys handle enough torque for most applications. If you need high torque or precise starts and stops, consider curved tooth profiles, such as GT and HTD pulleys.
    Corrosion-Resistant Aluminum—Won't rust in wet environments and one-third the weight of steel and iron. However, aluminum pulleys are not as strong as iron and steel.
    Finished Bore—Mount these pulleys onto the shaft and secure with a set screw—no machining required.
    For Max.
    Belt Wd., mm
    Pitch
    No. of
    Teeth
    Bore
    Type
    For Shaft
    Dia., mm
    Pitch Dia.,
    mm
    Hub
    Type
    Each
    For MXL Trade Size
     
    Corrosion-Resistant Aluminum
    60.080"100Finished
    		864.7Standard1375K166000000
    90.080"100Finished
    		864.7Standard1375K16700000
     

    Plastic Spur Gears

    Made of plastic, these spur gears run more quietly than metal gears and have good corrosion and chemical resistance. However, they’re not as strong as metal gears, so they’re best for light duty applications. Combine a gear and rack to convert rotary motion into linear motion.
    Combine gears with different numbers of teeth to change speed and torque in your assembly. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Gears
    Image of Product. Front orientation. Spur Gears. Plastic Spur Gears, 20° Pressure Angle.

    20° Pressure

    Angle

    20° Pressure Angle—The current industry standard, these 20° pressure angle spur gears have thicker, stronger teeth than 14½° pressure angle gears.
    Nylon—Nylon gears are wear resistant, but will swell and weaken over time when wet.
    Hub,
    mm
    Gear
    Module
    No. of
    Teeth
    Gear Pitch
    Dia., mm
    OD,
    mm
    Face Wd.,
    mm
    Dia.
    Wd.
    Bore Type
    For Shaft
    Dia., mm
    Color
    Each
    20° Pressure Angle
     
    Nylon
    1
    		100100102104010Round Bore
    		10Blue2662N414000000
    1.5
    		100150153156010Round Bore
    		12Blue2662N384000000
     
    Gear Racks
    Image of Product. Front orientation. Spur Gear Racks. Plastic Spur Gears, 20° Pressure Angle—Rectangular.

    20° Pressure Angle—Rectangular

    These racks match with spur gears to convert rotary motion to linear motion. For components to mesh correctly, they must have the same pressure angle and pitch/module.
    Acetal—Acetal gear racks absorb less water than nylon racks, so they’re less likely to swell.
    Nylon—Nylon gear racks are wear resistant, but will swell and weaken over time when wet.
    Machined—Machined gear racks may be slightly bowed but will straighten out when installed.
    Gear
    Module
    Lg.,
    mm
    Pitch Ht.,
    mm
    Ht.,
    mm
    Face Wd.,
    mm
    Fabrication
    Color
    Each
    20° Pressure Angle—Rectangular
     
    Acetal
    1.5
    		50018.52015MachinedWhite2662N620000000
     
    Nylon
    1
    		500111210MachinedBlue2662N67000000
     

    Plastic Timing Belt Pulleys

    Image of Product. Front orientation. Timing Belt Drive Pulleys. Plastic Timing Belt Pulleys.
    Image of Attribute. Front orientation. Contains Annotated, Border. Trapezoidal Teeth.
    Naturally rust resistant and lightweight, these plastic pulleys are ideal for machines that require frequent washdowns. Trapezoidal teeth, the original tooth profile, mesh with matching belts to transmit power without slipping.
    Plain Bore—Do it your way—machine the bore to your exact shaft size or add a set screw or keyway.
    For Max.
    Belt Wd., mm
    Pitch
    No. of
    Teeth
    Bore
    Type
    For Shaft
    Dia., mm
    Pitch Dia.,
    mm
    No. of
    Flanges
    Hub
    Type
    Each
    For MXL Trade Size
     
    Polycarbonate
    60.080"100Plain
    		864.71Standard7717N93000000
     
    back to top