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)
    90 Products

    Sprockets

    Image of Product. Finished Bore. Front orientation. Drive Sprockets. Sprockets, For Single Strand, Finished Bore.

    Finished Bore

    Sprocket teeth mesh with your roller chain to smoothly transmit power. These U.S.-made sprockets have machined teeth for a more precise fit than flame-cut or punched teeth, allowing them to glide in and out of the chain to reduce wear and extend chain life.
    Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.
    Finished Bore—Mount these sprockets onto your shaft and secure with a set screw—no machining required.
    For
    Roller Chain
    Keyway
    Trade
    No.
    Std.
    Pitch
    No. of
    Teeth
    OD
    Bore
    Type
    For Shaft
    Dia.
    Wd.
    Dp.
    Each
    For Single Strand
     
    Steel
    25ANSI1/4"725 7/8"Finished1/2"——2737T361000000
    25ANSI1/4"725 7/8"Finished5/8"3/16"3/32"2737T36200000
    25ANSI1/4"725 7/8"Finished3/4"3/16"3/32"2737T36300000
    25ANSI1/4"725 7/8"Finished7/8"3/16"3/32"2737T36400000
    25ANSI1/4"725 7/8"Finished1"1/4"1/8"2737T36500000
    25ANSI1/4"725 7/8"Finished1 1/4"1/4"1/8"2737T36600000
    25ANSI1/4"725 7/8"Finished1 3/8"5/16"5/32"2737T36700000
    35ANSI3/8"728 13/16"Finished3/4"3/16"3/32"2737T54100000
    35ANSI3/8"728 13/16"Finished7/8"3/16"3/32"2737T54200000
    35ANSI3/8"728 13/16"Finished1"1/4"1/8"2737T54300000
    35ANSI3/8"728 13/16"Finished1 1/4"1/4"1/8"2737T54400000
    35ANSI3/8"728 13/16"Finished1 3/8"5/16"5/32"2737T54500000
    35ANSI3/8"728 13/16"Finished1 1/2"3/8"3/16"2737T54600000
    40ANSI1/2"7211 3/4"Finished3/4"3/16"3/32"2737T573000000
    40ANSI1/2"7211 3/4"Finished7/8"3/16"3/32"2737T574000000
    40ANSI1/2"7211 3/4"Finished1"1/4"1/8"2737T575000000
    40ANSI1/2"7211 3/4"Finished1 1/4"1/4"1/8"2737T576000000
    40ANSI1/2"7211 3/4"Finished1 3/8"5/16"5/32"2737T577000000
    40ANSI1/2"7211 3/4"Finished1 1/2"3/8"3/16"2737T578000000
    41ANSI1/2"7211 3/4"Finished3/4"3/16"3/32"2737T737000000
    41ANSI1/2"7211 3/4"Finished1"1/4"1/8"2737T739000000
    41ANSI1/2"7211 3/4"Finished1 1/4"1/4"1/8"2737T741000000
    41ANSI1/2"7211 3/4"Finished1 1/2"3/8"3/16"2737T743000000
    50ANSI5/8"7214 11/16"Finished1"1/4"1/8"2741T401000000
    50ANSI5/8"7214 11/16"Finished1 1/8"1/4"1/8"2741T402000000
    50ANSI5/8"7214 11/16"Finished1 3/16"1/4"1/8"2741T403000000
    50ANSI5/8"7214 11/16"Finished1 1/4"1/4"1/8"2741T404000000
    50ANSI5/8"7214 11/16"Finished1 3/8"5/16"5/32"2741T405000000
    50ANSI5/8"7214 11/16"Finished1 7/16"3/8"3/16"2741T406000000
    50ANSI5/8"7214 11/16"Finished1 1/2"3/8"3/16"2741T407000000
    50ANSI5/8"7214 11/16"Finished1 5/8"3/8"3/16"2741T154000000
    50ANSI5/8"7214 11/16"Finished1 3/4"3/8"3/16"2741T408000000
    50ANSI5/8"7214 11/16"Finished1 15/16"1/2"1/4"2741T409000000
    60ANSI3/4"7217 5/8"Finished1 3/8"5/16"5/32"2741T137000000
    60ANSI3/4"7217 5/8"Finished1 7/16"3/8"3/16"2741T138000000
    60ANSI3/4"7217 5/8"Finished1 1/2"3/8"3/16"2741T139000000
    60ANSI3/4"7217 5/8"Finished1 5/8"3/8"3/16"2741T141000000
    60ANSI3/4"7217 5/8"Finished1 3/4"3/8"3/16"2741T142000000
    60ANSI3/4"7217 5/8"Finished1 15/16"1/2"1/4"2741T143000000
    60ANSI3/4"7217 5/8"Finished2"1/2"1/4"2741T144000000
    60ANSI3/4"7217 5/8"Finished2 3/16"1/2"1/4"2741T145000000
    60ANSI3/4"7217 5/8"Finished2 7/16"5/8"5/16"2741T146000000
     

    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 Product. Front orientation. Timing Belt Drive Pulleys. Precision High-Torque GT Timing Belt Pulleys, Bushing Bore.

    Bushing 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.
    Iron—Strong but best for dry environments since moisture will cause them to rust.
    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.
    Bushing Bore—Quickly swap or service parts in tight spaces—no press-fitting or special tools required. Mount a bushing (sold separately) on your shaft and slide the pulley over it. As you tighten the included set screws, the bushing grips the shaft and draws it into the pulley, creating a final hold that is more secure than with set screws alone.
    For
    Bushing
    For Max.
    Belt Wd., mm
    Pitch,
    mm
    No. of
    Teeth
    Bore
    Type
    For Shaft
    Dia.
    Type
    Trade
    No.
    Pitch Dia.,
    mm
    No. of
    Flanges
    Hub
    Type
    Each
    For 2MGT Trade Size
     
    Corrosion-Resistant Aluminum
    6272Finished1/4"——45.8—Standard3764N119000000
     
    For 3MGT Trade Size
     
    Corrosion-Resistant Aluminum
    9372Finished5/16"——68.8—Standard3764N14700000
     
    For 14MGT Trade Size
     
    Iron
    401472Bushing—Taper Lock3020320.92—3764N175000000
     
    Bushings
    Image of Product. Front orientation. Pulley and Sprocket Bushings. Taper-Lock Bushing.

    Taper-Lock

    Bushing

    Bushing
    Type
    Trade
    No.
    For Shaft
    Dia.
    Each
    Taper Lock30201"57095K314000000
    Taper Lock30201 1/8"57095K31800000
    Taper Lock30201 1/4"57095K31700000
    Taper Lock30201 3/8"57095K32500000
    Taper Lock30201 7/16"57095K32800000
    Taper Lock30201 1/2"57095K31600000
    Taper Lock30201 5/8"57095K32700000
    Taper Lock30201 3/4"57095K32400000
    Taper Lock30201 7/8"57095K32900000
    Taper Lock30201 15/16"57095K32200000
    Taper Lock30202"57095K33300000
    Taper Lock30202 1/8"57095K33700000
    Taper Lock30202 3/8"57095K34400000
    Taper Lock30202 7/16"57095K34700000
    Taper Lock30202 1/2"57095K33500000
    Taper Lock30202 3/4"57095K34300000
    Taper Lock30202 7/8"57095K34800000
    Taper Lock30202 15/16"57095K34100000
    Taper Lock30203"57095K35200000
    Taper Lock302040 mm57095K35700000
    Taper Lock302048 mm57095K36100000
    Taper Lock302055 mm57095K36300000

    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
    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
    6
    		72:17214 1/2°12"112.37"1"2.25"1 1/4"3"1.25"Cast IronRight Hand
    		Not HardenedUnfinished57545K2440000000
     

    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.

    20° Pressure Angle

    Round Bore

    Gear with Round

    Bore and Set Screw

    Image of Product. Gear with Round or Round/Machinable Bore. Back orientation. Spur Gears. Metal Spur Gears, 14 1/2° Pressure Angle, Round/Plain Bore.
    Image of Product. Gear with Keyed Bore and Set Screw. Back orientation. Spur Gears. Metal Spur Gears, 14 1/2° Pressure Angle, Keyed Bore with Set Screw.

    Gear with Round

    or

    Round/Machinable

    Bore

    Gear with Keyed

    Bore and Set Screw

    20° Pressure Angle—The current industry standard, these 20° pressure angle spur gears have thicker, stronger teeth than 14½° pressure angle gears.
    14 1/2° Pressure Angle—A former industry standard, 14½° pressure angle gears are often found in older machinery.
    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.
    Plain Bore—Gears with a plain bore have a large hub diameter so you can machine them to fit your shaft.
    Hub
    Keyway
    Gear
    Pitch
    Gear
    Module
    No. of
    Teeth
    Gear Pitch
    Dia.
    OD
    Face
    Wd.
    Dia.
    Wd.
    Bore Type
    For Shaft
    Dia.
    Wd.
    Dp.
    Tooth Heat
    Treatment
    Material
    Each
    20° Pressure Angle
     
    Steel
    —1
    		7272 mm74 mm10 mm40 mm10 mmRound Bore10 mm——Not HardenedBlack-Oxide 1045 Carbon Steel2664N372000000
     
    Stainless Steel
    32
    		—722 1/4"2.31"3/16"0.5"0.25"Round Bore with Set Screw1/4"——Not Hardened303 Stainless Steel6832K5800000
     
    14 1/2° Pressure Angle
     
    Steel
    24
    		—723"3.08"1/4"1.375"0.5"Round/Plain Bore1/2" to 13/16"——Not Hardened1144 Carbon Steel6325K6700000
    24
    		—723"3.08"1/4"1.375"0.5"Keyed Bore with Set Screw1/2"0.125"0.063"Not Hardened1144 Carbon Steel6867K25000000
     
    Gear Racks
    Image of Product. Front orientation. Spur Gear Racks. Metal Spur Gears, 20° Pressure Angle—Rectangular.
    Image of Product. Front orientation. Spur Gear Racks. Metal Spur Gears, 20° Pressure Angle—Round.

    20° Pressure Angle—Rectangular

    20° Pressure Angle—Round

    Image of Product. Front orientation. Spur Gear Racks. Metal Spur Gears, 14 1/2° Pressure Angle—Rectangular.

    14 1/2° 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.
    Gear
    Pitch
    Gear
    Module
    Lg.
    Pitch
    Ht.
    Ht.
    Face
    Wd.
    Dia.,
    mm
    Tooth Heat
    Treatment
    Material
    No. of Mounting
    Holes
    Each
    20° Pressure Angle—Rectangular
     
    Steel
    —1
    		100 mm11 mm12 mm10 mm—Not HardenedBlack-Oxide 1045 Carbon Steel—2485N217000000
    —1
    		300 mm11 mm12 mm10 mm—Not HardenedBlack-Oxide 1045 Carbon Steel—2485N21800000
    —1
    		500 mm8.8 mm9.8 mm10 mm—Not Hardened1045 Carbon Steel—2485N20100000
    —1
    		1,000 mm8.8 mm9.8 mm10 mm—Not Hardened1045 Carbon Steel—2485N202000000
     
    Stainless Steel
    32
    		—18"0.449"1/2"1/4"—Not Hardened416 Stainless Steel—6832K75000000
     
    20° Pressure Angle—Round
     
    Steel
    —1
    		500 mm9 mm——10Not HardenedBlack-Oxide 1045 Carbon Steel—2485N226000000
     
    14 1/2° Pressure Angle—Rectangular
     
    Steel
    24
    		—2 ft.0.208"1/4"1/4"—Not Hardened1018 Low-Carbon Steel—6295K1200000
    24
    		—4 ft.0.208"1/4"1/4"—Not Hardened1018 Low-Carbon Steel125170T1000000
    24
    		—4 ft.0.208"1/4"1/4"—Not Hardened1215 Carbon Steel—6295K23200000
    24
    		—6 ft.0.208"1/4"1/4"—Not Hardened1215 Carbon Steel—6295K23300000
     
    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
    1
    		6060905810Not HardenedBlack-Oxide 1045 Carbon Steel2696N27000000
    1
    		1001001309810Not HardenedBlack-Oxide 1045 Carbon Steel2696N26000000
     

    Timing Belt Pulleys

    Image of Product. Front orientation. Timing Belt Drive Pulleys. Timing Belt Pulleys, Finished Bore.

    Finished Bore

    Image of Attribute. Front orientation. Contains Annotated, Border. Timing Belt Pulleys.
    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.
    Steel—Strong but best for dry environments since moisture will cause them to rust.
    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.
    Pitch
    No. of
    Teeth
    Bore
    Type
    For Shaft
    Dia.
    Pitch
    Dia.
    Hub
    Type
    Each
    For MXL Trade Size
     
    Corrosion-Resistant Aluminum
    9 mm0.080"72Finished6 mm46.6 mmStandard1375K161000000
     
    For XL Trade Size
     
    Steel
    3/8"0.200"72Finished3/8"4.584"Standard6495K73300000
     
    Corrosion-Resistant Aluminum
    3/8"0.200"72Finished12 mm4.58"Standard1277N73400000
     

    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.
    Brass—Brass gears are easy to machine, so you can add your own mounting holes and make other alterations. They won't rust when exposed to water.
    Gear
    Pitch
    No. of
    Teeth
    Gear Pitch
    Dia.
    OD
    ID
    Face
    Wd.
    Material
    Each
    20° Pressure Angle
     
    Brass
    24
    		723"3.75"2.95"1/4"Brass2696N30000000
     

    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, 14 1/2° Pressure Angle, Round Bore.

    14 1/2° Pressure

    Angle, Round Bore

    14 1/2° Pressure Angle—A former industry standard, 14½° pressure angle gears are often found in older machinery.
    Nylon—Nylon gears are wear resistant, but will swell and weaken over time when wet.
    Hub
    Gear
    Pitch
    No. of
    Teeth
    Gear Pitch
    Dia.
    OD
    Face
    Wd.
    Dia.
    Wd.
    Bore Type
    For Shaft
    Dia.
    Color
    Each
    14 1/2° Pressure Angle
     
    Nylon
    48
    		721 1/2"1.54"1/8"0.625"0.25"Round Bore1/4"White57655K28000000
     
    Gear Racks
    Image of Product. Front orientation. Spur Gear Racks. Plastic Spur Gears, 14 1/2° Pressure Angle—Rectangular.

    14 1/2° 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.
    Nylon—Nylon gear racks are wear resistant, but will swell and weaken over time when wet.
    Gear
    Pitch
    Lg.,
    ft.
    Pitch
    Ht.
    Ht.
    Face
    Wd.
    Fabrication
    Color
    Each
    14 1/2° Pressure Angle—Rectangular
     
    Nylon
    48
    		10.109"1/8"1/8"MoldedWhite57655K61000000
     
    back to top