McMaster-Carr logo
    Filter by
    System of Measurement
    Shaft Mount Type
    Shaft Type
    For Shaft Misalignment Type
    Shaft Coupling Flexibility
    Number of Clamping Screws Included
    Clamping Screw Type
    Number of Set Screws Included
    Component
    Clamping Screw Material
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Flexible Shaft Coupling Type
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    42 Products

    Clamping Vibration-Damping Precision Flexible Shaft Couplings

    Image of System. Front orientation. Contains Annotated. Flexible Shaft Couplings. Clamping Vibration-Damping Precision Flexible Shaft Couplings.
    Image of System. (Each Component Sold Separately). Front orientation. Exploded view. Contains Annotated, MultipleImages. Flexible Shaft Couplings. Clamping Vibration-Damping Precision Flexible Shaft Couplings.

    (Each Component Sold

    Separately)

    Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).
    A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are lightweight, corrosion-resistant aluminum. Spiders are polyurethane for fair vibration damping and good chemical resistance.
    Hubs
    Durometer 98A Polyurethane Spiders
    Durometer 92A Polyurethane Spiders
    Durometer 85A Polyurethane Spiders
    Misalignment Capability
    Misalignment Capability
    Misalignment Capability
    Overall
    Lg.
    OD
    For Shaft
    Type
    For Rotary Motion
    For Shaft
    Dia., mm
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
     
    2024 Aluminum Hubs
    1 7/64"3/4"RoundForward/Reverse, Start/Stop79845T10000008,000300.003"0.8°0 to 1809845T110000008,000180.004"0.9°0 to 1809845T120000008,000100.005"0 to 1809845T13000000
    1 13/32"1"RoundForward/Reverse, Start/Stop79845T2000008,0001500.003"0.8°0 to 1809845T14000008,000580.005"0.9°0 to 1809845T15000008,000300.006"0 to 1809845T1600000
     

    Clamping High-Parallel-Misalignment Flexible Shaft Couplings

    Image of System. Components of a Coupling Shown Assembled. Front orientation. Contains Annotated. Flexible Shaft Couplings. Clamping High-Parallel-Misalignment Flexible Shaft Couplings.
    Image of System. (Each Component Sold Separately). Front orientation. Exploded view. Contains Annotated, MultipleImages. Flexible Shaft Couplings. Clamping High-Parallel-Misalignment Flexible Shaft Couplings.

    Components of a

    Coupling Shown

    Assembled

    (Each Component Sold

    Separately)

    Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure. Also known as Oldham couplings, they have a slotted disc that allows hubs to slide independently—good for applications with parallel shaft misalignment. They also allow zero backlash (no play) and never need lubrication.
    A complete coupling consists of two hubs and one disc (each component sold separately).
    303 Stainless Steel—303 stainless steel hubs offer excellent corrosion resistance.
    2024 Aluminum—2024 aluminum hubs are lightweight and have good corrosion resistance.
    Acetal Disc—Acetal discs stand up to high twisting forces.
    Nylon Disc—Nylon discs have excellent vibration and shock absorption.
    PEEK Disc—PEEK discs have excellent impact resistance and the chemical resistance to withstand a variety of acids and other harsh substances.
    Hubs
    Acetal Discs
    Nylon Discs
    PEEK Discs
    Misalignment Capability
    Misalignment Capability
    Misalignment Capability
    Overall
    Lg.
    OD
    For Shaft
    Type
    For Rotary Motion
    For Shaft
    Dia., mm
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Axial
    Temp. Range,
    ° F
    Disc
    Material
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Axial
    Temp. Range,
    ° F
    Disc
    Material
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Axial
    Temp. Range,
    ° F
    Disc
    Material
    Each
     
    303 Stainless Steel Hubs
    1"3/4"RoundForward/Reverse, Start/Stop79889T820000004,500200.008"0.5°0.004"-10 to 150Acetal
    59985K62000004,50050.008"0.5°0.004"-10 to 130Nylon
    59985K920000004,500200.008"0.5°0.004"-10 to 300PEEK
    59985K711000000
     
    2024 Aluminum Hubs
    1"3/4"RoundForward/Reverse, Start/Stop79889T1000004,500200.008"0.5°0.004"-10 to 150Acetal
    59985K6200004,50050.008"0.5°0.004"-10 to 130Nylon
    59985K92000004,500200.008"0.5°0.004"-10 to 300PEEK
    59985K71100000
     

    Set Screw Vibration-Damping Precision Flexible Shaft Couplings

    Image of Product. (Each Component Sold Separately). Front orientation. Contains Annotated. Flexible Shaft Couplings. Set Screw Vibration-Damping Precision Flexible Shaft Couplings.
    Image of Product. Components of a Coupling Shown Assembled. Front orientation. Contains Annotated. Flexible Shaft Couplings. Set Screw Vibration-Damping Precision Flexible Shaft Couplings.

    (Each Component Sold Separately)

    Components of a

    Coupling Shown

    Assembled

    The included set screw holds the coupling in place. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).
    A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are lightweight, corrosion-resistant aluminum. Spiders are polyurethane for fair vibration damping and good chemical resistance.
    Hubs
    Durometer 98A Polyurethane Spiders
    Durometer 92A Polyurethane Spiders
    Durometer 85A Polyurethane Spiders
    Misalignment Capability
    Misalignment Capability
    Misalignment Capability
    Overall
    Lg., mm
    OD,
    mm
    For Shaft
    Type
    For Rotary Motion
    For Shaft
    Dia., mm
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Each
     
    2024 Aluminum Hubs
    2719RoundContinuous, Forward/Reverse, Start/Stop79939T320000008,000300.003"0.8°0 to 1809845T110000008,000180.004"0.9°0 to 1809845T120000008,000100.005"0 to 1809845T13000000
     

    Clamping Precision Flexible Shaft Couplings

    Image of Product. Front orientation. Flexible Shaft Couplings. Clamping Precision Flexible Shaft Couplings, Spiral Cut.

    Spiral Cut

    Image of Product. Front orientation. Flexible Shaft Couplings. Clamping Precision Flexible Shaft Couplings, Parallel Cut.

    Parallel Cut

    Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure.
    Spiral Cut—Spiral couplings have long cuts in their body for flexibility to handle parallel, axial, and angular misalignment better than parallel couplings. However, they’re not as rigid. Often used for light duty encoder and stepper drive applications, they allow zero backlash (no play) and never need lubrication. They’re also known as helical beam couplings.
    Parallel Cut—Parallel couplings have short, intermittent cuts that make them more rigid and able to handle more torque and speed than spiral couplings, but they’re worse at correcting misalignment. Use them in high-torque applications, such as linear test systems and scientific instruments. They’re sometimes called slit couplings.
    7075 Aluminum—7075 aluminum couplings are lightweight with good corrosion resistance.
    303 Stainless Steel—303 stainless steel couplings offer excellent corrosion resistance.
    Misalignment
    Capability
    For Shaft
    Diameter
    Overall
    Lg., mm
    OD,
    mm
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel,
    mm
    Angular
    Axial,
    mm
    For Rotary Motion
    Each
    Spiral Cut
     
    7075 Aluminum
    7 mm × 1/4"30256,000270.380.25Forward/Reverse, Start/Stop2464K18000000
    7 mm × 3/8"30256,000270.380.25Forward/Reverse, Start/Stop2464K2400000
    7 mm × 6 mm30256,000270.380.25Forward/Reverse, Start/Stop2463K2500000
    7 mm × 7 mm30256,000270.380.25Forward/Reverse, Start/Stop2463K2600000
    8 mm × 7 mm30256,000270.380.25Forward/Reverse, Start/Stop2463K2700000
    9 mm × 7 mm30256,000270.380.25Forward/Reverse, Start/Stop2463K3100000
    10 mm × 7 mm30256,000270.380.25Forward/Reverse, Start/Stop2463K3500000
     
    303 Stainless Steel
    7 mm × 10 mm30256,000400.380.25Forward/Reverse, Start/Stop2463K313000000
     
    Parallel Cut
     
    7075 Aluminum
    7 mm × 5 mm19.81610,00011.10.12.5°0.4Forward/Reverse, Start/Stop8011N228000000
    7 mm × 5 mm21.5207,50021.70.120.5Forward/Reverse, Start/Stop8011N251000000
    7 mm × 7 mm19.81610,00011.10.12.5°0.4Forward/Reverse, Start/Stop8011N23000000
    10 mm × 7 mm34255,00034.50.40.7Forward/Reverse, Start/Stop8011N173000000
     

    Set Screw Flexible Shaft Couplings

    Image of System. Hubs, Split Spider, and Retaining Ring Shown Assembled. Front orientation. Contains Annotated. Flexible Shaft Couplings. Set Screw Flexible Shaft Couplings.
    Image of System. (Each Component Sold Separately). Front orientation. Contains Annotated. Flexible Shaft Couplings. Set Screw Flexible Shaft Couplings.

    Hubs, Split Spider, and

    Retaining Ring Shown

    Assembled

    (Each Component Sold

    Separately)

    Image of System. Hubs and Spider Shown Assembled. Front orientation. Contains Annotated. Flexible Shaft Couplings. Set Screw Flexible Shaft Couplings.
    Image of System. (Each Component Sold Separately). Front orientation. Exploded view. Contains Annotated. Flexible Shaft Couplings. Set Screw Flexible Shaft Couplings.

    Hubs and Spider Shown

    Assembled

    (Each Component Sold

    Separately)

    Each hub includes a set screw (unless noted), which bites into your shaft to hold the coupling in place. Also known as Lovejoy® couplings, these three-piece couplings have a spider-shaped cushion between two hubs to reduce shock and handle minor shaft misalignment.
    A complete coupling consists of two hubs and one spider, or two hubs, one split spider, and one retaining ring (all components sold separately). Split spiders are easier to install and replace than standard spiders because there’s no need for tools or removing your hubs. Twist-lock them in place using a retaining ring.
    Buna-N—Buna-N spiders provide good vibration damping and chemical resistance.
    Hytrel—Hytrel spiders provide fair vibration damping and excellent chemical resistance.
    Hubs
    Buna-N Spiders
    Hytrel Spiders
    Misalignment Capability
    Misalignment Capability
    Overall
    Lg., mm
    OD,
    mm
    For Shaft
    Type
    For Rotary Motion
    For Shaft
    Dia., mm
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Spider
    Material
    Each
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Temp. Range,
    ° F
    Spider
    Material
    Each
     
    Steel Hubs
    4427RoundForward/Reverse, Start/Stop76133N120000018,000260.015"-40 to 212Buna-N
    6408K840000018,000500.015"0.5°-55 to 245Hytrel6408K91000000
     

    High-Speed Servomotor Precision Flexible Shaft Couplings

    Image of Product. Front orientation. Flexible Shaft Couplings. High-Speed Servomotor Precision Flexible Shaft Couplings.
    Connect shafts and ball screws to high-speed servomotors and stepper motors—these shaft couplings handle four times more speed than standard servomotor couplings. They’re often found on high-torque motors that frequently start and stop, such as those used with packaging machines, press brakes, and semiconductor manufacturing equipment.
    With aluminum hubs joined by a flexible fluoroelastomer or Buna-N core, these shaft couplings dampen vibration and adjust for misalignment. When machines accelerate and decelerate quickly, these couplings remain stiff to maintain accuracy and repeatability, which prevents equipment from moving out of place. They also resist backlash, meaning all of the turning force from the motor is passed on to the connected shaft. The core resists water, petroleum-based chemicals, and inorganic acids while also insulating bearings, encoders, and other shaft components from stray electric current. Clamping screws provide hold without marring shafts; they’re useful in applications where shafts are frequently assembled and disassembled.
    Misalignment
    Capability
    For Shaft
    Diameter
    Overall
    Lg.
    OD
    Max. Rotation
    Speed, rpm
    Max. Torque,
    in·lbf
    Parallel
    Angular
    Axial
    For Rotary Motion
    Each
    2017 Aluminum with Fluoroelastomer Center
    5 mm × 7 mm1 1/32"3/4"30,000180.006"1.5°0.008"Forward/Reverse, Start/Stop6853N11000000
    6 mm × 7 mm1 1/32"3/4"30,000180.006"1.5°0.008"Forward/Reverse, Start/Stop6853N11200000
     

    Set Screw Shaft Collars

    Image of Product. Front orientation. Shaft Collars. Set Screw Shaft Collars.
    Slide these traditional collars from one end of the shaft and tighten the set screw. They dig into the shaft for a secure hold, but one that leaves a gouge. For maximum holding power, make sure the set screw is harder than the shaft.
    Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.
    Blue Passivated Zinc-Plated Carbon Steel—Withstand moisture and mild chemicals better than standard zinc-plated-steel collars. The blue passivated finish makes it easy to identify metric collars at a glance.
    Carbon Steel—Strong and easy to machine. Use in dry environments, since moisture will cause steel to rust.
    303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.
    Set
    Screw
    For Shaft
    Dia., mm
    OD,
    mm
    Wd.,
    mm
    Type
    No.
    Included
    Each
    Blue Passivated Zinc-Plated Carbon Steel
    7128Hex Socket16057N1500000
     
    Carbon Steel
    7128Hex Socket16056N150000
     
    303 Stainless Steel
    7128Hex Socket16058N150000
     

    Plastic Shaft Collars

    Image of Product. Front orientation. Shaft Collars. Plastic Shaft Collars.
    Lightweight alternatives to metal collars for weight-sensitive applications. Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.
    Acetal—Resist swelling when exposed to moisture.
    Clamping
    Screw
    For Shaft
    Dia., mm
    OD,
    mm
    Wd.,
    mm
    Type
    No.
    Included
    Each
    Acetal
    7189Socket Head13761N116000000
     

    Plastic Two-Piece Shaft Collars

    Image of Product. Front orientation. Shaft Collars. Plastic Two-Piece Shaft Collars.
    Lightweight alternatives to metal two-piece collars for weight-sensitive applications. Attach these collars anywhere along a shaft when other components are already installed or you can't access the ends. They clamp firmly and evenly without marring the shaft, so you can reposition or remove them later.
    Acetal—Resist swelling when exposed to moisture.
    Clamping
    Screw
    For Shaft
    Dia., mm
    OD,
    mm
    Wd.,
    mm
    Type
    No.
    Included
    Each
    Acetal
    7189Socket Head23585N27000000
     

    Shaft Collars

    Image of Product. Front orientation. Shaft Collars.
    Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.
    Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.
    303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.
    Clamping
    Screw
    For Shaft
    Dia., mm
    OD,
    mm
    Wd.,
    mm
    Type
    No.
    Included
    Each
    Black-Oxide Carbon Steel
    7189Socket Head157445K41100000
     
    303 Stainless Steel
    7189Socket Head19616T41100000
     

    Two-Piece Shaft Collars

    Image of Product. Front orientation. Shaft Collars. Two Piece, For Round Shafts.

    For Round Shafts

    Attach these collars anywhere along your shaft, which helps when other components are already installed or you can't access the end. They clamp firmly and evenly without marring the shaft, so you can reposition or remove collars later.
    Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.
    Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.
    316 Stainless Steel—More corrosion resistant than 303 stainless steel collars. These collars withstand salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.
    Black Anodized Aluminum—One-third the weight of steel and more corrosion resistant than unfinished aluminum.
    Clamping
    Screw
    For Round Shafts
    For Shaft
    Dia., mm
    OD,
    mm
    Wd.,
    mm
    Type
    No.
    Included
    Each
    Black-Oxide Carbon Steel
    7189Socket Head26063K27000000
     
    Zinc-Plated Carbon Steel
    7189Socket Head25731N1200000
     
    316 Stainless Steel
    7189Socket Head29652T3300000
     
    Black Anodized Aluminum
    7189Socket Head23731N1500000
     
    back to top