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Couplings and Universal Joints

Couplings and Universal Joints


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Precision Bellows Couplings

Precision Bellows Couplings


SDP/SI Bellows Couplings are flexible couplings designed to accommodate various types of load conditions. SDP/SI Hi-Flex Bellows Couplings are used for applications which require large amounts of shaft misalignment combined with low resultant radial loads on the bearings. SDP/SI Modular Bellows Couplings are configurable and provide high torsional rigidity for high speed torque transmission. A wide variety of bore sizes and combinations are offered to accommodate specific needs.


Commercial and Precision Flexible Couplings

Commercial & Precision Flexible Couplings


Flexible Couplings have the ability to compensate for shaft misalignment and are designed to accommodate various types of load conditions. No one type of coupling can provide the universal solution to all coupling problems; hence many designs are available, each possessing construction features to accommodate one or more types of application requirements. SDP/SI offers many styles of flexible couplings, such as bellows couplings, helical couplings, Oldham couplings, universal joints, and flexible shafts.

Commercial and Precision Flexible Couplings

Precision Flexible Antivibration Couplings


For position accuracy and vibration reduction in a servo system, these couplings solve misalignment challenges in response-mandatory servo systems designed for the
semiconductor manufacturing equipment industry, scanning equipment and many automation applications. Standard sizes available in bores 3 mm thru 16 mm. Call for custom requirements.

Commercial and Precision Helical Couplings

Commercial and Precision Helical Couplings


SDP/SI Helical Couplings, or beam couplings, are another type of flexible coupling allowing for axial motion, angular misalignment and parallel offset. This coupling design features one-piece construction resulting in zero backlash. The coupling is made flexible by removing material from the piece in a spiral pattern. SDP/SI Helical Couplings are available in aluminum and stainless steel.

Precision Junior (BoWex Nylon) Couplings

Precision Junior (BoWex Nylon) Couplings


Two-and Three-Piece Junior Coupling is a curved tooth gear coupling made of nylon. Designed to compensate for axial, radial and angular misalignment, it is lightweight and maintenance free.




Precision Magnetic Couplings

Precision Magnetic Couplings


Precision Miniature Ball Couplings

Precision Miniature Ball Couplings


Precision Multi-Jawed Couplings

Precision Multi-Jawed Couplings


SDP/SI Precision Multi-jawed Coupling is a rigid coupling that accommodates minimal shaft misalignment. The helical gear coupling enables a positive connection between two shafts that can be disconnected or connected at any time when stopped.










Commercial and Precision Oldham Couplings

Commercial & Precision Oldham Couplings


Oldham Couplings consist of three members. A floating member is trapped by 90° displaced grooves between the two outer members which connect to the drive shafts. Oldham Couplings can accommodate lateral shaft misalignments up to 10% of nominal shaft diameters and up to 3° angular misalignments. Lubrication is a problem but can in most applications be overcome by choosing a coupling that uses a wear resistant plastic or an elastomer in place of steel or bronze floating members.

Commercial and Precision Rigid Couplings

Commercial & Precision Rigid Couplings


Rigid Couplings have limited applications as compared to flexible couplings. Rigid couplings do not have the ability to compensate for shaft misalignments and are therefore used where shafts are already positioned in precise lateral and angular alignment. Rigid couplings because of their simple rugged design are generally able to transmit more power than flexible couplings of comparable size but this is not an important advantage except in high horsepower applications.

Precision Slip-Type Couplings

Precision Slip-Type Couplings


SDP/SI Slit Type Couplings are a flexible coupling designed similarly to the helical coupling or beam coupling; one piece construction and no backlash. The Slit Type Coupling features high torque capacity, high flexibility, and high torsional stiffness. Manufactured in aluminum, stainless steel and engineered polymer.








Commercial Flexible Shafts with Casing

Commercial Flexible Shafts with Casing


Commercial Flexible Shafts without Casing

Commercial Flexible Shafts without Casing


Commercial Metal Universal Joints

Commercial Metal Universal Joints


Single and double joint stainless steel and alloy steel universal joints are offered with a variety of bore sizes. Miniature universal joints feature zero backlash, sealed-in lubrication and low inertia. Inverted design universal joints are small in size and lightweight for given torque capacity. These joints may be made into telescoping units by mating them with telescoping miniature ball splines.

Commercial Plastic Universal Joints

Commercial Plastic Universal Joints


Plastic universal joints are inexpensive, dampen vibration, electrically insulating, and are well suited for low torque applications. We offer a wide variety of sizes and styles as standard catalog items. We can also manufacture them to specific requirements, please consult SDP/SI Engineering for further details.



Commercial and Precision Telescoping Universal Joints

Commercial & Precision Telescoping Universal Joints


Stainless steel telescoping universal joints are offered in a number of sizes and are heat and corrosion resistant. Telescoping miniature universal joints feature zero backlash and accommodate 1/4 axial motion. Molded universal joints with a molded slide extension or brass slide extension are available in a variety of sizes, shorter or longer lengths are available on special order.

Precision Zero Backlash Universal Joints

Precision Zero Backlash Universal Joints



Gears, Differentials, Pinions, and Racks Timing Belt, Pulley, Sprocket,
and Chain Drives
Couplings and Universal Joints Shafts & Shaft Accessories Bearings & Bearing Maintenance Tools Motors, Gearheads and Motion Control Speed Reducers and
Right Angle Gear Drives
Clutches & Brakes Linear Guide Components Vibration & Shock Mounts Hardware, Fasteners & Misc. Components

Bellows Couplings:
Good misalignment capability and excellent torsional rigidity and torque capacity. Available with Fairloc® hub.

Flexible Couplings:
Long Series Helical Couplings, Slit Type MSC Flexible Couplings and Slit Type Plastic Couplings. They provide excellent misalignment capability and good vibration damping.

Disc Couplings:
Excellent torsional rigidity and torque capacity with good misalignment capability. Precision Oldham Couplings & Standard Oldham Couplings: Good to excellent misalignment capability. The standard style features different bore combinations and are ease of assembly.

Jaw Couplings:
High torque capacity with good vibration damping.
Rigid Shaft Couplings: High torque capacity and torsional rigidity. Available with our Fairloc® hub.

Magnetic Disk Couplings:
Good misalignment capability and performance in high temperatures.

Neo-flex Couplings:
Provides shaft-to-shaft insulation and torsional vibration isolation. Available with the Fairloc® hub.

Precision Shaft Couplings:
Made of 303 Stainless Steel. Can be ordered with other bore sizes to fit your specifications.

We Also Offer Flexible Shafts:
Flexible Shafts are used in cases where a solid shaft is impractical, such as when there are obstacles in the way. The flexible shaft can be routed around, over and under the obstacle to fit your design. Off-the-shelf or made to your exact specifications, many combinations of fittings and lengths are available.