Zero Backlash Couplings - DieQua Corporation
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Series MK - Zero Backlash Miniature Metal Bellows Couplings

The R+W miniature metal bellows couplings featured in the MK series were developed for coupling applications with potentiometers, tachogenerators, angle encoders, and small, highly dynamic servo drives. These high quality compact couplings guarantee high precision, backlash-free angular motion transmission, particularly in closed loop situations.

Features & Benefits:
  • 8 Models: Provides a variety of connection options. All models rated for speeds up to 10,000 rpm.
  • Zero Backlash: Provides exact position and rotary motion.
  • High Torsional Rigidity: Maintains exact position when starting and stopping.
  • Low Inertia: Allows faster acceleration and deceleration with lower torque.
  • Compensates Misalignment: Allows axial, lateral, and angular misalignment for easier mounting.
  • Maintenance Free: No moving parts means an unlimited life with proper mounting.
  • Materials: Bellows are made of flexible, high-grade stainless steel. The hubs are made from aluminum or steel, depending on size. Hubs in stainless steel are also available.
  • Non-Standard Applications: Custom designs, with varied tolerances, keyways, non standard material and bellows, are available upon request. Also available as ATEX version for appplications in explosive atmospheres.
Product Line Overview: Models BKL003 - MK1 - MK2 - MK3 - MK4 - MK5 - MK6 - FK1

Model BKL003 - Economy Class Miniature Coupling with Clamping Hub
(1 size with rated torque of up to 3 Nm)

Design Description: A very economical bellows shaft coupling with single screw clamping hub.

Bore Diameters: Available in these bore sizes only: Metric - 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 mm. Inch - 0.1875, 0.25, 0.375, and 0.5 inches. Keyways are not available on this model.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Application Example:

Model MK1 - Miniature Shaft Coupling with Radial Set Screws
(8 sizes with rated torque from 0.05-10 Nm)

Design Description: A simple and economical bellows shaft coupling with set screw connection. A dismounting groove is incorporated to aid removal from shaft.

Bore Diameters: Metric or inch bores from 1-28 mm, or 0.047-1.0 inches. Optional keyways available upon request.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK1-0.5, MK1-1, MK1-5, MK1-10, MK1-15, MK1-20, MK1-45, MK1-100

Application Example:

Model MK2 - Miniature Coupling with Clamping Hub
(6 sizes with rated torque from 0.5-10 Nm)

Design Description: A stainless steel bellows shaft coupling with single screw clamping hub suitable for highly dynamic applications.

Bore Diameters: Metric or inch bores from 3-24 mm, or 0.125-.0875 inches. Optional keyways are available upon request.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK2-5, MK2-10, MK2-15, MK2-20, MK2-45, MK2-100

Application Example:

Model MK3 - Miniature Coupling with Expanding Shaft
(6 sizes with rated torque from 0.5-10 Nm)

Design Description: A unique bellows coupling design with an expanding shaft on one side, for connecting to a hollow bore, and a standard single screw clapming hub on the other. Ideal for connecting encoders, or other small shafts, to larger shafts.

Bore Diameters: The expanding shaft has a standard metric dimension for each size. The clamping hub side has capabilities from 3-24 mm, or 0.125-0.875 inches, with an optional keyway.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK3-5, MK3-10, MK3-15, MK3-20, MK3-45, MK3-100

Application Example:

Model MK4 - Miniature Bellows Coupling with Radial Set Screws and Taper-Fit Connection
(5 sizes with rated torque from 0.5-10 Nm)

Design Description: A unique two piece bellows coupling with a taper fit element for blind mounting where access to the tightening screws is difficult or impossible. Shaft connection is via set screws.

Bore Diameters: Metric or inch bores from 3-28 mm, or 0.125-1.0 inches, on the female bellows side. Metric or inch bores from 3-20 mm, or 0.125-0.75 inches, on the male taper hub side. Optional keyways are available, but may significantly limit bore capacities.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK4-5, MK4-15, MK4-20, MK4-45, MK4-100

Application Example:

Model MK5 - Miniature Bellows Coupling with Clamping Hub and Taper-Fit Connection
(5 sizes with rated torque from 0.5-10 Nm)

Design Description: A unique two piece bellows coupling with a taper fit element for blind mounting where access to the tightening screws is difficult or imppossible. Shaft connection is via single screw split clamping hub.

Bore Diameters: Metric or inch bores from 3-20 mm, or 0.125-0.75 inches. Keyways are available upon request, but may significantly reduce the bore capacity.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK5-5, MK5-15, MK5-20, MK5-45, MK5-100

Application Example:

Model MK6 - Miniature Coupling with Clamping Hub, Expanding Shaft, and Taper-Fit Connection
(5 sizes with rated torque from 0.5-10 Nm)

Design Description: A unique two piece bellows coupling with tapered element for blind mounting. Also includes an expanding shaft on one side, for connecting to a hollow bore, and a single screw split clamping hub on the other side. Ideal for connecting encoders to large shafts.

Bore Diameters: The expanding shaft has a fixed diameter per size. The male taper hub allows metric or inch shafts from 3-20 mm, or 0.125-0.75 inches.

Temperature Range: -30° C to +120° C (3.6° F to 270° F). High temperature options available.

Sizes: MK6-5, MK6-15, MK6-20, MK6-45, MK6-100

Application Example:

Model FK1 - Microflex Elastomer Coupling
(1 size with rated torque of up to 1 Ncm)

Design Description: A micro sized shaft coupling with a polymer flexible element and stainless steel hubs. Shaft connection is via set screws. Ideal for instrumentation and medical applications.

Bore Diameters: Metric or inch bores up to 1.5 mm, or 0.047 inches.

Temperature Range: -35° C to +90° C (-31° F to 194° F).

What's Next?
Email Your Application
Download This Catalog
Download CAD Drawings
Download Coupling Overview

Why Choose DieQua?

Have Any Questions?
Call Us: 630-980-1133

Quick Assist:
Installation & Maintenance Instructions
Application Examples
Advantages of MK Couplings in an Encoder

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Related Products:
Bellows Couplings
Elastomer Insert Couplings
Miniature Couplings
Torque Limiters
Line Shafts

Coupling Overview:

Download Coupling Overview
PDF - 384KB


Optional: Bellows Couplings made of Stainless Steel


Sample Applications:
Measurement Systems
Optical Encoders
Potentiometers
Small Servo Motors
Stepper Motors
Tachometers
and more...

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Bloomingdale, IL 60108-3105
Phone: 630-980-1133 Fax: 630-980-1232

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