Rodless screw actuator
NSK Monocarrier MCM/MCH rodless screw actuator
Single-axis actuators combining an NSK ball screw, linear guide and integral base rail in one pre-assembled unit; MCM is the lightweight version and MCH the rigid rail that can run without base support along the full stroke.
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Key specifications
| Screw type | Ball screw |
|---|---|
| Options | Sensor sets, top or full covers, motor adaptors, K1 lubrication unit |
| Finish | Low-temperature chrome plating |
Summarised in our own words from NSK Ltd.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
No stroke, lead, speed or load figures on the European data sheet page.
Specify Motion is not affiliated with NSK Ltd.. NSK and Monocarrier MCM/MCH are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
NSK Monocarrier MCM/MCH replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original NSK part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Compact C7 ballscrew linear module with built-in guide, matched to 100-400 W servo motors from the main Japanese and Taiwanese brands.
Ballscrew-driven linear module with built-in guide rail, supplied with or without an AC servo motor, for industrial positioning and multi-axis XY/XYZ systems.
Fully enclosed, dust-resistant version of the LE ballscrew module for cleanroom and contamination-sensitive work.
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Typical applications
What a rodless screw actuator is
A rodless screw actuator moves a carriage along the actuator body using a ball or lead screw inside a profile. The load mounts directly on the carriage, which runs on guides, either internal bearings or profile rails, so the actuator carries and guides the load as well as moving it. A sealing band typically closes the slot along the body. The motor mounts at one end, inline or folded, and stroke is set by the body length.
When engineers choose a rodless screw actuator
Choose a rodless screw actuator when the load needs carrying along a guided path with good positioning accuracy and stiffness, such as in pick-and-place, gantries and positioning axes. Screw drive gives high thrust and precision. The trade-offs are speed and length: long screws hit critical speed limits, so long strokes run slower. For long, fast strokes with lighter loads, a belt-driven rodless actuator is usually better.
How to specify the NSK Monocarrier MCM/MCH
Send these with your enquiry and an engineer can confirm the right Monocarrier MCM/MCH variant or an equivalent:
- Payload mass and position offset (kg, mm)
- Moment loads on the carriage (Nm)
- Stroke (mm), speed (mm/s) and acceleration (m/s²)
- Thrust force needed (N)
- Repeatability (mm)
- Orientation: horizontal, vertical or wall-mounted
- Environment and sealing (IP code)
Common mistakes to avoid
- Ignoring moment loads from offset payloads
- Choosing a long stroke at high speed and exceeding screw critical speed
- Not adding a brake for vertical axes
- Assuming the sealing band keeps out fine dust or liquids
NSK Monocarrier MCM/MCH: frequently asked questions
Can you help replace NSK Monocarrier MCM/MCH or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including Motion Control Products options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the NSK Monocarrier MCM/MCH?
Single-axis actuators combining an NSK ball screw, linear guide and integral base rail in one pre-assembled unit; MCM is the lightweight version and MCH the rigid rail that can run without base support along the full stroke. It is made by NSK Ltd.; Specify Motion can help source it or propose an equivalent.
Who makes the NSK Monocarrier MCM/MCH?
The NSK Monocarrier MCM/MCH is made by NSK (NSK Ltd.) and is listed here for engineers comparing options. Specify Motion is not affiliated with NSK Ltd.; brand names are used only to identify the product.
Is there an alternative to the NSK Monocarrier MCM/MCH?
We can assess suitable replacement options. On published figures, Motion Control Products BLM Built-in Linear Module and Motion Control Products LE Ballscrew Linear Actuator (semi-sealed) are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
Is a belt or screw rodless actuator better?
A screw rodless actuator gives more thrust, stiffness and positioning accuracy, which suits pressing, vertical axes and precise positioning. A belt actuator is faster and handles longer strokes, which suits transfer and pick-and-place over distance. Many machines use both: belts for long horizontal moves and screws for shorter, precise or vertical axes.
What limits the speed of a screw-driven actuator?
Speed is limited by the screw's critical speed, the rotation at which it starts to whip. Critical speed falls sharply as unsupported length increases, so long strokes have lower maximum speeds. Screw supports, larger diameters or a coarser lead raise usable speed. Manufacturers publish speed against stroke curves that should be checked.
Further reading: Rodless belt vs screw actuators · How to size a linear actuator · Linear actuators
Other rodless screw actuator series
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Tell us how you use the NSK Monocarrier MCM/MCH: the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
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