Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X300S
Genuine AirTAC magnetic rodless cylinder, order code RMH20X300S from the RMH range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- BoreØ20 mm
- Stroke300 mm
- Port threadPT1/8
- ActionDouble acting, magnetic coupling
- GuideBuilt-in guide rail
- Ø10holding force 55 N · strokes to 300 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X300S
With RMH20X300S the Dia 20 RMH cylinder moves into longer-stroke territory: 300 mm of travel falls in the 251-800 mm band, so the catalog applies the +1.5 / 0 mm stroke tolerance instead of the +1.0 / 0 mm used up to 250 mm. The slide is still driven purely by magnetic coupling inside a sealed tube, with the built-in guide rail carrying the running accuracy and load capacity along the full length.
The 300 mm stroke stays comfortably inside the 500 mm window over which the catalog allows 3.6 / 6 kg loads at this bore, with 220 N of magnetic holding force as the ceiling for load force. It runs on 40 um-filtered air at 0.2-0.7 MPa from -20 to +70 C, with PT1/8 ports on one side of the body.
Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X300S Technical Specifications
| Order code | RMH20X300S |
|---|---|
| Product | Magnetic Rodless Cylinder |
| Bore | Ø20 mm |
| Stroke | 300 mm |
| Port thread | PT1/8 |
| Action | Double acting, magnetic coupling |
|---|---|
| Guide | Built-in guide rail |
| Ø10 | holding force 55 N · strokes to 300 mm |
| Ø16 | holding force 140 N · strokes to 500 mm |
| Ø20 | holding force 220 N · strokes to 800 mm |
| Ø25 | holding force 345 N · strokes to 800 mm |
| Fluid | Air (filtered by 40 µm element) |
| Operating pressure | 0.2-0.7 MPa |
| Proof pressure | 1.2 MPa (175 psi) |
| Temperature | -20 to +70 °C |
| Speed | 50-400 mm/s |
| Stroke tolerance | +1.0 / 0 mm (≤250), +1.5 / 0 mm (251-800) |
| Cushion | Fixed, adjusting screws |
| Sensors | CMSH, DMSH, EMSH |
| Port | M5×0.8 (Ø10, 16), PT1/8 (Ø20, 25) |
Source: AirTAC Products Catalog 2026A (PDF01-P0612..P0613), RMH series specifications, load tables, strokes and ordering code.
How to choose
Compared with RMH20X250S, this code trades the tighter +1.0 / 0 mm stroke tolerance for 50 mm more reach, and compared with the longest Dia 20 build, RMH20X800S, it stays near the top of the load curve where the allowed load has not yet fallen off. On bore, RMH16X300S reaches 300 mm with 140 N holding force and 3 / 5 kg loads, while RMH25X300S raises the coupling to 345 N and loads to 4.8 / 8 kg; take this Dia 20 code when 220 N and 3.6 / 6 kg are enough. RMH20X300SG and RMH20X300ST cover G and NPT threads if PT1/8 does not match the plant standard.
Applications
Parts feeding track
Push parts down a feeding track over 300 mm of travel, sizing the push force under the 220 N holding force so the magnetic coupling holds through every cycle.
Long-reach clamp positioner
Use the extended 300 mm slide to open and close fixtures or gates where a rod cylinder of equal reach would need extra installed length.
Process inspection slide
Move samples or sensor heads across a 300 mm inspection span; the guide rail keeps lateral play low, and EMSH, CMSH or DMSH switches report slide position in the groove.
FAQ
What are the key figures of the RMH20X300S?
Dia 20 mm bore, 300 mm stroke, magnetic holding force 220 N, allowed load 3.6 / 6 kg on strokes up to 500 mm, PT1/8 ports, 0.2-0.7 MPa, 50-400 mm/s, -20 to +70 C, stroke tolerance +1.5 / 0 mm.
Does the 300 mm stroke change the load rating compared with shorter Dia 20 cylinders?
The 3.6 / 6 kg load rating applies on strokes up to 500 mm, so a 300 mm stroke is still inside it, while longer builds toward RMH20X800S see the allowed load fall. Always keep the load force below the 220 N magnetic holding force as well.