Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X50S
Genuine AirTAC magnetic rodless cylinder, order code RMH20X50S from the RMH range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- BoreØ20 mm
- Stroke50 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 RMH20X50S
With a Dia 20 mm bore and just 50 mm of travel, the RMH20X50S is the compact entry of the Dia 20 RMH range, giving you the full 220 N magnetic holding force in the shortest envelope the series offers. Because the piston is magnetically coupled, the tube stays sealed with no rod to support, and the built-in guide rail takes side loads and anti-rotation duties for the slide.
Short strokes also land in the tighter tolerance band: +1.0/0 mm applies to strokes up to 250 mm, so positioning at the slide face is more predictable than on the longer Dia 20 codes. Fixed cushions on adjusting screws at both ends soften the 50 mm move, PT1/8 ports sit on one side, and the 0.2-0.7 MPa supply must be air filtered to 40 um.
Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X50S Technical Specifications
| Order code | RMH20X50S |
|---|---|
| Product | Magnetic Rodless Cylinder |
| Bore | Ø20 mm |
| Stroke | 50 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
Within the Dia 20 family, RMH20X50S wins when space or cycle speed matters more than reach; RMH20X100S doubles the travel if 50 mm proves tight. For a 50 mm stroke with heavier loads, compare RMH16X50S (140 N, 3/5 kg) and RMH25X50S (345 N, 4.8/8 kg) before settling on 220 N. This code uses PT threads; RMH20X50SG (G) and RMH20X50ST (NPT) are the catalog alternatives for Dia 20.
Applications
Short-stroke clamping on a machining fixture
A 50 mm guided clamp throw with 220 N holding force, softened at both ends by the fixed cushions on adjusting screws.
Part ejection under a press or feeder
Kicks small parts clear in a 50 mm move at up to 400 mm/s, with a DMSH sensor in the groove confirming the retract position.
Fine positioning of a stop or gate
The +1.0/0 mm stroke tolerance for strokes up to 250 mm makes repeatable 50 mm positioning predictable on sorting chutes and gates.
FAQ
What are the key figures of the AirTAC RMH20X50S?
Dia 20 mm bore, 50 mm stroke, PT1/8 ports, magnetic coupling with 220 N holding force, operating pressure 0.2-0.7 MPa, speed 50-400 mm/s, temperature -20 to +70 C, stroke tolerance +1.0/0 mm for strokes up to 250 mm, fixed cushions with adjusting screws at both ends.
Why pick a 50 mm stroke instead of a longer Dia 20 RMH?
The 50 mm code gives the same 220 N holding force and guided slide in the shortest body of the Dia 20 range, keeps the tighter +1.0/0 mm tolerance band, and fits stations where a longer rodless body simply has no room. If the throw later grows, the same-bore RMH20X100S or longer strokes to 800 mm keep your port and sensor setup unchanged in concept.