Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X400S
Genuine AirTAC magnetic rodless cylinder, order code RMH20X400S from the RMH range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- BoreØ20 mm
- Stroke400 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 RMH20X400S
The RMH20X400S is the 400 mm travel version of the AirTAC Dia 20 magnetic rodless cylinder with built-in guide rail. Because the slide is driven through magnets with no rod, a long stroke still needs only the cylinder body width, and the sealed piston tube keeps the slide area clean over its life.
A 400 mm stroke falls in the 251-800 mm band, so the catalog stroke tolerance is +1.5/0 mm rather than the +1.0/0 mm that applies at or below 250 mm. The Dia 20 coupling holds 220 N and the loading table allows 3.6/6 kg up to 500 mm stroke, so this code runs a long transfer while staying in the full-load range. PT1/8 ports, a built-in sensor groove for CMSH, DMSH or EMSH switches, and adjusting-screw cushions at both ends complete the package; hydraulic shock absorbers can be ordered separately to replace the fixed cushions.
Airtac RMH Magnetic Coupling Rodless Cylinder RMH20X400S Technical Specifications
| Order code | RMH20X400S |
|---|---|
| Product | Magnetic Rodless Cylinder |
| Bore | Ø20 mm |
| Stroke | 400 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
Compare RMH20X400S directly with RMH20X350S and RMH20X500S in the same Dia 20, PT-thread row: 400 mm gives 50 mm more reach than the 350 code while remaining under the 500 mm stroke where the 3.6/6 kg load case ends. If you must hold the tighter +1.0/0 mm stroke tolerance of the short band, pick a code of 250 mm or less such as RMH20X250S. When the load exceeds the Dia 20 case, RMH25X400S offers 345 N holding force and a 4.8/8 kg load rating. On Dia 20 and Dia 25, thread code G gives G and T gives NPT; blank, as here, gives PT1/8.
Applications
Tote transfer between shelves
Slide totes across a 400 mm gap in storage or picking equipment, with the guide rail handling moment loads and the 220 N coupling carrying the thrust.
Sliding machine guard drive
Open and close an enclosure panel over 400 mm at 50 to 400 mm/s, end positions confirmed by a DMSH or EMSH sensor clipped into the built-in groove.
Long-reach pusher on pallet stations
Position or square up palletised loads with a 400 mm push stroke, using adjusting-screw cushions or optional hydraulic shock absorbers to settle the slide gently.
FAQ
What specifications define the RMH20X400S?
Dia 20 mm bore, 400 mm stroke, double-acting magnetic coupling rated 220 N holding force, PT1/8 ports on one side, 0.2-0.7 MPa operating pressure, 50-400 mm/s speed, -20 to +70 C, stroke tolerance +1.5/0 mm for the 251-800 mm band, catalog load 3.6/6 kg up to 500 mm stroke, fixed cushions on adjusting screws, sensors CMSH, DMSH, EMSH.
Why pick 400 mm over shorter Dia 20 strokes?
It extends reach while remaining in the full-load band: the 3.6/6 kg loading case applies up to 500 mm stroke, and strokes beyond 250 mm simply move to the wider +1.5/0 mm tolerance. The rodless layout keeps the installed length close to the stroke itself, unlike a rod cylinder that needs extra room for the exposed rod.