Airtac MARU Stainless Steel Mini Cylinder MARU20X400S
The AirTAC Airtac MARU Stainless Steel Mini Cylinder MARU20X400S is a genuine double acting + cushion (up mount) standard round-body mini air cylinder with a Ø20mm bore and 400mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service. A variable air cushion at both ends lets you tune end-of-stroke deceleration on site.
- BoreØ20 mm
- Stroke400 mm
- Port size1/8"
- Acting typeDouble acting + cushion (up mount)
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MARU Stainless Steel Mini Cylinder MARU20X400S
Long travel in a sealed, riveted package: the MARU20X400S is a double-acting AirTAC MAR mini cylinder with a 400 mm stroke, variable air cushion at both ends and its own U-type (up/top) front bracket built into the covers. At 0.5 MPa the 20 mm bore pushes 157 N and pulls 131.9 N, enough to eject, divert or lift light parts across a long span.
The stainless-steel barrel shrugs off the damp and washdown that eat painted minis, and the hard-chrome plated 8 mm rod keeps sliding friction low over the long stroke. Because 157 N is the theoretical figure, plan real work at about 94 N (roughly 60 percent of rating) at 0.5 MPa - or read it as about 8 kg of vertical lift once you keep a 2:1 margin. Air range is 0.15-1.0 MPa (22-145 psi) and speed 30-800 mm/s.
Airtac MARU Stainless Steel Mini Cylinder MARU20X400S Technical Specifications
| Model | Airtac MARU Stainless Steel Mini Cylinder MARU20X400S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Acting type | Double acting + cushion (up mount) |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Variable air cushion, both ends |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MA-series datasheet. Barrel: stainless-steel tube (round-body, riveted rolling-packed construction); piston rod: carbon steel with 20µm hard-chrome plating; covers: aluminium alloy. Thread options: PT (blank) / G / NPT. Every MA-series cylinder ships with a built-in magnet for CMSG / DMSG / EMSG position sensors.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MARU Stainless Steel Mini Cylinder MARU20X400S
| MAR | Standard round-body mini cylinder (double-acting, integrated mount, variable cushion). |
|---|---|
| U | Front-cover mount: U = up (top) mounting. |
| 20 | Bore size in mm. |
| ×400 | Stroke length in mm. |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
MA-family variants: MA / MAC (double acting ±cushion), MSA / MTA (single acting push / pull), MAD / MACD (double rod ±cushion), MAJ / MACJ (adjustable stroke ±cushion), MAR (cushioned with integrated F/U mount). Mounting accessories: FA flange, LB foot, SDB pivot; plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MARU Stainless Steel Mini Cylinder MARU20X400S Is Used
Carton divert gate on a sorter
The 400 mm throw swings a diverter arm across a wide belt lane, with 157 N at 0.5 MPa plenty for empty cartons and the cushion softening each swing at 400 mm/s.
Tray ejector on a bakery rack loader
A long push clears full trays off a chain conveyor into a stacking magazine, and the stainless barrel copes with the flour-dusted, damp air near the ovens.
Depth-stop on a timber cut-off saw
CMSG switches on the standard magnet confirm the 400 mm feed position before the saw drops, while the integral top bracket bolts the body straight to the fence.
Is the Airtac MARU Stainless Steel Mini Cylinder MARU20X400S the Right Cylinder?
At 400 mm this is a long-stroke build on the 8 mm rod, so keep side loads off the rod: guide the load in its own linear bearings and connect through a floating joint or an I / Y knuckle on the M8x1.25 male thread. If 157 N of push at 0.5 MPa feels thin, step up to the 25 mm bore (245.3 N push, 206.1 N pull) or the 32 mm bore (402.2 N push) in the same MAR format; there is no bore below 20 in this series. Note that a plain MAR holds nothing when air is lost - the rod drifts freely, so a rod lock is the fix where a suspended load must stay put.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) is standard for sensors
- ✓ Back cover (CA/U/CM) & mount (FA/LB/SDB)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check On first run, back off the cushion screws and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MARU Stainless Steel Mini Cylinder MARU20X400S FAQ
At 0.5 MPa the 20 mm bore pushes 157 N and pulls 131.9 N. At 0.7 MPa those rise to 219.8 N push and 184.7 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. The rod is 8 mm with an M8x1.25 male thread and the ports are 1/8".
Turn the cushion needle screws at both covers on first run and adjust until the impact disappears; the variable air cushion works across the whole 30-800 mm/s speed range, so faster cycles just need a touch more restriction.
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