Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S is a genuine double acting + cushion (front 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 (front mount)
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S
Long reach, small package: the MARF20X400S spans 400 mm of stroke from a 20 mm stainless round barrel, delivering 157 N push and 132 N pull at 0.5 MPa in double-acting mode. The front flange is part of the front cover itself, so one set of screws fixes the whole cylinder to the machine frame without ordering a separate mounting accessory.
Adjustable cushion screws at each end let you tame the rod's arrival over a 400 mm run, keeping speeds anywhere in the 30-800 mm/s band usable even with a payload aboard. On a 0.15-1.0 MPa (22-145 psi) supply the bore can theoretically lift about 16 kg, or around 8 kg if you halve the figure for a 2:1 margin. The riveted covers and grease-retaining two-way piston seals stay sealed through the full travel.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Acting type | Double acting + cushion (front 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 MARF Stainless Steel Mini Air Cylinder MARF20X400S
| MAR | Standard round-body mini cylinder (double-acting, integrated mount, variable cushion). |
|---|---|
| F | Front-cover mount: F = front-flange 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 MARF Stainless Steel Mini Air Cylinder MARF20X400S Is Used
Carton pusher at a conveyor junction
400 mm of reach moves a small parcel fully off one lane and onto the diverter, with 157 N covering light carton loads at pace.
Nozzle carriage lift in a spray booth
Raises a spray head of about 8 kg over a 400 mm rise with margin; the stainless barrel copes with mist and rinse-down.
Slide door drive on a parts-washer enclosure
Opens and closes a sliding guard across a long opening; adjustable cushioning keeps the panel from battering the frame.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X400S the Right Cylinder?
Compare 157 N of push at 0.5 MPa here against 402 N from a 32 mm bore or 628 N from 40 mm before committing - long strokes multiply friction, so if the payload rides on external guides the 20 mm size often still wins. Retraction pulls 132 N at 0.5 MPa; if your return stroke is loaded, check that figure first. With air off the rod simply drifts, so spec a rod lock where holds matter. Over 400 mm, keep side loads off the 8 mm rod - guide the load externally and align the flange square to the track. The 1/8 inch port and M8x1.25 rod thread match across bores 20 to 40.
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 MARF Stainless Steel Mini Air Cylinder MARF20X400S FAQ
Push is 157 N and pull 132 N at 0.5 MPa; at 0.7 MPa expect 220 N and 185 N. The 20 mm bore tops out at a theoretical 32 kgf at 1.0 MPa. The 8 mm rod carries an M8x1.25 thread and the air port is 1/8 inch.
The stainless-steel tube and hard-chrome plated rod resist rust and mild washdown far better than painted-steel minis, which is why this length is common near wash stations and outdoors. Feed the 1/8 inch port with air filtered to 40 micron and the rolled, riveted covers stay sealed over the whole travel.
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