Airtac MARF Stainless Steel Mini Air Cylinder MARF20X40S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X40S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 MARF20X40S
Few minis shrug off washdown like the MARF20X40S: a 20 mm stainless round barrel with a hard-chrome steel rod, riveted aluminium covers, and a front flange formed into the body. At 0.5 MPa it develops 157 N pushing and 132 N pulling - handy for 40 mm moves on filling, packaging and test rigs running 0.15-1.0 MPa (22-145 psi) air.
Both ends carry an adjustable air cushion, so 40 mm strokes can be cycled fast without the covers taking a beating. Because the piston magnet is fitted as standard, CMSG, DMSG and EMSG switches mount anywhere on the barrel with no special-order piston. For sizing, treat about 94 N as the practical working force rather than the headline 157 N.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X40S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X40S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 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 MARF20X40S
| 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. |
| ×40 | 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 MARF20X40S Is Used
Probe actuator on a leak-test fixture
A 40 mm advance seats the test probe; 157 N at 0.5 MPa holds the seal face steady while the gauge cycles.
Bottle kicker on a filling line
Flicks mis-filled PET bottles into the reject chute; cushioned ends stop the arm chattering during 800 mm/s cycling.
Index pin on a rotary indexing table
Locks each station with a 40 mm insert-retract move; the standard piston magnet feeds a position signal to the PLC.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X40S the Right Cylinder?
This 40 mm stroke sits between the compact 35 mm and the long 400 mm versions of the same bore; all three share 157 N push, 132 N pull at 0.5 MPa and a 1/8 inch port. If the job is vertical, remember the MAR will not hold position on air loss - the cushion only softens the stroke ends, so add a rod lock where a part must stay lifted. Mounting needs no accessory: the flange is the front cover itself, while I and Y knuckles fit the M8x1.25 rod end. If 94 N of working force is marginal, the 25 mm bore offers 245 N at the same pressure.
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 MARF20X40S FAQ
Expect 157 N push and 132 N pull at 0.5 MPa, rising to 220 N push and 185 N pull at 0.7 MPa, with a 32 kgf theoretical peak at 1.0 MPa. Connections are a 1/8 inch air port, an 8 mm rod and an M8x1.25 rod thread.
Yes. Needle screws at each end cover let you meter the exhaust and soften the last part of the 40 mm stroke, so faster cycles or heavier gripper mass arrive quietly instead of hammering the covers. Turn the screws in for more braking, out for snappier cycling, and re-check after the first hour of running. Speed range is 30-800 mm/s.
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