Airtac MARF Stainless Steel Mini Air Cylinder MARF20X25S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X25S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 25mm 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
- Stroke25 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 MARF20X25S
Short, snappy and self-mounting, the MARF20X25S throws 25 mm from a 20 mm bore while its front flange comes built into the cover. It is double acting with a variable cushion at both ends, pushing 157 N and pulling 131.9 N at 0.5 MPa - 219.8 N if you feed it 0.7 MPa. A 1/8 in port supplies the bore and the 8 mm rod carries an M8x1.25 thread.
For sizing, treat 157 N as the rating and plan on roughly 94 N of useful push - about six tenths - so a clamped part still has headroom at speed. The stainless barrel with its hard-chrome rod laughs at splash and humidity, an honest edge over painted minis in food or outdoor panels. The magnet is standard, feeding CMSG, DMSG and EMSG switches out of the box. Operating window: 0.15-1.0 MPa (22-145 psi), -20 to +70 C, 30-800 mm/s.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X25S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X25S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 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 MARF20X25S
| 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. |
| ×25 | 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 MARF20X25S Is Used
Bracket clamp
Clamps a small ABS bracket against a hard stop during a 3 second screwdriving cycle on an assembly bench.
Chute diverter
Flips a diverter flap every few seconds to sort 50 g connectors between two output bins.
Pin press
Presses dowel pins 20 mm into plastic housings on a bench fixture, relying on the cushion to land softly.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X25S the Right Cylinder?
Nothing sits below bore 20 in this series, so compare upward: bore 25 pushes 245 N and bore 32 manages 402 N at 0.5 MPa if your clamp needs more than 157 N. For a 25 mm throw this cylinder excels at quick eject-and-return moves at up to 800 mm/s. If the load must stay gripped through an air failure, the MAR will not hold it by itself - a separate rod lock is the answer. The integrated front flange means no separate FA plate to order, and the built-in magnet already suits CMSG, DMSG and EMSG switches.
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 MARF20X25S FAQ
Output at 0.5 MPa is 157 N on extend and 131.9 N on retract. At 0.7 MPa you get 219.8 N push and 184.7 N pull, and the theoretical maximum is 32.0 kgf at 1.0 MPa. Operating pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s.
Both stroke ends have a variable air cushion. On first run-up, turn the needle screws until the 25 mm landing is smooth at your working speed - anything from 30 to 800 mm/s. That lets you run faster or carry a heavier clamp load without hammering the covers. The cushion softens arrival only; it does not lock the piston.
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