Airtac MARF Stainless Steel Mini Air Cylinder MARF20X125S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X125S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 125mm 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
- Stroke125 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 MARF20X125S
A 20 mm bore MAR in the 125 mm stroke length, this cylinder is double acting with a variable air cushion at each end and carries its own front-flange bracket, so the body bolts straight to a fixture without a separate flange plate. At 0.5 MPa it pushes with 157.0 N and retracts with 131.9 N; at 0.7 MPa those figures climb to 219.8 N and 184.7 N.
Working at a conservative duty level, count on roughly 94 N of usable push at 0.5 MPa, which is about 8 kg of vertical lift with a 2:1 margin left in reserve. The stainless round barrel with a hard-chrome plated rod handles damp washdown corners better than painted minis, and the built-in magnet is ready for CMSG, DMSG or EMSG switches from day one. Speed range is 30-800 mm/s over 0.15-1.0 MPa (22-145 psi).
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X125S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X125S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MARF20X125S
| 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. |
| ×125 | 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 MARF20X125S Is Used
Small-part ejection on a bench press
Kicks finished brackets off a press die; 157 N of push clears 125 mm of travel in one motion and the adjustable cushion stops the die-side bounce.
Carton flap tuck on a semi-auto cartoner
Tucks end flaps on light board boxes; the front-flange mount sits flush against the machine frame and the 94 N working push is ample for the job.
Fixture clamp on a drilling jig
Clamps aluminium housings before drilling; 131.9 N of pull releases the clamp arm and the standard magnet feeds a CMSG switch for cycle confirmation.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X125S the Right Cylinder?
At 20 mm this is the smallest bore MAR makes; if your load needs more than about 157 N, step to the 25 mm bore at 245.3 N or the 32 mm bore at 402.2 N push at 0.5 MPa. The piston drifts if air is lost, so add a rod lock where a load must be held. Note the rod is only 8 mm over this 125 mm travel, so keep side loads off the rod and guide the load externally. Ports are 1/8 inch; rod thread M8x1.25.
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 MARF20X125S FAQ
At 0.5 MPa the 20 mm bore delivers 157.0 N pushing and 131.9 N pulling; at 0.7 MPa it reaches 219.8 N push and 184.7 N pull. The theoretical ceiling is 32.0 kgf at 1.0 MPa. Air supply is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed runs 30-800 mm/s.
No. Every MA-series piston carries a magnet as standard, so CMSG, DMSG and EMSG reed or solid-state switches clip onto the stainless barrel without a special order. The front-flange bracket is also integral to the cover, so no separate mounting kit is needed.
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