Airtac MARF Stainless Steel Mini Air Cylinder MARF20X50S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X50S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 MARF20X50S
For a 50 mm working stroke at 20 mm bore, the MARF20X50S pairs double-acting power with a variable air cushion at each end. Air at 0.5 MPa produces 157 N on extend and 131.9 N on retract; at 0.7 MPa the push figure reaches 219.8 N. The round stainless barrel with its hard-chrome plated 8 mm rod takes condensation and light washdown in stride - a genuine edge over painted-steel minis in damp workshops or outdoor stations.
Put the rating to work: budget about 94 N for the actual task at 0.5 MPa instead of the full 157 N, and treat vertical capability as roughly 16 kg at the raw figure, or 8 kg with a 2:1 safety margin. Since the front flange is riveted into the cylinder body, machine builders save the bracket line item entirely. Every unit ships with the magnet already in the piston, so CMSG / DMSG / EMSG switches drop on for end-of-stroke detection from day one.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X50S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X50S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 50 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 MARF20X50S
| 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. |
| ×50 | 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 MARF20X50S Is Used
Assembly conveyor stopper
The 50 mm stroke raises a stopper pin under control boxes on a pacing conveyor, and the cushion ends keep the pin from rattling at cycle rate.
Glue head down-stroke
On a small carton sealer the 157 N extension presses a hot-melt nozzle to the flap; stainless construction shrugs off adhesive-laden wipe-downs.
Mail sorter flap diverter
A 50 mm throw flips sorting flaps between two parcel lanes, with the standard magnet and a DMSG switch confirming the diverter position.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X50S the Right Cylinder?
Because 20 mm is the smallest MAR bore, down-sizing is not an option - if 157 N at 0.5 MPa is too little, move to the 25 mm bore at 245.3 N or the 32 mm bore at 402.2 N, both at 0.5 MPa. The MAR holds nothing once air is cut; the piston simply floats, so spec a rod lock for clamps that must stay shut through a power drop. The 50 mm stroke sits comfortably inside the standard range, and the integrated F flange means one fewer accessory to buy and align. I and Y rod knuckles thread onto M8x1.25, the magnet comes standard, and operating parameters run 0.15-1.0 MPa (22-145 psi) at 30-800 mm/s.
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 MARF20X50S FAQ
Double acting, bore 20 mm, stroke 50 mm. At 0.5 MPa the cylinder pushes 157.0 N and pulls 131.9 N; at 0.7 MPa those become 219.8 N push and 184.7 N pull. Theoretical maximum force at 1.0 MPa is 32.0 kgf. The rod is 8 mm with M8x1.25 male thread, the air port is 1/8", working pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa = 215 psi, speed 30-800 mm/s, and the 50 mm stroke is standard.
No. Every MA-series cylinder, the MARF20X50S included, carries a built-in magnet as a standard feature, so CMSG, DMSG or EMSG reed/electronic switches simply clip onto the stainless barrel wherever the application needs a signal - no special-order piston, no retrofit kit. The 50 mm stroke leaves room to position switches for both end positions.
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