Airtac MARF Stainless Steel Mini Air Cylinder MARF20X250S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X250S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 250mm 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
- Stroke250 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 MARF20X250S
AirTAC's MARF20X250S pairs a long 250 mm stroke with a 20 mm bore in a riveted stainless round body, and the front flange is already part of the head - no bolt-on bracket to source. Double acting with a variable cushion at each end, it pushes 157 N and pulls 131.9 N at 0.5 MPa, stepping up to 219.8 N at 0.7 MPa. The 8 mm rod is hard-chrome plated carbon steel with an M8x1.25 thread and a 1/8 in port.
Moist, dusty or lightly washed-down stations are where this build pays off: stainless tube and chrome rod resist the corrosion that ruins painted mini cylinders. The cushion needles let you tune the landing so a 250 mm move can finish fast without a bang. Vertically, the rod lifts about 16 kg at 0.5 MPa on paper - halve that to roughly 8 kg for a comfortable 2:1 margin when sizing a real payload. Supply air at 0.15-1.0 MPa (22-145 psi) and run 30-800 mm/s.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X250S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X250S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 250 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 MARF20X250S
| 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. |
| ×250 | 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 MARF20X250S Is Used
Sliding guard door
Opens and closes a 250 mm polycarbonate guard on a small press bench, with the magnet confirming the door is fully home.
Tote nudger
Nudges totes off a gravity roller spur into a pick lane at up to 800 mm/s without knocking the lane out of line.
Fixture eject pin
Drives a long eject pin that lifts thin brass shims clear of a stamping die after each hit.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X250S the Right Cylinder?
Step up from bore 20 only when you must: 245 N (bore 25) and 402 N (bore 32) at 0.5 MPa cover heavier jobs, but for this 250 mm travel the 157 N push usually suffices for light payloads. If the machine must hold position through a power cut, remember the piston drifts on air loss - fit a rod lock rather than relying on the cushion. Mounting needs no extra bracketry because the front flange is built into the head; I or Y rod knuckles still thread onto the M8x1.25 rod. Long travel plus a slim rod means side loads should be carried by external guides.
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 MARF20X250S FAQ
Rated output at 0.5 MPa is 157 N extending and 131.9 N retracting. Supply 0.7 MPa and the push climbs to 219.8 N with 184.7 N on the return. At the 1.0 MPa maximum the theoretical force is 32.0 kgf. It runs on filtered air at 0.15-1.0 MPa (22-145 psi), 30-800 mm/s.
No. Every MARF20X250S ships with the magnet built in, so CMSG, DMSG or EMSG switches drop straight onto the barrel to signal extend and retract. No special-order piston, no waiting.
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