Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting + cushion (front mount)
- Rod threadM12×1.25
- CushionVariable air cushion, both ends
About the Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S
Long-travel jobs in tight spaces are where the MARF40X250S earns its place: 250 mm of stroke on a 40 mm stainless barrel with the flange built into the front cover. Rated at 628.3 N push and 527.8 N pull at 0.5 MPa, it runs on 0.15-1.0 MPa (22-145 psi) supply pressure.
The cushion needles at both ends matter more as stroke grows, because rod speed builds over 250 mm; adjust them until the stop is quiet. Plan on roughly 377 N for real work at 0.5 MPa, which is about 32 kg of vertical lifting at a 2:1 margin. The riveted round body stays sealed in damp surroundings, and the standard-fit magnet accepts CMSG / DMSG / EMSG switches along the full tube length.
Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting + cushion (front mount) |
| Port size | 1/8" |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MARF40X250S
| MAR | Standard round-body mini cylinder (double-acting, integrated mount, variable cushion). |
|---|---|
| F | Front-cover mount: F = front-flange mounting. |
| 40 | 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 MARF40X250S Is Used
Bridge conveyor extension
Extending a bridge or nose section between two conveyors; the 250 mm stroke closes the gap and the flange mounts the cylinder inside the bridge frame.
Order picking diverters
Diverting totes at a picking lane junction, where 628 N of push swings or slides the diverter and sensors on the magnet confirm diverter position.
Assembly line index pushers
Advancing pallets or fixtures one station on a dial or linear assembly line, with cushion needles tuned so the 250 mm move ends without a thud.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF40X250S the Right Cylinder?
Compare the 32 mm MARF at 402.2 N push if your duty is lighter, or the 50 mm bore at 981.3 N when the load is heavier. A 250 mm rod needs external guidance for anything beyond pure axial thrust - side loads at this length bend rods and score seals fast. If supply fails mid-stroke the rod settles wherever the load takes it; the cushion only softens the ends, it is not a brake, so specify a rod lock cylinder when position must persist. Speeds of 30-800 mm/s are within range and ports are 1/8 inch.
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 MARF40X250S FAQ
This 40 mm bore delivers 628.3 N on extension and 527.8 N on retraction at 0.5 MPa. At 0.7 MPa the outputs are 879.6 N and 738.9 N respectively, and the theoretical maximum is 128.1 kgf at 1.0 MPa.
Yes - the magnet is built in as standard on every MA-series cylinder, so CMSG, DMSG or EMSG switches drop onto the stainless tube at any point along the 250 mm travel. No special-order piston or retrofitted band is required, and switching works across the full 30-800 mm/s speed range.
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