Airtac MARF Stainless Steel Mini Air Cylinder MARF20X135S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X135S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 135mm 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
- Stroke135 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 MARF20X135S
This 135 mm stroke version of the 20 mm MAR keeps the compact round body but stretches the reach, with a front-flange bracket rolled into the front cover so no loose mounting hardware is required. Double acting with variable end cushions, it delivers 157.0 N forward and 131.9 N back at 0.5 MPa, and 219.8 N forward at 0.7 MPa.
A realistic budget for continuous work is around 94 N of push at 0.5 MPa, enough to lift about 8 kg vertically with margin to spare. Where the extra 135 mm of travel matters, keep the 8 mm rod free of side load and let the cushions absorb the stop at each end. The standard piston magnet drops CMSG, DMSG or EMSG switches straight onto the tube.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X135S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X135S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 135 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 MARF20X135S
| 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. |
| ×135 | 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 MARF20X135S Is Used
Lid lift on a benchtop curing oven
Raises the hinged lid of a small curing oven; the front flange anchors to the frame top and 157 N swings the insulated lid through its 135 mm arc.
Reject gate on a tablet counting line
Swings a divert gate on a tablet counting line; the cushion eases the gate into its stop so the counting sensors are not jolted by the impact.
Feed finger on a cable stripping bench
Feeds cable into a stripping head between cycles; 131.9 N of return pull withdraws the feed finger cleanly for the next length of wire.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X135S the Right Cylinder?
There is no smaller MAR bore to step down to - 20 mm is the floor of the range. Step up to 25 mm for 245.3 N at 0.5 MPa or 40 mm for 628.3 N if the load grows. Do not expect position holding on air loss; a separate rod lock is the answer for held loads. Ports are 1/8 inch on this bore and the rod thread is M8x1.25 for attaching I or Y knuckle accessories.
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 MARF20X135S FAQ
Extension force 157.0 N and retraction 131.9 N at 0.5 MPa; at 0.7 MPa it makes 219.8 N and 184.7 N. Maximum theoretical force is 32.0 kgf at 1.0 MPa. It runs on 0.15-1.0 MPa (22-145 psi) air, survives 1.5 MPa (215 psi) proof, and strokes at 30-800 mm/s.
Needle screws at each end let you throttle the exhaust air so the final millimetres of travel decelerate gently. On a 135 mm stroke running at speed, the covers and any mounted tooling take far less shock, so you can raise cycle rate without hammering the ends. Set them on first run, then leave them alone.
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