Airtac MARF Stainless Steel Mini Air Cylinder MARF20X120S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X120S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 120mm 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
- Stroke120 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 MARF20X120S
Reaching 120 mm from a 20 mm bore, the MARF20X120S keeps the series figures intact: 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N at 0.7 MPa, 32 kgf theoretical maximum. Inside sits a stainless-steel barrel with a hard-chrome plated rod; outside, the aluminium covers are rolled onto the tube, leaving a sealed round body that shrugs off moisture where painted minis blister.
For budgeting, count on around 94 N of dependable force at 0.5 MPa - the figure that survives seal friction and pressure dips - and match carrier weights to the roughly 8 kg vertical-lift number that a 2:1 margin gives. The magnet ships installed, so CMSG, DMSG or EMSG switches clamp on anywhere along the 120 mm travel. Pressure window 0.15-1.0 MPa (22-145 psi), temperature -20 to +70 C, speed 30-800 mm/s.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X120S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X120S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 120 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 MARF20X120S
| 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. |
| ×120 | 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 MARF20X120S Is Used
Carton flap tucker
Folds the last minor flap on a small-box erector; the 120 mm reach covers the distance from flap to tucker head.
Rotary index lock-pin
Plunges a locating pin into a dial-plate hole on a capping machine, cushioned so the pin never slams into the seat.
Small-parts diverter
Pushes cosmetic closures across a roller lane into a reject bin, monitored end to end by a CMSG switch.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X120S the Right Cylinder?
There is no MAR bore below 20 mm, so if 157 N at 0.5 MPa is marginal, move to the MARF25X120S and its 245.3 N push. The 120 mm stroke remains standard (the bore allows up to 500 mm), so no custom build is needed. Because a longer stroke gives side loads more leverage on the 8 mm rod, align the load or add external guides for cantilevered parts. On power loss the rod simply floats - cushions damp the ends, nothing locks it - so specify a rod lock for held positions. The integrated front flange and the factory magnet each remove one accessory from the order.
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 MARF20X120S FAQ
Push 157 N and pull 131.9 N at 0.5 MPa; push 219.8 N at 0.7 MPa; theoretical maximum 32 kgf for the bore. Ports are 1/8 (PT blank, G or NPT thread) and the rod thread is M8x1.25 on an 8 mm rod.
Yes - the magnet is installed at the factory as standard, so CMSG, DMSG or EMSG switches snap onto the barrel and signal the stroke ends without any special piston order.
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Covers non-human-caused product damage.
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