Airtac MARF Stainless Steel Mini Air Cylinder MARF20X45S
The AirTAC Airtac MARF Stainless Steel Mini Air Cylinder MARF20X45S is a genuine double acting + cushion (front mount) standard round-body mini air cylinder with a Ø20mm bore and 45mm 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
- Stroke45 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 MARF20X45S
A front-flange round mini cylinder from AirTAC's MA family, the MARF20X45S is double acting with a variable cushion at both ends. At 0.5 MPa the 20 mm bore pushes 157 N and pulls 131.9 N; push it to 0.7 MPa (within the 0.15-1.0 MPa (22-145 psi) range) and thrust climbs to 219.8 N. The stainless barrel with a hard-chrome plated rod shrugs off mild corrosion and washdown far better than painted-steel minis, while the riveted aluminium covers keep the round body sealed.
Working the numbers: at 0.5 MPa you can plan on roughly 94 N of real work rather than the full 157 N rating, and the raw thrust equals about 16 kg of vertical lift - halve that to 8 kg if you want a 2:1 margin on part weight. The variable air cushion lets you soften both stroke ends so faster cycling or heavier loads will not hammer the covers, and the standard built-in magnet means CMSG / DMSG / EMSG switches clip on with no special piston.
Airtac MARF Stainless Steel Mini Air Cylinder MARF20X45S Technical Specifications
| Model | Airtac MARF Stainless Steel Mini Air Cylinder MARF20X45S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 45 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 MARF20X45S
| 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. |
| ×45 | 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 MARF20X45S Is Used
Bottle reject gate
A 157 N push at 0.5 MPa is enough to kick off-spec bottles off a small beverage filler lane, and the stainless barrel tolerates daily rinse-down.
Carton tab kicker
On a compact carton sealer, the 45 mm stroke flips protruding tabs out of the fold path; the end cushions stop the arm slapping at speed.
PCB fixture ejector
The 45 mm travel lifts test PCBs clear of pogo-pin nests, with a magnet-ready body for end-of-stroke confirmation via CMSG switches.
Is the Airtac MARF Stainless Steel Mini Air Cylinder MARF20X45S the Right Cylinder?
The 20 mm bore is already the smallest MAR bore AirTAC makes, so if 157 N at 0.5 MPa falls short step up to the 25 mm bore (245.3 N at 0.5 MPa) or the 32 mm bore (402.2 N at 0.5 MPa). If the air drops, a plain MAR drifts - the cushion only softens the stroke ends - so add a rod lock where a parked position must persist. The F code means the front flange bracket is part of the cylinder itself; no separate foot or flange accessory is needed, and I or Y rod knuckles still fit the M8x1.25 rod thread. Speed range is 30-800 mm/s, and the magnet is standard for CMSG / DMSG / EMSG sensing.
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 MARF20X45S FAQ
Bore 20 mm, 45 mm stroke, double acting. At 0.5 MPa: push 157.0 N, pull 131.9 N. At 0.7 MPa: push 219.8 N (pull 184.7 N). Theoretical maximum force at 1.0 MPa is 32.0 kgf. Rod is 8 mm with an M8x1.25 male thread, air port is 1/8", operating pressure 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa = 215 psi, speed 30-800 mm/s, temperature -20 to +70 C. These 45 mm strokes are standard; longer ones are made to order.
The high-precision stainless barrel plus a hard-chrome plated carbon-steel rod resist the condensation, splash and light washdown that ruin painted or bare-aluminium minis. Add the standard magnet for CMSG / DMSG / EMSG switches and the two-way grease-retaining piston seal, and the cylinder keeps sealing cleanly through damp, food-adjacent or outdoor duty.
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