Airtac MARU Stainless Steel Mini Cylinder MARU20X40S
The AirTAC Airtac MARU Stainless Steel Mini Cylinder MARU20X40S is a genuine double acting + cushion (up mount) standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 mm
- Port size1/8"
- Acting typeDouble acting + cushion (up mount)
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MARU Stainless Steel Mini Cylinder MARU20X40S
Compact and quick to respond, the MARU20X40S gives you a 40 mm stroke in a 20 mm bore that pushes 157 N at 0.5 MPa (131.9 N on the return). It is double acting with a variable air cushion at each end, and the front cover carries a built-in U-type top bracket, so the cylinder bolts straight to the machine with no separate foot or flange.
Every MAR ships with the piston magnet as standard, so CMSG, DMSG or EMSG switches clip on for end-of-stroke signalling without any special order. Working the numbers: treat about 94 N as the practical 0.5 MPa workload, which is also roughly 8 kg of vertical lift at a 2:1 margin. The riveted stainless barrel plus hard-chrome carbon-steel rod tolerates splashes and outdoor dust far better than painted mini bodies.
Airtac MARU Stainless Steel Mini Cylinder MARU20X40S Technical Specifications
| Model | Airtac MARU Stainless Steel Mini Cylinder MARU20X40S |
|---|---|
| Series | MAR mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Double acting + cushion (up 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 MARU Stainless Steel Mini Cylinder MARU20X40S
| MAR | Standard round-body mini cylinder (double-acting, integrated mount, variable cushion). |
|---|---|
| U | Front-cover mount: U = up (top) mounting. |
| 20 | Bore size in mm. |
| ×40 | 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 MARU Stainless Steel Mini Cylinder MARU20X40S Is Used
Kicker pin on a small injection mold
40 mm is a classic kicker throw for popping a part off the B-side, and 157 N at 0.5 MPa beats light friction without marking the part.
Sample pusher on a lab autosampler
The short stroke slots a vial rack onto the sampling position, and the stainless barrel survives the reagent spills that ruin painted minis.
Hold-down clamp on a PCB test fixture
Top-mount the body through the integral U bracket and clamp boards with about 94 N of practical 0.5 MPa force, cushioned so the probe deck is never hammered.
Is the Airtac MARU Stainless Steel Mini Cylinder MARU20X40S the Right Cylinder?
A 40 mm stroke keeps this cylinder short and stiff, so side-load worries are minimal - still, 20 mm is the smallest MAR bore (there is no 16 mm option), and the next size up is the 25 mm bore at 245.3 N push / 206.1 N pull at 0.5 MPa. Need more? The 32 mm bore delivers 402.2 N in the same riveted body style. Mounting is built in: the U-type top bracket replaces a separate flange, while I or Y rod knuckles still thread onto M8x1.25. If your process must hold position through an air failure, add a rod lock - this cylinder has no holding function of its own.
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 MARU Stainless Steel Mini Cylinder MARU20X40S FAQ
Expect 157 N push and 131.9 N pull at 0.5 MPa, rising to 219.8 N and 184.7 N at 0.7 MPa, with a 32 kgf theoretical ceiling at 1.0 MPa. Ports are 1/8" on the 20 mm bore and the rod thread is M8x1.25 on an 8 mm rod.
No - the magnet is built into every MAR piston as standard, so CMSG, DMSG and EMSG reed or electronic switches mount straight on the barrel and feed end-of-stroke signals to your PLC without a special-order piston.
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