Airtac MG Stainless Steel Mini Air Cylinder MG20X120S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X120S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 120mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ20 mm
- Stroke120 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionFixed anti-impact bumper pads
About the Airtac MG Stainless Steel Mini Air Cylinder MG20X120S
With a 20 mm bore and 120 mm stroke, this MG delivers about 157 N push and 131.9 N pull at 0.5 MPa, rising to 219.8 N push at 0.7 MPa. It is a double acting, JIS-standard round-body mini cylinder: a SUS304 stainless barrel riveted to the covers with a hard-chrome plated 8 mm rod, so it shrugs off damp, washdown and outdoor conditions that quickly ruin painted-steel minis. The port is 1/8" and the male rod thread is M8x1.25.
The S in the code means a magnet is already fitted, so CMSG, DMSG or EMSG switches can be clipped on for end-of-stroke sensing without reordering. At the stroke ends, fixed anti-impact bumper pads soften the direction change - they decelerate only and are not an adjustable air cushion. As a buyer rule of thumb, plan on roughly 94 N of real work at 0.5 MPa (about 60 percent of the rating), which is around 9 kg of vertical lift with a 2:1 margin.
Airtac MG Stainless Steel Mini Air Cylinder MG20X120S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X120S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| 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 | Fixed anti-impact bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MG-series (JIS standard) datasheet. Barrel: SUS304 stainless steel (round-body, riveted construction); piston rod: carbon steel with 20µm hard-chrome plating. Thread options: PT (blank) / G / NPT.
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 MG Stainless Steel Mini Air Cylinder MG20X120S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 20 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
| FA / LB / CB / SDB | Mounting: FA flange, LB foot, CB clevis, SDB pivot bracket (with CB). |
MG-family variants: MG / MGC (double acting ±cushion), MSG / MTG (single acting push / pull), MGD / MGCD (double rod ±cushion). Accessories: LB foot, FA flange, CB clevis, SDB pivot block, plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MG Stainless Steel Mini Air Cylinder MG20X120S Is Used
Small-parts presence checking
The fitted magnet and a CMSG switch confirm rod extension on a 120 mm verify station, with the 157 N push ample for probing light plastic or PCB fixtures.
Bench-top labelling and ejecting
A compact round body drops into tight packaging heads, where about 94 N of usable force at 0.5 MPa ejects cartons or presses labels without bruising product.
Damp-environment test rigs
The SUS304 stainless barrel and chrome rod tolerate humidity and light washdown in laboratory or food-lab fixtures where painted minis corrode.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X120S the Right Cylinder?
At 0.5 MPa this bore pushes 157 N; the next MG size up, bore 25, reaches 245.3 N, so step up if your mechanism needs more than about 9-10 kg of working force. There is no smaller MG bore. The 120 mm stroke is well inside the 500 mm standard range for this series. Remember the MG drifts when air is removed - the bumpers do not hold position - so add an external rod lock or pilot check valve if the load must stay put. Choose LB foot, FA flange or CB clevis mounting to suit the machine frame, and keep side loads off the 8 mm rod on longer travels.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting (LB / FA / CB / SDB) & knuckle
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/impact settings and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MG Stainless Steel Mini Air Cylinder MG20X120S FAQ
At 0.5 MPa it pushes 157 N and pulls 131.9 N; at 0.7 MPa, 219.8 N push and 184.7 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, and speed spans 30-800 mm/s.
Yes. The S suffix means a piston magnet is built in, so AirTAC CMSG, DMSG or EMSG reed/electronic switches clamp directly onto the stainless barrel for end-of-stroke signalling. A non-S MG bore 20 cannot take these switches.
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