Airtac MG Stainless Steel Mini Air Cylinder MG20X125
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X125 is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm 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
- Stroke125 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 MG20X125
With a 157 N push and 131.9 N pull at 0.5 MPa, this MG20X125 is a double acting JIS round-body mini cylinder sized for compact pushers and small lift tasks. Its 20 mm bore drives an 8 mm hard-chrome-plated rod over a 125 mm stroke, and the riveted SUS304 stainless barrel shrugs off damp shop air far better than a painted-steel mini.
Because the body follows the JIS mini-cylinder standard, standard JIS brackets and I/Y rod knuckles bolt straight on, which keeps spares simple. At 0.5 MPa the usable working push is roughly 94 N (about 60% of rating), so this cylinder comfortably lifts around 9 kg vertically with a 2:1 margin. Note the fixed anti-impact bumper pads only soften the stroke ends - they are not an adjustable cushion, and the rod will drift if air is lost.
Airtac MG Stainless Steel Mini Air Cylinder MG20X125 Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X125 |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MG20X125
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | 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 MG20X125 Is Used
Bottle rejection arm
A short side-kick on a bottling line needs only about 94 N of working force at 0.5 MPa - well inside the 157 N push rating - and the stainless barrel tolerates frequent washdown.
Small fixture lift
Raising a 9 kg jig or nest vertically on a test bench suits the 20 mm bore with a 2:1 margin, and the 125 mm stroke covers typical fixture travel.
Lab sample press
Light clamping and sample-holding stations use the 219.8 N push available at 0.7 MPa, with the bumper pad softening each stroke end.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X125 the Right Cylinder?
Step down: there is no smaller MG bore, so 20 mm is the entry point at 157 N push @0.5 MPa. Step up: MG25X125 gives 245.3 N push at the same pressure - choose it when loads approach the 20 mm limit. If you need end-of-stroke damping you can adjust, the cushioned MGC is the variant to pick, not this bumper model.
This SKU has no -S magnet, so CMSG / DMSG / EMSG switches cannot be fitted; order an S-coded model if sensing is needed. Mount with LB foot, FA flange, CB clevis or SDB pivot. With a 125 mm stroke and an 8 mm rod, keep side loads low to avoid rod bending.
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 MG20X125 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 range is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, and speed runs 30-800 mm/s.
No. This SKU lacks the built-in -S magnet, so no switch can be detected. Order an S-coded version to use CMSG, DMSG or EMSG reed/hall sensors. Also note the fixed bumper pad only decelerates the stroke end - it does not hold or brake a load, and the rod drifts when air is removed.
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