Airtac MG Stainless Steel Mini Air Cylinder MG20X125S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X125S 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 MG20X125S
With a 20 mm bore and 125 mm stroke, this MG delivers about 157 N of push force at 0.5 MPa (219.8 N at 0.7 MPa) in a compact double acting package built to the JIS mini-cylinder standard. The barrel is SUS304 stainless steel rolled onto the covers, and the 8 mm rod is hard-chrome plated, so the body shrugs off damp air, light washdown and outdoor exposure far better than painted-steel minis. Because the footprint follows JIS, standard mini-cylinder brackets and I or Y rod knuckles bolt straight on.
The 125 mm stroke ends meet a fixed anti-impact bumper pad that softens the direction change - it decelerates only and is not an adjustable air cushion. The fitted magnet means CMSG, DMSG or EMSG switches can be clamped anywhere along the barrel for end-position sensing. As a sizing rule of thumb, plan on roughly 94 N of usable work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin.
Airtac MG Stainless Steel Mini Air Cylinder MG20X125S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X125S |
|---|---|
| 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 MG20X125S
| 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 MG20X125S Is Used
Small parts presence check
The built-in magnet and 125 mm stroke suit a CMSG switch on a fixture that confirms a machined aluminium blank has seated before drilling begins.
Carton tab folding
About 94 N of usable push at 0.5 MPa folds cardboard tabs on a semi-auto packing bench, with the bumper pad quieting each stroke end.
Lab sample pusher
The SUS304 stainless barrel and hard-chrome rod handle occasional wipe-downs in a sample-handling unit that indexes trays about 8 kg vertically.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X125S the Right Cylinder?
Bore 20 is the smallest MG, so if 157 N of push at 0.5 MPa is marginal for your load, step up to bore 25 (245.3 N at 0.5 MPa) rather than over-pressurising. Remember that a plain MG will drift if air is lost or the valve centres - the bumper pads do not hold anything - so add an external rod lock or a pilot check valve for a load that must stay put. The S in MG20X125S confirms the magnet is already fitted; without it no sensor can be mounted. Mount with LB foot, FA flange, CB clevis or SDB pivot bracket, and keep side loads off the 8 mm rod on longer strokes.
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 MG20X125S FAQ
At 0.5 MPa it pushes 157 N and pulls 131.9 N; at 0.7 MPa it pushes 219.8 N and pulls 184.7 N. The theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, and speed runs 30-800 mm/s.
Yes - the S code means the piston magnet is factory-fitted, so CMSG, DMSG or EMSG reed switches clamp onto the SUS304 barrel anywhere along the 125 mm stroke. A non-S MG bore 20 cannot take these switches.
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