Airtac MGC Stainless Steel Mini Cylinder MGC20X125S
The AirTAC Airtac MGC Stainless Steel Mini Cylinder MGC20X125S is a genuine double acting + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm stroke, M5×0.8 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 sizeM5×0.8
- Acting typeDouble acting + cushion
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MGC Stainless Steel Mini Cylinder MGC20X125S
The AirTAC MGC20X125S is a double acting JIS-standard round-body mini cylinder with a 20 mm bore and 125 mm stroke, fitted with a variable air cushion at both stroke ends. Unlike the fixed bumper pad on the plain MG, this adjustable cushion lets you tune the needle valve to decelerate the piston smoothly near end of travel, so the cylinder tolerates higher piston speeds and heavier moving loads without hammering the covers. At 0.5 MPa it delivers 157 N push and 131.9 N pull, rising to 219.8 N push at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
Construction follows the JIS mini-cylinder footprint: a SUS304 stainless barrel with covers and stainless block riveted and rolled onto it, plus a hard-chrome plated (20 um) carbon-steel rod and a two-way piston seal that also stores lubricant. The 8 mm rod carries a male M8x1.25 thread and air is supplied through M5x0.8 ports. Operating pressure spans 0.15 to 1.0 MPa (22 to 145 psi), speed range is 30 to 800 mm/s, and the fitted magnet (the S code) accepts CMSG, DMSG or EMSG reed switches for position feedback. Mounting options are FA flange or LB foot, with I and Y rod knuckles available.
Airtac MGC Stainless Steel Mini Cylinder MGC20X125S Technical Specifications
| Model | Airtac MGC Stainless Steel Mini Cylinder MGC20X125S |
|---|---|
| Series | MGC JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 mm |
| Acting type | Double acting + cushion |
| Port size | M5×0.8 |
| 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 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 MGC Stainless Steel Mini Cylinder MGC20X125S
| MGC | JIS round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
| FA / LB | Mounting: FA flange, LB foot. |
MG-family variants: MG / MGC (double acting ±cushion), MSG / MTG (single acting push / pull), MGD / MGCD (double rod ±cushion). Accessories: LB foot, FA flange, plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MGC Stainless Steel Mini Cylinder MGC20X125S Is Used
High-speed small-part ejection
The adjustable air cushion lets this 20 mm bore cycle at up to 800 mm/s and decelerate the 157 N push stroke smoothly, ejecting small components without end-of-travel impact.
Light press and forming stations
With 219.8 N push at 0.7 MPa, the cushioned stroke suits light pressing, staking or forming of small parts where a hard stop would damage tooling.
Position-feedback slide actuation
The fitted magnet accepts CMSG or DMSG switches, so the 125 mm stroke can drive a small slide or gate with end-position confirmation on both directions.
Is the Airtac MGC Stainless Steel Mini Cylinder MGC20X125S the Right Cylinder?
At 20 mm bore this is the smallest MGC offered, so size up if you need more force: the 25 mm bore pushes 245.3 N and the 32 mm bore 402.2 N at 0.5 MPa, while the 63 mm bore tops the range at 1557.9 N. If your application runs slowly with light loads and you do not need end-of-stroke deceleration, the bumper-type MG in the same 20 mm bore is the no-cushion alternative. The variable air cushion is the reason to choose MGC when piston speed or moving mass would otherwise slam the covers. Order the FA flange or LB foot mounting, add I or Y rod knuckles if the tooling needs a pivot, and keep the S suffix (as on this MGC20X125S) whenever CMSG, DMSG or EMSG sensing is planned. Strokes up to 500 mm are standard for this bore; longer strokes to 800 mm are made to order, and long strokes should be checked for side load on the 8 mm rod.
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) & 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 and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MGC Stainless Steel Mini Cylinder MGC20X125S FAQ
At 0.5 MPa it pushes with 157 N and pulls with 131.9 N. At 0.7 MPa the figures are 219.8 N push and 184.7 N pull, and the theoretical maximum is 32 kgf at 1.0 MPa. For safe working loads, size around 60 percent of the push force, roughly 94 N or about 9.6 kgf; for a vertical lift, halve the push force to about 8 kgf.
The cushion needle at each end meters the exhaust air to decelerate the piston smoothly near end of stroke, and you adjust it to suit your speed and load. It only decelerates the stroke end; it is not a lock or brake, and the MGC does not hold position on air loss. For a held load, add an external rod lock or pilot-operated check valve.
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