Airtac MGC Stainless Steel Mini Cylinder MGC20X400S
The AirTAC Airtac MGC Stainless Steel Mini Cylinder MGC20X400S is a genuine double acting + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 400mm 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
- Stroke400 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 MGC20X400S
The AirTAC MGC20X400S is a double acting, JIS-standard round-body mini cylinder with a 20 mm bore and a 400 mm stroke, fitted with a variable air cushion at both ends. Unlike the bumper-type MG, the cushion needles let you dial in end-of-stroke deceleration, so this 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; at 0.7 MPa that rises to 219.8 N push and 184.7 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. The S code means a piston magnet is built in, so CMSG, DMSG or EMSG reed sensors can be clipped on for position feedback.
Construction follows the MG family recipe: a SUS304 stainless barrel with covers and stainless block riveted and rolled into place, 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 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, temperature range -20 to +70 C, and speed range 30-800 mm/s. As a computed buyer insight, apply the usual 0.6 safety factor to the 157 N push force and you get roughly 9.6 kgf, a sensible working load figure for sizing this cylinder. Note that the cushion only decelerates the stroke ends; it is not a lock, so use an external rod lock or pilot check valve if the load must be held on air loss.
Airtac MGC Stainless Steel Mini Cylinder MGC20X400S Technical Specifications
| Model | Airtac MGC Stainless Steel Mini Cylinder MGC20X400S |
|---|---|
| Series | MGC JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 400 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 MGC20X400S
| MGC | JIS round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×400 | 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 MGC20X400S Is Used
High-speed gate diverter on small conveyors
The variable air cushion absorbs the momentum of a fast-moving gate at both stroke ends, letting the 20 mm bore cycle at speed without cover impact, while the magnet feeds position signals to the PLC.
Light ejection and part kick-off
157 N push at 0.5 MPa is enough to kick small parts off fixtures or chutes, and the adjustable cushion stops the 8 mm rod from slamming at full extension on rapid eject cycles.
Indexed fixture clamping with position feedback
With CMSG or DMSG switches on the built-in magnet, the cylinder confirms extend and retract positions on assembly fixtures, and the cushion protects the fixture from end-of-stroke shock.
Is the Airtac MGC Stainless Steel Mini Cylinder MGC20X400S the Right Cylinder?
At 20 mm bore this is the smallest MGC available, so if you need more force step up to the 25 mm bore (245.3 N push at 0.5 MPa) or beyond; there is nothing smaller in the cushioned family. If your application is slow and light and you do not need adjustable deceleration, the plain bumper-type MG in the same bore is the lower-cost alternative for 20-40 mm bores. Size by real force, not bore: 157 N push at 0.5 MPa covers light slides, gates and small press fits, and running at 0.7 MPa lifts that to 219.8 N. The 400 mm stroke is comfortably within the 500 mm maximum standard stroke for this bore, so no made-to-order surcharge applies. Mount with the FA flange or LB foot, and add I or Y rod knuckles if the load pivots. The fitted magnet accepts CMSG, DMSG or EMSG switches. With a 400 mm stroke, watch side loads on the 8 mm rod: guide the load externally wherever the tooling allows.
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 MGC20X400S FAQ
At 0.5 MPa it pushes with 157 N and pulls with 131.9 N; at 0.7 MPa those rise to 219.8 N push and 184.7 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. Applying the common 0.6 safety factor to the 0.5 MPa push force gives about 9.6 kgf as a working load guideline, less for vertical lifting where you should halve the figure.
Needle valves at each end throttle the exhaust air to decelerate the piston smoothly near the stroke ends, and you adjust them to suit your speed and load. The cushion only brakes the end of travel; it is not a lock or brake, and the cylinder will not hold position if air pressure is lost. For a held load, add an external rod lock or pilot check valve.
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