Airtac MG Stainless Steel Mini Air Cylinder MG20X400
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X400 is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 400mm 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
- Stroke400 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 MG20X400
With a 400 mm stroke on a 20 mm bore, this MG cylinder reaches deep into guards and fixtures while staying double acting: air drives the rod out and pulls it back, so there is no spring to rob force. At 0.5 MPa it pushes about 157 N and pulls about 131.9 N; at 0.7 MPa those figures rise to 219.8 N and 184.7 N, with a theoretical ceiling of 32 kgf at 1.0 MPa. The 8 mm hard-chrome-plated rod and 1/8" ports suit light-duty, long-reach work such as ejecting slim parts or actuating a distant gate.
The body follows the JIS mini-cylinder standard, so standard JIS brackets and I/Y rod knuckles bolt on without rework. A SUS304 stainless barrel rolled onto the covers shrugs off washdown and damp air far better than a painted mini, and a fixed anti-impact bumper pad softens the stroke ends. Plan on roughly 94 N (about 9.6 kg of vertical lift with a 2:1 margin) of real working force at 0.5 MPa rather than the full 157 N rating.
Airtac MG Stainless Steel Mini Air Cylinder MG20X400 Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X400 |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 400 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 MG20X400
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 20 | Bore size in mm. |
| ×400 | 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 MG20X400 Is Used
Ejecting slim parts from a stamping die
The 400 mm reach lets the 20 mm bore push light offcuts clear of a press die, with about 94 N of practical force at 0.5 MPa after margin.
Long-reach gate or lid actuation on packaging lines
A 157 N push at 0.5 MPa is ample for swinging a light guard gate, and the stainless barrel copes with daily washdown between product changeovers.
Sample probe in a lab or test rig
The 8 mm chrome rod extends 400 mm into a test chamber, and the fixed bumper pad damps the probe's return stroke without adjustable cushioning.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X400 the Right Cylinder?
Size it against neighbours: the MG20 pushes about 157 N at 0.5 MPa, the MG25 about 245 N and the MG32 about 402 N. If your part or gate needs more than roughly 90 N of usable force, step up a bore. At 400 mm the 8 mm rod is long and slender, so keep side loads off the rod and guide the load externally. This SKU has no magnet, so CMSG/DMSG/EMSG switches cannot be fitted; order the -S version if you need position sensing. Note that with no rod lock or check valve the rod drifts if air is lost, so clamp externally where holding matters.
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 MG20X400 FAQ
At 0.5 MPa it pushes about 157 N and pulls about 131.9 N. At 0.7 MPa the figures are 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, speed 30-800 mm/s, and the port is 1/8".
Not on this SKU. It has no built-in magnet, and the CMSG, DMSG and EMSG switches only work with the magnet option, which is ordered as the S code (for example MG20X400S). The stainless JIS body itself is otherwise identical, with the same 1/8" ports and fixed bumper pads.
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