Airtac MG Stainless Steel Mini Air Cylinder MG20X400S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X400S 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 MG20X400S
With a 400 mm reach on a compact 20 mm barrel, this MG20X400S is a double acting JIS round-body mini cylinder built around a SUS304 stainless tube riveted to its covers, paired with a hard-chrome plated 8 mm rod. The fixed anti-impact bumper pads soften each end of the long travel, and because the body follows the JIS mini-cylinder standard it drops straight onto standard JIS brackets and rod knuckles when you need a like-for-like replacement. At 0.5 MPa it pushes about 157 N and pulls about 131.9 N.
For sizing the real job: keep the working force near 94 N (roughly 60% of the 157 N push rating) and you can expect it to lift about 8 kg vertically with a 2:1 margin. The fitted magnet means CMSG, DMSG or EMSG switches can be clamped anywhere along the 400 mm stroke for end-of-travel or mid-position sensing, and the 1/8" ports take PT fittings as standard.
Airtac MG Stainless Steel Mini Air Cylinder MG20X400S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X400S |
|---|---|
| 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 MG20X400S
| 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 MG20X400S Is Used
Bottle rejection pusher
The 400 mm stroke sweeps rejected bottles or cartons sideways off a packaging line, with the magnet and a CMSG switch confirming the pusher is home before the next product arrives.
Small-part lift gate
Lifting a lightweight gate or tray of about 8 kg or less between two conveyor levels, where the 157 N push at 0.5 MPa gives a comfortable 2:1 margin.
Position-checked ejector
Ejecting stamped or moulded pieces from a light fixture, with DMSG switches reading extend and retract positions along the full 400 mm travel.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X400S the Right Cylinder?
At 157 N push (0.5 MPa) this 20 mm bore suits light clamping, sorting and small part transfer over a long 400 mm travel. If your load needs more, step up to the 25 mm bore MG (about 245 N push at 0.5 MPa); if 157 N is generous, there is no smaller MG bore, so consider shortening the stroke or checking a smaller AirTAC series. Note that with air removed or the valve centred the rod drifts freely - the bumpers only soften the stroke ends, so use an external rod lock or pilot check valve where the load must stay put. The S in the code confirms the magnet is already fitted for CMSG/DMSG/EMSG switches; mounting options are LB foot, FA flange, CB clevis or SDB pivot, and on a 400 mm stroke keep side loads low to protect the 8 mm rod from 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 MG20X400S FAQ
At 0.5 MPa it pushes about 157 N and pulls about 131.9 N; at 0.7 MPa about 219.8 N push and 184.7 N pull. The theoretical maximum at 1.0 MPa is 32 kgf. 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 in MG20X400S means the magnet is built into the piston, so AirTAC CMSG, DMSG or EMSG reed/hall switches clamp directly onto the 400 mm stainless barrel at any position. The stainless SUS304 body and JIS-standard mounting interface also make it a straightforward swap in existing JIS mini-cylinder installations.
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