Airtac MG Stainless Steel Mini Air Cylinder MG20X250S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X250S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 250mm 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
- Stroke250 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 MG20X250S
With a 20 mm bore and a 250 mm stroke, this MG cylinder is a double acting, JIS-standard round-body mini cylinder built around a riveted SUS304 stainless barrel with a hard-chrome plated rod. At 0.5 MPa it delivers about 157 N of push and 131.9 N of pull, rising to 219.8 N push at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa. The fixed anti-impact bumper pads at each stroke end soften direction changes, and because the S code is in the model, CMSG / DMSG / EMSG switches can be fitted straight onto the body.
For sizing, treat roughly 94 N (0.6 of the 157 N push) as the realistic working force at 0.5 MPa, which corresponds to lifting about 8 kg vertically with a 2:1 margin. The SUS304 barrel and chrome rod shrug off damp, washdown and outdoor conditions far better than painted-steel minis, and the JIS mounting footprint means standard JIS mini-cylinder brackets and I or Y rod knuckles bolt on without rework. Ports are 1/8" on all four MG bores, and the 250 mm stroke sits comfortably inside the 500 mm standard range.
Airtac MG Stainless Steel Mini Air Cylinder MG20X250S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X250S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 250 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 MG20X250S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 20 | Bore size in mm. |
| ×250 | 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 MG20X250S Is Used
Lab sample pusher
The 94 N usable working force at 0.5 MPa is enough to slide sample trays and racks between stations, while the SUS304 barrel tolerates repeated wipe-downs in clean areas.
Light conveyor gating
With 157 N push and a 250 mm reach, this cylinder swings or pushes small parts off a conveyor lane, and the magnet feeds a CMSG switch for end-of-stroke confirmation.
Carton flap tuck
About 8 kg of vertical lift capacity with a 2:1 margin covers flap-tucking and light press-down moves on cartoning heads, with the bumper pad damping each reversal.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X250S 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 the 25 mm bore (245.3 N push at 0.5 MPa) or the 32 mm bore (402.2 N). At 250 mm the rod is 8 mm, so keep side loads low and guide the load externally if the stroke is long relative to the workpiece. If you need adjustable end-of-stroke cushioning rather than the fixed bumper pads, the MGC variant is the one to choose. Foot (LB), flange (FA), clevis (CB) and SDB pivot mounts are available; note that a plain MG drifts when air is lost, so add an external rod lock or a pilot check valve if the load must stay put.
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 MG20X250S FAQ
At 0.5 MPa it pushes with 157 N and pulls with 131.9 N; at 0.7 MPa that rises to 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), proof pressure is 1.5 MPa (215 psi), speed range is 30-800 mm/s, and the port is 1/8".
Yes. The S in MG20X250S means a magnet is built into the piston, so CMSG, DMSG or EMSG reed/electronic switches clip directly onto the SUS304 barrel for end-of-stroke signalling. A non-S MG body cannot take these switches.
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