Airtac MG Stainless Steel Mini Air Cylinder MG40X250S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X250S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM14×1.5
- CushionFixed anti-impact bumper pads
About the Airtac MG Stainless Steel Mini Air Cylinder MG40X250S
With a 40 mm bore pushing 628.3 N at 0.5 MPa (879.6 N at 0.7 MPa), the MG40X250S is a double acting JIS round-body mini cylinder built for compact machines that still need real muscle. The 250 mm stroke runs at 30-800 mm/s on 0.15-1.0 MPa (22-145 psi) of filtered air, and the fixed anti-impact bumper pads soften the rod at both stroke ends without adding the bulk of an adjustable cushion.
The barrel is SUS304 stainless steel riveted onto the covers, paired with a 16 mm hard-chrome plated rod, so the body shrugs off washdown and damp workshop air far better than painted minis. Because the footprint follows the JIS mini-cylinder standard, standard brackets and I/Y rod knuckles bolt straight on. The built-in magnet accepts CMSG, DMSG or EMSG switches for end-of-stroke sensing. At 0.5 MPa the push force equates to about 64 kgf, so halving for a 2:1 margin this cylinder lifts roughly 32 kg vertically.
Airtac MG Stainless Steel Mini Air Cylinder MG40X250S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X250S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | 1/8" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MG40X250S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | 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 MG40X250S Is Used
Pallet ejector on packing lines
The 628.3 N push at 0.5 MPa slides loaded pallets or carton stacks off a conveyor stop, and the stainless barrel handles washdown between shifts.
Lift-and-locate fixture in machining cells
With about 32 kg of safe vertical lift at a 2:1 margin, it raises jigs or clamped parts on the 250 mm stroke while the magnet feeds position signals to the PLC.
Bottle-line reject pusher
Fast 30-800 mm/s cycling across a 250 mm stroke kicks off-spec containers, with the fixed bumper pad absorbing the direction change at each end.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X250S the Right Cylinder?
At 628.3 N push and 527.8 N pull at 0.5 MPa, the 40 mm bore sits at the top of the MG range; if your load needs under 402.2 N at 0.5 MPa, the 32 mm bore saves space and air, while heavier or faster-duty cycles should step up to the cushioned MGC series in 50 or 63 mm. Plan on about 377 N (roughly 60% of the rated push) as the realistic working force at 0.5 MPa. Note that when air is removed the piston drifts freely - for a load that must stay put, add an external rod lock or a pilot check valve. The -S magnet is already fitted, so CMSG/DMSG/EMSG switches work out of the box; pick LB foot, FA flange or CB clevis mounting to suit the machine frame. With a 250 mm stroke on a 16 mm rod, keep side loads low and guide the load externally if the tooling overhangs.
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 MG40X250S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa that rises to 879.6 N push and 738.9 N pull. The theoretical maximum is 128.1 kgf at 1.0 MPa. It runs double acting on 0.15-1.0 MPa (22-145 psi) air at 30-800 mm/s, with a 1/8" port and a 16 mm rod threaded M14x1.5.
Yes - the S in the model code means a piston magnet is already built in, so AirTAC CMSG, DMSG or EMSG reed/hall switches clip directly onto the stainless barrel for end-of-stroke detection. No magnet version would not accept these switches.
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