Airtac MG Stainless Steel Mini Air Cylinder MG40X125
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X125 is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 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 MG40X125
With the largest bore in the MG family, the MG40X125 delivers 628.3 N of push force and 527.8 N of pull at 0.5 MPa (879.6 N / 738.9 N at 0.7 MPa) through a 125 mm stroke, in a double acting JIS round-body package. Air filtered to 40 um drives it across 0.15-1.0 MPa = 22-145 psi, at speeds of 30-800 mm/s and temperatures from -20 to +70 C.
The SUS304 stainless barrel with a hard-chrome plated 16 mm rod shrugs off washdown and damp plant air far better than painted-steel minis, and because the MG follows the JIS mini-cylinder standard, standard JIS brackets and rod knuckles bolt straight on. In practice the 628.3 N push means you can plan on roughly 375 N of real working force at 0.5 MPa, or lift about 32 kg vertically with a 2:1 margin. A fixed anti-impact bumper pad softens each stroke end; it decelerates only and is not an adjustable air cushion.
Airtac MG Stainless Steel Mini Air Cylinder MG40X125 Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X125 |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MG40X125
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MG40X125 Is Used
Pallet-eject pin on a warehouse transfer cart
The 628.3 N push at 0.5 MPa (about 64 kgf) drives a locking pin into a pallet stop on battery-charging transfer carts, where the stainless barrel survives damp cold-store air.
Case clamp on a carton sealing line
Clamping corrugated cases against a sealing head needs the 527.8 N pull force to hold flaps square; the fixed bumper pad keeps the clamp cycle quiet at 30-800 mm/s speeds.
Sample press in a water-treatment lab bench
Pressing filter samples with roughly 375 N of usable force at 0.5 MPa, the SUS304 body and chrome rod stand up to splashes that would rust a painted mini cylinder.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X125 the Right Cylinder?
At 40 mm bore this is the top of the MG range: 628.3 N push at 0.5 MPa versus 563.0 N for the 32 mm and 343.4 N for the 25 mm. If your load needs less than about 560 N, the MG32X125 saves space and air; if you need more force or an adjustable cushion for high-speed stops, step up to the cushioned MGC series in 50 or 63 mm bore. Note that a plain MG drifts when air is lost or the valve centres - for a held load add an external rod lock or a pilot check valve. This SKU carries no S magnet, so CMSG / DMSG / EMSG switches cannot be fitted; order the -S version if position sensing is planned. Mount with LB foot, FA flange, CB clevis or SDB pivot, and pair the 16 mm rod with I or Y knuckles; keep side loads low on the 125 mm stroke to protect the rod and bushing.
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 MG40X125 FAQ
At 0.5 MPa the 40 mm bore gives 628.3 N push and 527.8 N pull; at 0.7 MPa it reaches 879.6 N push and 738.9 N pull. The theoretical maximum is 128.1 kgf at 1.0 MPa. Operating range is 0.15-1.0 MPa = 22-145 psi with a 1.5 MPa = 215 psi proof pressure, and the port on every bumper MG bore, including this one, is 1/8".
Not as supplied - this SKU has no built-in magnet. Order the MG40X125S variant and CMSG, DMSG or EMSG reed/hall switches can be clipped onto the SUS304 barrel to signal end positions. The cylinder itself is double acting with a fixed anti-impact bumper pad at each stroke end; the bumper only softens the stop, so an unsupported load will drift if air pressure is removed.
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