Airtac MG Stainless Steel Mini Air Cylinder MG40X125S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X125S 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 MG40X125S
With the largest bore in the MG family, the MG40X125S delivers 628.3 N of push and 527.8 N of pull at 0.5 MPa, rising to 879.6 N at 0.7 MPa. This double acting JIS round-body mini cylinder pairs a 125 mm stroke with a 16 mm hard-chrome-plated rod (M14x1.5 male thread) and a riveted SUS304 stainless barrel that shrugs off washdown and damp shop air far better than painted-steel minis. The fitted magnet means CMSG, DMSG or EMSG switches can be clipped on for end-of-stroke signalling without any rework.
In practice, plan on roughly 377 N (about 38 kg of force) for real work at 0.5 MPa, which lets this cylinder lift a part of around 32 kg vertically with a 2:1 margin. Fixed anti-impact bumper pads decelerate the rod at each end of travel, softening direction changes at speeds up to 800 mm/s. Note that the bumpers only soften the stroke end: if the load must stay put when air is lost, add an external rod lock or a pilot check valve, since the piston will drift on its own.
Airtac MG Stainless Steel Mini Air Cylinder MG40X125S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X125S |
|---|---|
| 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 MG40X125S
| 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 MG40X125S Is Used
Pallet-stamp actuator
The 628.3 N push at 0.5 MPa drives a date or batch stamp onto cartons on a warehouse palletising line, with the magnet feeding a done signal to the PLC.
Filling-head press-off
Presses caps or lids home on food-line filling heads, where the SUS304 barrel and chrome rod stand up to daily washdown better than painted minis.
Fixture clamp on a welding jig
Clamps steel brackets into a welding fixture with about 38 kg of usable force at 0.5 MPa, releasing instantly on valve reversal thanks to double acting air.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X125S the Right Cylinder?
At 40 mm bore this is the top of the standard MG range: 628.3 N push at 0.5 MPa versus 402.2 N for the 32 mm bore below it. If your duty needs more force or an adjustable cushion for high speeds or heavy loads, step up to the MGC series, which extends the range to 50 mm and 63 mm bores. The 125 mm stroke sits well inside the 500 mm standard limit, so no made-to-order lead time applies.
This SKU carries the built-in magnet, so position sensing with CMSG / DMSG / EMSG switches works out of the box. Mount it with an FA flange, LB foot, CB clevis or SDB pivot bracket, and fit I or Y rod knuckles on the tooling side. Because the 16 mm rod is the largest in the family, side loads are still worth avoiding on long overhangs; guide the load externally where the tooling cantilevers.
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 MG40X125S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa those rise to 879.6 N and 738.9 N. The theoretical maximum is 128.1 kgf at 1.0 MPa. Operating pressure spans 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating, speed runs 30-800 mm/s, and the 1/8" port suits every bore in the bumper MG family.
No. The fixed anti-impact bumper pads only decelerate the rod at the stroke ends; they are not a brake or lock, and the piston will drift if pressure is lost or the valve centres. For a held load, add an external rod lock or a pilot check valve. The fitted magnet does allow CMSG, DMSG or EMSG switches to report rod position, and the JIS-standard mounting interface accepts standard foot, flange, clevis and pivot brackets.
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