Airtac MGC Stainless Steel Mini Cylinder MGC40X125S
The AirTAC Airtac MGC Stainless Steel Mini Cylinder MGC40X125S is a genuine double acting + cushion 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 + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
About the Airtac MGC Stainless Steel Mini Cylinder MGC40X125S
The AirTAC MGC40X125S is a double acting JIS-standard round-body mini cylinder with a 40 mm bore and 125 mm stroke, fitted with a variable air cushion at both stroke ends. Unlike the bumper-type MG, the cushion needles let you dial in smooth deceleration near end of travel, so this cylinder can run at higher piston speeds and carry heavier moving loads without hammering the covers. At 0.5 MPa it delivers 628.3 N of push force, and the fitted magnet (the S in the code) allows CMSG, DMSG or EMSG switches to be mounted for position feedback.
Construction follows the JIS mini-cylinder footprint: a SUS304 stainless barrel with covers and stainless block riveted and rolled onto it, plus a hard-chrome plated 16 mm rod (male thread M14x1.5) and a two-way piston seal that also stores lubricant. Air supply should be filtered to 40 um, operating pressure spans 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, temperature range is -20 to +70 C, and speed range is 30-800 mm/s. Ports are 1/8". Note that the air cushion only decelerates the stroke end; it is not a lock or brake, so use an external rod lock or pilot check valve if the load must be held on air loss.
Airtac MGC Stainless Steel Mini Cylinder MGC40X125S Technical Specifications
| Model | Airtac MGC Stainless Steel Mini Cylinder MGC40X125S |
|---|---|
| Series | MGC JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting + cushion |
| 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 | Variable air cushion, both ends |
| 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 MGC Stainless Steel Mini Cylinder MGC40X125S
| MGC | JIS round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
| FA / LB | Mounting: FA flange, LB foot. |
MG-family variants: MG / MGC (double acting ±cushion), MSG / MTG (single acting push / pull), MGD / MGCD (double rod ±cushion). Accessories: LB foot, FA flange, plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MGC Stainless Steel Mini Cylinder MGC40X125S Is Used
High-speed conveyor stop and push
The variable air cushion absorbs the momentum of fast-moving cartons at stroke end, letting this 40 mm bore cylinder cycle at higher speeds than a bumper-type MG without cover impact.
Light press and forming station
With 628.3 N push at 0.5 MPa (879.6 N at 0.7 MPa), the MGC40X125S suits small staking, embossing and assembly presses where adjustable deceleration protects tooling.
Palletizing part ejector
The cushioned stroke end smoothly kicks parts off transfer points in packaging lines, and the fitted magnet allows CMSG or DMSG switches to confirm each eject cycle.
Is the Airtac MGC Stainless Steel Mini Cylinder MGC40X125S the Right Cylinder?
At 40 mm bore, the MGC40X125S sits in the middle of the MGC range: it pushes 628.3 N at 0.5 MPa versus 402.2 N for the 32 mm bore, while the 50 mm bore steps up to 981.3 N. If your application runs at moderate speed with light moving loads and you do not need end-of-stroke tuning, the bumper-type MG (offered in bores 20 to 40) is the no-cushion alternative; choose the MGC when deceleration control matters. For sizing, a rule of thumb is to treat about 0.6 of the push force as the safe working figure: 628.3 N at 0.5 MPa is roughly 64 kgf, so plan on about 38 kg safe working load, or roughly 32 kg for vertical lifting. Mounting is FA flange or LB foot, with I and Y rod knuckles available, and the fitted magnet supports CMSG/DMSG/EMSG switches. At 125 mm the stroke is well within the 500 mm standard limit; for long strokes, watch side load on the 16 mm rod and consider external guidance.
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) & 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 and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MGC Stainless Steel Mini Cylinder MGC40X125S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push rises to 879.6 N and pull to 738.9 N. The theoretical maximum at 1.0 MPa is 128.1 kgf. In practice, size the application to about 0.6 of the 0.5 MPa push force, roughly 38 kg safe working load.
Adjustable cushion needles at both stroke ends throttle the exhaust air to decelerate the piston smoothly near end of travel, so you can tune the cushioning to your speed and load. The cushion is not a lock or brake: on air loss the rod will move, so fit an external rod lock or pilot check valve for a held load. The SUS304 barrel and hard-chrome 16 mm rod keep the build corrosion resistant.
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