Airtac MGC Stainless Steel Mini Cylinder MGC40X125
The AirTAC Airtac MGC Stainless Steel Mini Cylinder MGC40X125 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 MGC40X125
The AirTAC MGC40X125 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-style MG, the cushion needles let you dial in deceleration near each 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 527.8 N of pull force, and the theoretical maximum is 128.1 kgf at 1.0 MPa. As a rule of thumb, keep the working load near 0.6 of the push force, which gives a safe working figure of roughly 38 kg for this model.
Construction follows the MG family recipe: a SUS304 stainless barrel with covers and stainless block riveted and rolled into place, plus a hard-chrome plated 20 um carbon-steel rod (16 mm diameter, male thread M14x1.5) and a two-way piston seal that also stores lubricant. Ports are 1/8". It operates on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), survives a 1.5 MPa (215 psi) proof pressure, runs from -20 to +70 C at 30-800 mm/s, and mounts via FA flange or LB foot with I and Y rod knuckles available. The optional S code adds a magnet for CMSG, DMSG or EMSG switches; this SKU has no magnet, so no sensor can be fitted. Note that the cushion only decelerates the stroke end and does not lock or hold the load on air loss.
Airtac MGC Stainless Steel Mini Cylinder MGC40X125 Technical Specifications
| Model | Airtac MGC Stainless Steel Mini Cylinder MGC40X125 |
|---|---|
| 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 MGC40X125
| 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 MGC40X125 Is Used
Case push-off on packaging lines
Pushing cartons or trays off a conveyor at cycle speeds above what a bumper MG tolerates; the variable air cushion absorbs the arrival so the 628.3 N push does not hammer the covers.
Small press and forming fixtures
Light staking, riveting or marking heads where the 128.1 kgf theoretical force at 1.0 MPa is enough and the adjustable cushion protects the tooling at the bottom of the stroke.
Gate and diverter actuation
Swinging or lifting product diverters on transfer lines, where fast 30-800 mm/s travel plus end-of-stroke deceleration keeps the mechanism from slamming.
Is the Airtac MGC Stainless Steel Mini Cylinder MGC40X125 the Right Cylinder?
Size the MGC40X125 by comparing real 0.5 MPa push forces: the MGC32 pushes 402.2 N, this 40 mm bore pushes 628.3 N, and the next step up, the MGC50, pushes 981.3 N. If your load cycles fast or arrives hard at the covers, the adjustable air cushion is the reason to pick MGC over the plain bumper MG, which is offered only up to 40 mm and has a fixed pad instead. For 125 mm stroke this is a standard length (the family goes to 500 mm standard, and non-standard strokes up to 800 mm are made to order). Choose the FA flange or LB foot mounting, add I or Y rod knuckles if the tooling needs a swivel, and order the S code if you want CMSG, DMSG or EMSG position sensing. With a 16 mm rod, keep side loads off the rod at longer strokes and guide the load externally where the application demands it.
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 MGC40X125 FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum is 128.1 kgf at 1.0 MPa. For sizing, keep the working load near 0.6 of the push force, about 38 kg equivalent.
The cushion needles at both ends throttle the exhaust near end of travel so you can tune deceleration for higher speeds or heavier moving loads; it is adjustable, not a fixed bumper pad. It only slows the piston and 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.
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