Airtac MGD Double Rod Mini Cylinder MGD40X125S
The AirTAC Airtac MGD Double Rod Mini Cylinder MGD40X125S is a genuine double acting, double rod 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, double rod
- Rod threadM14×1.5
- CushionFixed anti-impact bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MGD Double Rod Mini Cylinder MGD40X125S
The AirTAC MGD40X125S is a JIS round-body mini cylinder, double acting with a double rod: a 16 mm hard-chrome steel rod exits both the front and back covers with the same M14x1.5 male thread at each end. Because the rod-side piston area is active on both sides, the output force is equal in both directions - about 527.8 N each way at 0.5 MPa and 738.9 N at 0.7 MPa - so there is no separate push and pull rating to juggle. The through-rod resists rotation and side load, keeps stroke-end position repeatable, and leaves the back rod end free to carry a stop flag or drive a second load.
Built for demanding duty, the 40 mm bore barrel is SUS304 stainless with riveted covers, and the fixed anti-impact bumper pad decelerates the piston at each stroke end. The fitted magnet (the S code) allows CMSG, DMSG or EMSG switches to be clamped on either rod. Air supply is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, and speed runs 30-800 mm/s over a -20 to +70 C range. As a rule of thumb, keep the working load near 0.6 of the push force - roughly 530 N, or about 26 kg in a vertical lift - and use an external rod lock or pilot check valve if the load must be held on air loss.
Airtac MGD Double Rod Mini Cylinder MGD40X125S Technical Specifications
| Model | Airtac MGD Double Rod Mini Cylinder MGD40X125S |
|---|---|
| Series | MGD JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting, double rod |
| 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
Double-rod: a rod exits both covers, so output force is equal in both directions (rod-side area used).
Model Code: Airtac MGD Double Rod Mini Cylinder MGD40X125S
| MGD | JIS round-body mini cylinder (double-rod). |
|---|---|
| 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 MGD Double Rod Mini Cylinder MGD40X125S Is Used
Anti-rotation pusher slide
The through-rod keeps the tool plate from twisting as the 527.8 N push moves cartons or fixtures along a conveyor station, with the bumper pad softening both stroke ends.
Twin-load transfer
Front and rear M14x1.5 rod ends drive two grippers or ejector pins at once, each seeing the same 738.9 N at 0.7 MPa for symmetric action.
Rear-mounted stop flag
The back rod end carries a stop block or switch flag while the front end does the work, and the fitted magnet feeds CMSG/DMSG/EMSG position signals to the PLC.
Is the Airtac MGD Double Rod Mini Cylinder MGD40X125S the Right Cylinder?
At 40 mm bore the MGD40X125S is the largest MGD: 527.8 N per direction at 0.5 MPa suits heavier slides and twin-load pushes. If you need more force, a longer standard stroke (up to 500 mm on this bore), or an adjustable air cushion, step up to the MGCD series (which adds 50 mm and 63 mm bores); for a single-rod cylinder, choose the MG. The double rod is the right pick when anti-rotation guidance, symmetric transfer, or a rear-mounted switch/stop flag matters. Mount with the FA flange or LB foot and add I or Y rod knuckles (no SDB/CB pivots on the double-rod design). The -S magnet accepts CMSG/DMSG/EMSG switches. On long strokes, support the side load externally - the through-rod tolerates more than a single rod but is not a guide bearing. Ports are 1/8" on every MGD bore.
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/impact settings and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MGD Double Rod Mini Cylinder MGD40X125S FAQ
Because both sides of the piston see the rod-side area, output is equal both ways: 527.8 N at 0.5 MPa and 738.9 N at 0.7 MPa, with a theoretical maximum of 107.6 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-800 mm/s, and the port is 1/8". The bore is 40 mm with a 16 mm rod and M14x1.5 threads at both ends; the maximum standard stroke for this bore is 500 mm, so 125 mm is a standard stroke.
The MGD has a rod exiting both covers, so force is identical in extend and retract, the rod resists rotation and side load, and the rear end can carry a stop flag or a second load - the single-rod MG has a larger push than pull and no rear rod. This model is double acting with fixed anti-impact bumper pads only; the bumpers soften the stroke ends but do not lock or brake the load, and the piston will drift if air is lost, so fit an external rod lock or pilot check valve for load holding. The -S magnet lets you mount CMSG, DMSG or EMSG switches.
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