Airtac MGD Double Rod Mini Cylinder MGD40X250S
The AirTAC Airtac MGD Double Rod Mini Cylinder MGD40X250S is a genuine double acting, double rod JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 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 MGD40X250S
The AirTAC MGD40X250S is a double acting, double rod JIS mini cylinder with a 40 mm bore and 250 mm stroke. A 16 mm rod exits both the front and rear covers with the same M14x1.5 male thread at each end, so the two rod ends travel together and 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, with a theoretical maximum of 107.6 kgf at 1.0 MPa. Because both sides of the piston see the rod-side area, there is no stronger push stroke to design around; the same figure applies extending and retracting. The through-rod resists rotation and side load, keeps stroke-end position repeatable, and leaves the rear rod end free to carry a stop flag or drive a second load.
Construction follows the JIS round-body mini format: a SUS304 stainless barrel with hard-chrome plated carbon steel rods, riveted covers, and a two-way lubricant-storing piston seal, suited to damp and washdown surroundings. Fixed anti-impact bumper pads decelerate the stroke ends; they are not adjustable cushions, so a load is not held or braked by them, and the piston will drift if air pressure is lost. The fitted magnet (the S in the code) accepts CMSG, DMSG or EMSG switches. Ports are 1/8" on every MGD bore, operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, speed range is 30-800 mm/s, and the working temperature spans -20 to +70 C. As a rule of thumb, keep the vertical working load to about 60% of the push force, roughly 32 kg for this bore.
Airtac MGD Double Rod Mini Cylinder MGD40X250S Technical Specifications
| Model | Airtac MGD Double Rod Mini Cylinder MGD40X250S |
|---|---|
| Series | MGD JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MGD40X250S
| MGD | JIS round-body mini cylinder (double-rod). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MGD40X250S Is Used
Anti-rotation pusher slide
The through-rod resists rotation and side load, so the MGD40X250S drives a guided pusher or gate through its 250 mm stroke without a separate anti-rotation key, with 527.8 N available in whichever direction the slide moves.
Twin-load transfer
Front and rear rod ends carry the same M14x1.5 thread, so one cylinder can lift or index two fixtures simultaneously, sharing the 527.8 N per-direction output between two symmetric workpieces.
Rear-mounted stop flag
The back rod end carries a stop block or switch flag while the front end does the work; with the fitted magnet, CMSG or DMSG switches confirm end positions along the 250 mm travel.
Is the Airtac MGD Double Rod Mini Cylinder MGD40X250S the Right Cylinder?
The 40 mm bore is the largest in the MGD range, delivering 527.8 N (about 53.8 kgf) each way at 0.5 MPa, so size down to a 32 mm bore (345.6 N) if your load is lighter, or up to the MGCD 50/63 bores if you need more force. Choose the MGCD instead if you need an adjustable variable cushion or a bore above 40 mm, and the single-rod MG if you do not need a through-rod. The 250 mm stroke sits within the 500 mm maximum standard stroke for this bore. The double rod suits anti-rotation slides, symmetric transfer and dual-load work; mount with an FA flange or LB foot (no SDB/CB pivot mounts on the double-rod) and add I or Y rod knuckles at the working end. The fitted magnet means CMSG/DMSG/EMSG switches can be mounted directly. For long strokes, support the load externally to limit side load on the 16 mm rod, and add an external rod lock or pilot check valve if the load must be held on air loss.
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 MGD40X250S FAQ
Because a rod occupies both sides of the piston, the force is equal in both directions: 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 is 1.5 MPa (215 psi), speed range is 30-800 mm/s, and temperature spans -20 to +70 C with air filtered to 40 um. Ports are 1/8" and the rod thread is M14x1.5 at both ends.
The MGD40X250S has a rod exiting both covers, giving equal force extending and retracting, better resistance to rotation and side load, and a free rear rod end for a stop flag or second load; the single-rod MG has a larger extend force but only one working end. The fixed bumper pads soften the stroke ends but are not adjustable cushions (that is the MGCD), and the cylinder will not hold a load on air loss, so use an external rod lock or pilot check valve for that. The fitted magnet accepts CMSG, DMSG and EMSG switches.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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