Airtac MGD Double Rod Mini Cylinder MGD20X400
The AirTAC Airtac MGD Double Rod Mini Cylinder MGD20X400 is a genuine double acting, double rod JIS-standard round-body mini air cylinder with a Ø20mm bore and 400mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ20 mm
- Stroke400 mm
- Port size1/8"
- Acting typeDouble acting, double rod
- Rod threadM8×1.25
- 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 MGD20X400
The AirTAC MGD20X400 is a JIS-standard round-body mini cylinder, double acting and double rod: a piston rod exits both the front and rear covers with the same M8x1.25 male thread at each end, so the two rod ends travel together. Because the rod-side area is active on both sides of the piston, the output force is equal in both directions, about 131.9 N at 0.5 MPa and 184.7 N at 0.7 MPa, with a theoretical maximum of 26.9 kgf at 1.0 MPa. The through-rod resists rotation and side load, keeps stroke-end position repeatable, and lets the rear rod end carry a stop flag or drive a second load.
This 400 mm stroke exceeds the 300 mm maximum standard stroke for the 20 mm bore, so it is supplied as a non-standard, made-to-order length. Construction is a SUS304 stainless barrel with a hard-chrome steel rod and riveted covers, suited to damp and washdown environments, with a fixed anti-impact bumper pad at each stroke end to soften deceleration. Operating range 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 air supply filtered to 40 um. Ports are 1/8". As a rough rule of thumb, plan on about 8 kg as a safe vertical load at 0.5 MPa.
Airtac MGD Double Rod Mini Cylinder MGD20X400 Technical Specifications
| Model | Airtac MGD Double Rod Mini Cylinder MGD20X400 |
|---|---|
| Series | MGD JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 400 mm |
| Acting type | Double acting, double rod |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 300 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 (Ø20mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 132 N |
| 0.7 MPa | 185 N |
| Max (@1.0 MPa) | 27 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 MGD20X400
| MGD | JIS round-body mini cylinder (double-rod). |
|---|---|
| 20 | Bore size in mm. |
| ×400 | 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 MGD20X400 Is Used
Anti-rotation linear slide
The through-rod resists rotation and side load, driving a small guided slide or gate through a 400 mm travel without extra anti-rotation hardware.
Twin-load push
Both rod ends push simultaneously with about 131.9 N each way at 0.5 MPa, ejecting or transferring two small parts per cycle in symmetric fashion.
Rear-mounted stop flag
The back rod end carries a stop or position flag over the long 400 mm stroke, giving a repeatable external reference point at each end of travel.
Is the Airtac MGD Double Rod Mini Cylinder MGD20X400 the Right Cylinder?
At 20 mm bore this is the smallest MGD, delivering 131.9 N per direction at 0.5 MPa, so size up to the 25 mm bore (206.1 N) or 32 mm bore (345.6 N) if your load needs more force. The 400 mm stroke is above the 300 mm standard maximum for this bore and is made to order. Choose the MGD over the single-rod MG when you need anti-rotation guidance, equal force both ways, or a rear rod end for a switch flag or second load; choose the MGCD if you need an adjustable cushion or a 50/63 mm bore. Mounting is LB foot or FA flange, with I and Y rod knuckles available (no SDB/CB pivot on the double-rod). This unit has no magnet, so no CMSG/DMSG/EMSG switch can be fitted; add the S code if you need position sensing. On a 400 mm stroke, keep side load on the rod low and support the work if needed.
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 MGD20X400 FAQ
Because both sides of the piston see the rod-side area, force is equal in both directions: 131.9 N at 0.5 MPa and 184.7 N at 0.7 MPa, with a theoretical maximum of 26.9 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" on this 20 mm bore.
The MG has one rod, so its extend force is higher than its retract force; the MGD20X400 has a rod at both covers, giving equal force both ways plus anti-rotation stiffness and a rear rod end for a flag or second load. This model has no magnet, so no CMSG, DMSG or EMSG sensor can be mounted; order the S code version to enable sensing. Note the cylinder does not hold its load on air loss, so use an external rod lock or pilot check valve for a held load.
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