Airtac MGD Double Rod Mini Cylinder MGD20X400S
The AirTAC Airtac MGD Double Rod Mini Cylinder MGD20X400S 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 MGD20X400S
The MGD20X400S is a double acting, double-rod JIS round-body mini cylinder with a 20 mm bore and a 400 mm stroke. A piston rod exits both covers with the same M8x1.25 male thread at each end, so the two rod ends move together and 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. Because both sides of the piston see the rod-side area, there is no separate push and pull figure. 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.
Construction follows the JIS mini-cylinder footprint: a SUS304 stainless barrel with hard-chrome plated rods, riveted covers, a two-way lubricant-storing piston seal and a fixed anti-impact bumper pad that softens the stroke ends. It runs on 40 um filtered air at 0.15-1.0 MPa (22-145 psi), tolerates a 1.5 MPa (215 psi) proof pressure, works from -20 to +70 C at 30-800 mm/s, and ports are 1/8" on every MGD bore. The S code means a magnet is fitted, so CMSG, DMSG or EMSG switches can be mounted on the barrel. Note that the 400 mm stroke exceeds the 300 mm maximum standard stroke for a 20 mm bore, so this model is made to order.
Airtac MGD Double Rod Mini Cylinder MGD20X400S Technical Specifications
| Model | Airtac MGD Double Rod Mini Cylinder MGD20X400S |
|---|---|
| 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 MGD20X400S
| 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 MGD20X400S Is Used
Anti-rotation slide
The through-rod keeps a 400 mm light-duty slide from rotating over its full travel, holding stroke-end position repeatable without external guides.
Twin-load push
Drive two small fixtures or chutes at once, one load on each M8x1.25 rod end, with about 131.9 N delivered at each end at 0.5 MPa.
Rear-mounted flag
Use the back rod end to carry a switch or stop flag while the front end does the work, with the fitted magnet feeding CMSG/DMSG/EMSG position signals.
Is the Airtac MGD Double Rod Mini Cylinder MGD20X400S the Right Cylinder?
At 131.9 N per direction at 0.5 MPa, this is the smallest force class in the MGD range; the 20 mm bore is the smallest MGD, and the 40 mm bore gives about 527.8 N if you need roughly four times the force. For bores of 50 or 63 mm, or if you need an adjustable air cushion instead of the fixed bumper pad, move to the MGCD; for a single-rod cylinder, the MG is the equivalent. The 400 mm stroke is non-standard for this bore (standard tops out at 300 mm), so expect made-to-order lead time. Long strokes like this benefit from the through-rod's side-load and anti-rotation behaviour, but support the rod if the application imposes lateral loads. Mount with FA flange or LB foot, add I or Y rod knuckles as needed, and keep the S magnet if you plan to fit CMSG/DMSG/EMSG switches. The cylinder does not hold position on air loss, so use an external rod lock or pilot check valve for a held load.
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 MGD20X400S FAQ
Force is equal in both directions because the rod-side area works both ways: 131.9 N at 0.5 MPa, 184.7 N at 0.7 MPa, and a theoretical maximum of 26.9 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, on air filtered to 40 um, from -20 to +70 C at 30-800 mm/s. Ports are 1/8" and the rod thread is M8x1.25 at both ends.
The MGD has a rod exiting both covers, so force is identical extending and retracting, the rod resists rotation and side load, and the rear end can carry a flag or a second load; the single-rod MG has a larger extend force but none of these benefits. Both use the fixed anti-impact bumper pad, not an adjustable cushion (that is the MGCD). The S in MGD20X400S means a magnet is fitted, so CMSG, DMSG or EMSG switches can be mounted on the barrel.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac MGD Double Rod Mini Cylinder MGD20X400S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.