Airtac MG Stainless Steel Mini Air Cylinder MG20X40S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG20X40S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionFixed anti-impact bumper pads
About the Airtac MG Stainless Steel Mini Air Cylinder MG20X40S
Compact where space is tight, the MG20X40S is a double acting JIS round-body mini cylinder with a 20 mm bore and a short 40 mm stroke. Its SUS304 stainless barrel and hard-chrome plated rod shrug off damp, washdown and outdoor conditions that quickly ruin painted-steel minis, and the riveted covers keep the body small and light. Because it follows the JIS mini-cylinder standard, standard JIS brackets and rod knuckles bolt straight on, which makes spares and redesigns painless.
Force output sits at 157 N push and 131.9 N pull at 0.5 MPa, rising to 219.8 N push at 0.7 MPa, with a theoretical ceiling of 32 kgf at 1.0 MPa. In practice, plan on roughly 94 N of usable work at 0.5 MPa, which corresponds to lifting about 8 kg vertically with a 2:1 margin - enough for small clamps, gates and light part transfer. The magnet built into the piston lets CMSG, DMSG or EMSG switches report rod position, and the fixed anti-impact bumper pads soften the stroke ends without adding an adjustable cushion.
Airtac MG Stainless Steel Mini Air Cylinder MG20X40S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG20X40S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| 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 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MG Stainless Steel Mini Air Cylinder MG20X40S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
| FA / LB / CB / SDB | Mounting: FA flange, LB foot, CB clevis, SDB pivot bracket (with CB). |
MG-family variants: MG / MGC (double acting ±cushion), MSG / MTG (single acting push / pull), MGD / MGCD (double rod ±cushion). Accessories: LB foot, FA flange, CB clevis, SDB pivot block, plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MG Stainless Steel Mini Air Cylinder MG20X40S Is Used
Small-parts presence checking
The built-in magnet and short 40 mm stroke suit a CMSG switch on a compact gauge or reject station, where the 157 N push at 0.5 MPa confirms a part is seated before the next cycle.
Bench-top carton flap tucking
On a light packaging line, about 94 N of usable force at 0.5 MPa tucks flaps and holds cartons during taping, and the stainless barrel wipes clean in damp or washed areas.
Lab fixture clamping
A 20 mm bore clamping slide on a test bench or sample fixture, where the JIS mounting footprint and M8x1.25 rod thread let builders swap in standard knuckles and brackets.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG20X40S the Right Cylinder?
At 20 mm bore this is the smallest MG available, so there is no bore below it - if 157 N push at 0.5 MPa feels marginal, step up to the MG25 (245 N) or the MG32 (402 N) instead. If you need higher speeds or heavier loads with gentler stops, move to the cushioned MGC range. The 40 mm stroke keeps the body very short, ideal where envelope height matters more than travel. Note that a plain MG drifts when air is lost or the valve centres - for a held load add an external rod lock or a pilot check valve. Mount with LB foot, FA flange, CB clevis or SDB pivot, and pair I or Y rod knuckles with the M8x1.25 male rod thread. The fitted magnet means CMSG / DMSG / EMSG switches work out of the box.
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 / CB / SDB) & 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 MG Stainless Steel Mini Air Cylinder MG20X40S FAQ
At 0.5 MPa it pushes with 157 N and pulls with 131.9 N. At 0.7 MPa those figures rise to 219.8 N push and 184.7 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure spans 0.15-1.0 MPa = 22-145 psi, with proof pressure of 1.5 MPa = 215 psi, and speed runs 30-800 mm/s.
Yes. The S in the model code means a piston magnet is factory-fitted, so AirTAC CMSG, DMSG or EMSG reed/electronic switches clip onto the stainless barrel to signal extend and retract positions without any modification.
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