Airtac MG Stainless Steel Mini Air Cylinder MG40X25S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X25S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM14×1.5
- CushionFixed anti-impact bumper pads
About the Airtac MG Stainless Steel Mini Air Cylinder MG40X25S
Built to the JIS mini-cylinder standard, the MG40X25S is a double acting round-body actuator with a 40 mm bore and a short 25 mm stroke. Its SUS304 stainless barrel is riveted to the covers around a hard-chrome plated 16 mm rod, so the body shrugs off damp washdown and outdoor air far better than painted-steel minis. At 0.5 MPa it pushes with 628.3 N and pulls with 527.8 N; at 0.7 MPa those figures rise to 879.6 N and 738.9 N, with a theoretical ceiling of 128.1 kgf at 1.0 MPa.
Because the S code is in this SKU, a magnet is already fitted in the piston, so CMSG, DMSG or EMSG switches can be clipped on for end-position sensing without ordering a special build. In practice, plan on roughly 377 N of real work at 0.5 MPa rather than the full rating, and for vertical lifts expect it to raise about 32 kg with a 2:1 margin. The fixed anti-impact bumper pads soften the direction change at each end of the 25 mm travel; they decelerate only and are not an adjustable air cushion.
Airtac MG Stainless Steel Mini Air Cylinder MG40X25S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X25S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| 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 | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MG40X25S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MG40X25S Is Used
Pneumatic press and clamp fixtures
The 628.3 N push at 0.5 MPa (879.6 N at 0.7 MPa) suits short-stroke clamping of brackets and small assemblies on machining and assembly fixtures.
Packaging machine pushers
A 25 mm stroke with 30-800 mm/s speed and a magnet for CMSG sensing fits product reject or case-nudge pushers on filling and cartoning lines.
Washdown food and bottling equipment
The SUS304 stainless round barrel and hard-chrome rod hold up in wet, rinsed-down zones where painted mini cylinders corrode.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X25S the Right Cylinder?
At 40 mm bore this is the strongest base MG: 628.3 N push at 0.5 MPa versus 563.0 N from the 32 mm below it. If your load needs under about 400 N of working force, the MG32 saves space and air; if you need controlled deceleration at higher speeds or heavier loads, step up to the cushioned MGC, which also reaches 50 mm and 63 mm bores. Ports are 1/8" on every MG bore, and mounting options are LB foot, FA flange, CB clevis and SDB pivot, with I and Y rod knuckles for the rod side.
The 25 mm stroke suits short clamp, press and position moves. Note that with the valve centred or air lost, the piston drifts freely - the bumpers do not lock anything - so add an external rod lock or pilot check valve if the load must stay put. Keep side loads off the 16 mm rod on long or cantilevered tooling.
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 MG40X25S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa, 879.6 N push and 738.9 N pull. The theoretical maximum is 128.1 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-800 mm/s, and the port is 1/8".
S means a piston magnet is factory-fitted, so CMSG, DMSG or EMSG reed or solid-state switches can be mounted directly on the barrel to signal end positions. A SKU without the S cannot take these switches. Also note the fixed bumper pads only soften the stroke end - they are not an adjustable cushion and do not hold a load when air is removed.
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