Airtac MG Stainless Steel Mini Air Cylinder MG40X400S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X400S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke400 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 MG40X400S
With a 40 mm bore pushing 628.3 N at 0.5 MPa (879.6 N at 0.7 MPa), this double acting MG40X400S covers the top of the MG range: a 400 mm stroke on a 16 mm hard-chrome-plated rod with an M14x1.5 male thread and a 1/8" port on every cover. The barrel is SUS304 stainless steel rolled onto the covers in classic JIS round-body style, so the cylinder shrugs off washdown, humidity and outdoor exposure far better than painted-steel minis, and its mounting footprint matches standard JIS mini-cylinder brackets and rod knuckles.
The 400 mm stroke is well inside the 500 mm standard limit, so no made-to-order build is needed. The fitted magnet (the S in the code) lets you clip CMSG, DMSG or EMSG reed switches anywhere along the barrel for end-of-stroke signalling. At the ends of travel, fixed anti-impact bumper pads soften the direction change - they decelerate the piston but are not an adjustable air cushion. As a practical sizing note, plan on roughly 377 N (about 38 kg of vertical lift equivalent) of usable push at 0.5 MPa rather than the full 628.3 N rating, which leaves margin for friction and pressure droop.
Airtac MG Stainless Steel Mini Air Cylinder MG40X400S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X400S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 MG40X400S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 MG40X400S Is Used
Packaging machine push-off
Ejecting filled cartons from a conveyor lane at 0.5 MPa uses about 628.3 N of push - ample for a 20 kg carton with margin, with the 400 mm stroke clearing a wide lane.
Fixture clamp-and-lift on assembly benches
Raising a 30 kg welding fixture vertically: the 40 mm bore lifts roughly 64 kg at 0.5 MPa, so a 2:1 margin still holds, and the magnet signals top-of-stroke to the PLC.
Outdoor test-rig actuation
The SUS304 stainless barrel and chrome rod resist rain and mild washdown on semi-exposed test stands, where painted aluminium minis corrode and seize.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X400S the Right Cylinder?
At 40 mm bore this is the strongest standard MG: 628.3 N push / 527.8 N pull at 0.5 MPa, one step up from the 32 mm bore (402.2 N push). If your load needs more than 879.6 N at 0.7 MPa, move to the cushioned MGC series, which extends to 50 and 63 mm bores. Keep in mind that when air is lost or the valve centres, the piston drifts freely - for a held load add an external rod lock or a pilot check valve. Mount it with LB foot, FA flange or CB clevis brackets (SDB pivot used with CB), and add I or Y rod knuckles on the tooling side. On a 400 mm stroke, guide the load externally: side loads bend the 16 mm rod and wear the seals early.
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 MG40X400S 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) with a 1.5 MPa (215 psi) proof pressure, speed range 30-800 mm/s, air filtered to 40 um, and a 1/8" port on both covers.
The S means a magnet is built into the piston, so CMSG, DMSG or EMSG switches can be mounted on the barrel for position sensing. The bumper pads at each stroke end are fixed anti-impact pads that only soften the piston's arrival - they are not an adjustable air cushion (that is the MGC series) and they do not lock or hold a load when air is removed.
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