Airtac MG Stainless Steel Mini Air Cylinder MG40X50S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X50S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MG40X50S
With a 40 mm bore pushing 628.3 N (about 64 kgf) at 0.5 MPa and 879.6 N at 0.7 MPa, this MG40X50S is the strongest of the standard MG bores in a compact round body. It is a double acting JIS-standard mini cylinder with a 50 mm stroke, a 16 mm hard-chrome-plated rod (M14x1.5 male thread) and 1/8" ports. The SUS304 stainless barrel is riveted to the covers, so the body shrugs off damp, washdown-prone spots that quickly corrode painted-steel minis, and its JIS mounting footprint drops straight onto standard mini-cylinder brackets and rod knuckles.
The S in the code means a piston magnet is already fitted, so CMSG, DMSG or EMSG switches can be clipped on for end-of-stroke detection without ordering a special build. At the stroke ends, fixed anti-impact bumper pads soften the direction change - they decelerate the piston only and are not an adjustable air cushion. For planning: keep real work to roughly 377 N (0.6 of the 0.5 MPa push), which means this cylinder lifts about 32 kg vertically with a 2:1 margin. If air is lost the rod drifts freely, so add an external rod lock or a pilot check valve where a load must stay put.
Airtac MG Stainless Steel Mini Air Cylinder MG40X50S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X50S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MG40X50S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MG40X50S Is Used
Clamping fixtures on a CNC machining line
A 50 mm stroke and 628.3 N push at 0.5 MPa clamp brackets or castings in machining fixtures; planning around 377 N of usable force leaves margin for tooling friction.
Ejector on a food-packaging conveyor
The SUS304 stainless barrel and chrome rod cope with washdown around packaging lines, while the fitted magnet drives a CMSG switch to confirm each push-off.
Part-lift assist on an assembly pallet
Lifting about 32 kg vertically with a 2:1 margin, the cylinder raises small castings or pallet inserts; a pilot check valve holds the load if air pressure drops.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X50S the Right Cylinder?
At 628.3 N push and 527.8 N pull at 0.5 MPa, the 40 mm bore sits a clear step above the 32 mm MG (402.2 N push), so step down only when your load is under about 240 N of real work. If you need more force or faster cycles with heavier loads, the cushioned MGC extends the range to 50 and 63 mm bores. The short 50 mm stroke suits clamping, ejecting and part-presenting moves rather than long transfers; keep side loads off the 16 mm rod on any stroke.
Mount it with an FA flange, LB foot, CB clevis or SDB pivot bracket, and add I or Y rod knuckles where the tooling must swing. The fitted magnet already supports CMSG / DMSG / EMSG sensing. Remember the bumper pads do not hold position: when the valve centres or air drops, the piston drifts, so use a check valve or rod lock for held loads.
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 MG40X50S 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 1.5 MPa (215 psi) proof pressure, on clean air filtered to 40 um, at speeds of 30-800 mm/s and -20 to +70 C.
The S means a piston magnet is built in, so CMSG, DMSG or EMSG reed switches can be mounted for position signalling. The bumper pad at each stroke end is a fixed anti-impact pad that only decelerates the piston - it is not an adjustable cushion (that is the MGC) and it never locks or holds a load.
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