Airtac MG Stainless Steel Mini Air Cylinder MG40X300S
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG40X300S is a genuine double acting JIS-standard round-body mini air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 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 MG40X300S
With a 40 mm bore pushing 628.3 N at 0.5 MPa (879.6 N at 0.7 MPa), the MG40X300S is the strongest standard MG in the range, delivered as a double acting JIS round-body mini cylinder with a 300 mm stroke. Air drives the rod out and back, a fixed anti-impact bumper pad softens each end of travel, and the fitted magnet lets CMSG, DMSG or EMSG switches report position without any retrofit. The barrel is SUS304 stainless steel riveted onto the covers, so the body shrugs off washdown and damp air far better than painted-steel minis.
For sizing the load, treat roughly 0.6 of the push force as usable work at 0.5 MPa, which is about 377 N, and expect a vertical lift of roughly 32 kg with a 2:1 margin (64 kg at the full 628.3 N). The 16 mm hard-chrome-plated rod carries the M14x1.5 male thread, ports are 1/8" on every MG bore, and the JIS mounting footprint accepts standard mini-cylinder brackets and rod knuckles, so spares and fixtures stay interchangeable. Note that when air is lost the piston drifts freely - the bumper pad only decelerates, so fit an external rod lock or pilot check valve if the load must stay put.
Airtac MG Stainless Steel Mini Air Cylinder MG40X300S Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG40X300S |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MG40X300S
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MG40X300S Is Used
Pallet-eject pin on packing lines
The 628.3 N push at 0.5 MPa drives a locating pin that indexes pallets into a strapping station, while the SUS304 barrel copes with daily washdown in the food-packaging area.
Lid-lift on a bakery tray dryer
Lifting about 32 kg tray lids vertically with a 2:1 margin, the 300 mm stroke clears a full rack height and the magnet-fed DMSG switch confirms the open position to the PLC.
Press-assist on a small assembly fixture
At 0.7 MPa the bore delivers 879.6 N to seat bushings into housings, and the fixed bumper pad takes the sting out of the rapid approach at up to 800 mm/s.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG40X300S the Right Cylinder?
At 0.5 MPa this bore gives 628.3 N push and 527.8 N pull, while the next MG down (bore 32) manages only 402.2 N push - so step up to 40 mm when your mechanism needs that extra margin on clamping or lifting. If you later need adjustable end-of-stroke deceleration for fast, heavy cycles, the cushioned MGC extends the family to 50 and 63 mm bores. The 300 mm stroke sits well inside the 500 mm standard limit, but a long rod like this is side-load sensitive: guide the workpiece externally rather than letting the rod take lateral force. Choose LB foot, FA flange, CB clevis or SDB pivot mounting, and remember the S in this code means the magnet is already built in for CMSG / DMSG / EMSG sensing.
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 MG40X300S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum is 128.1 kgf at 1.0 MPa. Operating range is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, and speed runs 30-800 mm/s.
Yes - the S in the code means the piston magnet is factory-fitted, so CMSG, DMSG and EMSG reed switches clip straight onto the stainless barrel. Mounting choices are LB foot, FA flange, CB clevis and SDB pivot bracket, with I or Y rod knuckles on the M14x1.5 male rod thread. Ports are 1/8".
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