Airtac MIJ Adjustable Cylinder MIJ40X400-20S
The AirTAC MIJ Adjustable Cylinder MIJ40X400-20S is a genuine double acting, double rod, adjustable stroke round-body mini air cylinder with a Ø40mm bore and 400mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MIJ Adjustable Cylinder MIJ40X400-20S
Trimming the forward end by up to 20 mm via an external stop screw, this round-body mini cylinder lets you fine-tune the extend position from 380 to 400 mm on-site. The retract stroke remains full, and the screw simply sets the end stop rather than acting as a mid-stroke lock. Built with a stainless-steel barrel and Ø16 rod, it provides mild corrosion resistance for washdown or humid settings.
It uses a 1/4" port, runs at 30-800 mm/s, and relies on fixed TPU bumper pads to decelerate the stroke end. The -S suffix equips the piston with a magnet for CMSG, DMSG, or EMSG sensors.
Airtac MIJ Adjustable Cylinder MIJ40X400-20S Technical Specifications
| Model | Airtac MIJ Adjustable Cylinder MIJ40X400-20S |
|---|---|
| Series | MIJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 mm |
| Acting type | Double acting, double rod, adjustable stroke |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
MIJ / MICJ are double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac MIJ Adjustable Cylinder MIJ40X400-20S
| MIJ | round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MI-family variants: MI / MIC (double acting ±cushion), MSI / MTI (single acting push / pull), MID / MICD (double rod ±cushion), MIJ / MICJ (double rod, adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MIJ Adjustable Cylinder MIJ40X400-20S Is Used
Heavy Diverter Gate
Pushes large cartons on a packaging line with 628.3 N at 0.5 MPa, using the 20 mm extend adjustment to dial in the exact deflection angle for varying box sizes.
Vertical Flap Folder
Folds thick cardboard flaps during case erecting, utilizing the 32 kg vertical lift capacity and the stainless build to withstand dusty, washdown-prone environments.
Is the Airtac MIJ Adjustable Cylinder MIJ40X400-20S the Right Cylinder?
When sizing this 40 mm bore, dropping down to an MIJ32 reduces the 0.5 MPa push force to 402.2 N, while no larger standard MIJ bore exists above it. The 20 mm adjustment window is ideal for taking up mechanical tolerances during setup or covering multiple stop positions with a single part number. Note that a plain cylinder drifts on air loss; the bumper only softens the end impact, so install an external rod lock or pilot check valve if you must hold a suspended load.
Mounting options include LB foot, FA flange, and TC trunnion brackets, along with CA, U, R, or CM back covers, but the SDB pivot block is not offered on this adjustable variant. Because this SKU includes the -S magnet, you can directly mount CMSG, DMSG, or EMSG switches for position sensing.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC)
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 Use correct back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MIJ Adjustable Cylinder MIJ40X400-20S FAQ
The theoretical maximum force is 128.1 kgf at 1.0 MPa. This 40 mm bore cylinder uses a 1/4" air port and a male M12x1.25 rod thread.
An external stop screw shortens the forward stroke by up to 20 mm, letting you set the extend end position between 380 and 400 mm without changing the cylinder; the retract stroke remains full. The -S suffix means a piston magnet is built-in, allowing you to use CMSG, DMSG, or EMSG sensors for position detection.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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