Airtac MIJ Adjustable Cylinder MIJ40X50-20S
The AirTAC Airtac MIJ Adjustable Cylinder MIJ40X50-20S is a genuine double acting, adjustable stroke round-body mini air cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
About the Airtac MIJ Adjustable Cylinder MIJ40X50-20S
Dial in your forward end position on-site with the AirTAC MIJ40X50-20S, a round-body stainless steel mini cylinder featuring a 20 mm extend-stroke adjustment window. An external stop screw lets you shorten the forward stroke from its 50 mm nominal length down to 30 mm without swapping parts, while the retract stroke remains full. Built with a riveted stainless barrel and piston rod, it handles mild washdown and corrosion exposure. It uses a 1/4" port and a 16 mm rod with an M12x1.25 male thread.
This double-acting 40 mm bore generates 628.3 N of push force at 0.5 MPa, yielding a safe working load around 377 N or a vertical lift capacity of roughly 32 kg with a 2:1 safety margin. The included magnet (-S) supports CMSG, DMSG, and EMSG position switches. Deceleration is handled by fixed TPU bumper pads, as this variant does not use adjustable air cushions.
Airtac MIJ Adjustable Cylinder MIJ40X50-20S Technical Specifications
| Model | Airtac MIJ Adjustable Cylinder MIJ40X50-20S |
|---|---|
| Series | MIJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 mm |
| Acting type | Double acting, 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 | 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 MIJ Adjustable Cylinder MIJ40X50-20S
| MIJ | round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 (adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MIJ Adjustable Cylinder MIJ40X50-20S Is Used
Precision Gauging Stops
Use the 20 mm extend adjustment to fine-tune the forward stop position for varying part lengths on a gauging fixture, capitalizing on the 628.3 N push force to hold heavy workpieces.
Staged Diverting Arms
Trim the extend stroke on-site to set exact diverting distances for different box sizes on a washdown conveyor without changing the cylinder mounting.
Heavy Pallet Changeover
Lift and position roughly 32 kg of tooling or pallets vertically, adjusting the forward reach by up to 20 mm to accommodate stack height variations.
Is the Airtac MIJ Adjustable Cylinder MIJ40X50-20S the Right Cylinder?
For lighter push requirements, stepping down to the MIJ32 bore drops the 0.5 MPa push force to 402.2 N, whereas this 40 mm bore delivers 628.3 N. There is no larger standard MIJ bore, making this the top force option in the series. The 20 mm adjustment window is ideal for taking up mechanical tolerances during setup or covering several intermediate stops with one part number. The stop screw sets the forward end position but is not a mid-stroke lock; the piston will drift on air loss, so add an external rod lock or pilot check valve for held loads. Mounting options include LB, FA, and TC styles, but the SDB pivot block is not available on this adjustable variant.
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 MIJ40X50-20S FAQ
This 40 mm bore cylinder uses a 1/4" port. At 0.5 MPa it provides 628.3 N push and 527.8 N pull force. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
An external stop screw shortens the extend stroke by up to 20 mm on-site, allowing a usable forward range of 30 to 50 mm; the retract stroke remains full. The -S suffix denotes a built-in piston magnet for use with CMSG, DMSG, or EMSG sensors. Fixed TPU bumpers decelerate the stroke ends.
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