Airtac MIJ Adjustable Cylinder MIJ40X30-20S
The AirTAC MIJ Adjustable Cylinder MIJ40X30-20S is a genuine double acting, double rod, adjustable stroke round-body mini air cylinder with a Ø40mm bore and 30mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke30 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 MIJ40X30-20S
Dial in a precise forward end position on-site with the AirTAC MIJ40X30-20S, a round-body stainless mini cylinder featuring a 20mm adjustable extend window. Rather than swapping components to hit a new stop, an external screw trims the forward stroke down from the 30mm nominal length, while the retract stroke remains full. This double-acting actuator delivers substantial power, pushing with 628.3 N and pulling with 527.8 N at 0.5 MPa.
Built with a riveted stainless-steel barrel and a Ø16 mm piston rod, it withstands mild corrosion and washdown environments. The 1/4" port feeds the bore efficiently, and the integrated magnet (-S) supports CMSG, DMSG, or EMSG position switches. Fixed TPU bumper pads decelerate the stroke ends across the 30-800 mm/s speed range.
Airtac MIJ Adjustable Cylinder MIJ40X30-20S Technical Specifications
| Model | Airtac MIJ Adjustable Cylinder MIJ40X30-20S |
|---|---|
| Series | MIJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 MIJ40X30-20S
| MIJ | round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MIJ40X30-20S Is Used
Heavy Clamping Station
Secure heavy housings during machining by using the 20mm extend adjustment to dial the exact clamping depth without repositioning the fixture.
Staged Divert Gate
Sort dense packages by trimming the extend stroke on-site to alter the gate angle, accommodating different box sizes on the fly.
Is the Airtac MIJ Adjustable Cylinder MIJ40X30-20S the Right Cylinder?
When sizing this 40 mm bore, compare it directly against adjacent options. Stepping down to the MIJ32 drops the 0.5 MPa push force to 402.2 N, whereas this MIJ40 provides 628.3 N—useful if your payload approaches 38 kg. The 20mm adjustment window is ideal for taking up mechanical tolerances or staging feeds without machining new hard stops.
Remember that the external stop screw sets the extend endpoint but acts purely as a physical stop, not a mid-stroke lock. The piston will drift if air pressure drops, so install an external rod lock or pilot check valve for suspended loads. Mounting options include LB foot, FA flange, and TC trunnion (SDB is unavailable on this variant). Because this SKU includes the -S magnet, you can directly mount CMSG, DMSG, or EMSG sensors for end-position confirmation.
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 MIJ40X30-20S FAQ
This 40 mm bore cylinder uses a 1/4" port and a M12x1.25 male rod thread. At 0.5 MPa it pushes with 628.3 N and pulls with 527.8 N. At 0.7 MPa the push is 879.6 N and pull is 738.9 N. 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 10-30 mm; the retract stroke remains full. The -S suffix indicates a built-in piston magnet, enabling the use of 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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