Airtac MIJ Adjustable Cylinder MIJ20X250-40S
The AirTAC Airtac MIJ Adjustable Cylinder MIJ20X250-40S is a genuine double acting, adjustable stroke round-body mini air cylinder with a Ø20mm bore and 250mm stroke, 1/8" air ports and a stainless-steel barrel and rod for mildly corrosive environments. Its ISO 6432 mounting interface makes it a compact drop-in for standard mini-cylinder fixtures.
- BoreØ20 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM8×1.25
- 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 MIJ20X250-40S
Trimming the forward end position by up to 40 mm on site, the AirTAC MIJ20X250-40S lets you tune the extend stroke from 250 mm down to 210 mm without swapping parts. This double-acting, round-body mini cylinder delivers 157 N of push force at 0.5 MPa, making it suitable for medium-duty positioning tasks.
Built with a stainless-steel barrel and rod, the riveted construction handles mild washdown environments while conforming to the ISO 6432 mounting interface for easy bracket drops. The -S suffix equips the piston with a magnet for CMSG, DMSG, or EMSG sensors. Air connects via a 1/8" port, and fixed TPU bumper pads absorb the stroke end impacts.
Airtac MIJ Adjustable Cylinder MIJ20X250-40S Technical Specifications
| Model | Airtac MIJ Adjustable Cylinder MIJ20X250-40S |
|---|---|
| Series | MIJ ISO 6432 mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MIJ20X250-40S
| MIJ | ISO 6432 round-body mini cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -40 | 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 MIJ20X250-40S Is Used
Sorter Diverter Stroke Tuning
Dial in the exact 220 mm extend reach to push mixed-size boxes onto a secondary belt without overtravel, using the 157 N push force to pivot the guide arm reliably.
Variable Depth Carton Sealing
Adjust the forward stop down by 40 mm on the fly to match different carton depths, using the 8 kg vertical lift capacity to hold the sealing head in place during changeover.
Staged Parts Ejection
Set intermediate extend positions for ejecting parts at different points in a machining cell, relying on the 1/8" port and 30-800 mm/s speed range to cycle quickly.
Is the Airtac MIJ Adjustable Cylinder MIJ20X250-40S the Right Cylinder?
When sizing this 20 mm bore, stepping down to an MIJ16 yields 100.5 N push at 0.5 MPa, while stepping up to an MIJ25 provides 245.3 N. The 40 mm adjustment window is highly useful for taking up mechanical tolerances or staging feeds across changeover jobs, allowing one SKU to cover several intermediate stops. The safe working load is roughly 94 N, translating to a vertical lift of about 8 kg with a 2:1 margin.
You can mount this unit using LB foot, FA flange, or TC trunnion brackets, plus CA, U, R, or CM back covers, but the SDB pivot block is not available on this adjustable variant. Remember that the external stop screw sets the end position but does not function as a mid-stroke lock; the piston will drift on air loss, so add an external rod lock or pilot check valve if you need to hold a load.
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 MIJ20X250-40S FAQ
This 20 mm bore cylinder uses a 1/8" air port. At 0.5 MPa it provides 157 N push and 131.9 N pull. At 0.7 MPa it provides 219.8 N push and 184.7 N pull. The theoretical maximum force is 32 kgf at 1.0 MPa.
An external stop screw shortens the extend stroke by up to 40 mm on site, giving a usable forward range of 210-250 mm, while retract remains full. The -S suffix means a piston magnet is built-in for CMSG, DMSG, or EMSG sensors. The stop screw only sets the end position and is not a mid-stroke lock.
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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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