Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 250mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel for mildly corrosive environments. For the same bore and stroke it is shorter than an ISO 6432 cylinder, saving mounting space.
- BoreØ20 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
- 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 MFCJ Adjustable Mini Cylinder MFCJ20X250-40
Dial in exact end positions on-site with the AirTAC MFCJ20X250-40, a JIS-standard round-body mini cylinder featuring a 40 mm adjustable extend window (usable stroke 210-250 mm) and needle-set variable air cushions at both ends. The riveted SUS304 stainless barrel with aluminium covers is purposefully shorter than an ISO 6432 unit of the same bore and stroke, saving valuable machine space while resisting mild washdown corrosion.
Driven by filtered air through a 1/8" port, this double-acting 20 mm bore generates 157 N of push force at 0.5 MPa (219.8 N at 0.7 MPa), yielding a safe working load of about 94 N or a 2:1 vertical lift capacity near 8 kg. Note this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| 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 | Variable air cushion, both ends |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MF/MFC (JIS-standard) datasheet. Barrel: SUS304 stainless steel; covers: aluminum alloy (round-body, riveted rolling-packed construction). Thread options: PT (blank) / G / NPT.
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 MFCJ Adjustable Mini Cylinder MFCJ20X250-40
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MF-family variants: MF / MFC (double acting ±cushion), MSF / MTF (single acting push / pull), MFD / MFCD (double rod ±cushion), MFJ / MFCJ (adjustable stroke ±cushion). Back covers CA / U / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 Is Used
Light Part Ejection
Tunes the 40 mm extend window to strike plastic mouldings precisely, while the air cushion decelerates the 157 N push force for quiet high-speed cycling.
Transfer Diverter
Adjusts the stroke on the fly to route varying package sizes without changing hardware, absorbing end-of-travel shock at speeds up to 800 mm/s.
Lab Test Fixture
Provides repeatable clamping up to 94 N safe load, allowing operators to fine-tune the extend position for delicate sensor or component trial fits.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 the Right Cylinder?
When sizing this series, compare the real thrust: this 20 mm bore delivers 157 N push at 0.5 MPa, whereas stepping up to an MFCJ25 provides 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where shock deceleration is critical. The variable air cushion soaks up end-of-stroke impact but acts only as a decelerator, never a lock; the piston will drift on air loss, so fit an external rod lock or pilot check valve if you need true load holding.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover mount is available on this adjustable build). Because this exact model has no -S magnet, it cannot support magnetic sensing—select the -S variant if your cycle requires CMSG, DMSG or EMSG switches.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/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/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40 FAQ
This 20 mm bore cylinder uses a 1/8" air port and generates 157 N push / 131.9 N pull at 0.5 MPa, 219.8 N push / 184.7 N pull at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
No, this specific SKU lacks the internal magnet so it cannot accept CMSG, DMSG or EMSG switches. You must select the -S variant for sensing. The 40 mm adjuster shortens the extend stroke, and the variable air cushion decelerates the piston but does not lock the load.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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