Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-30
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-30 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 MFCJ20X250-30
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ20X250-30. This double-acting JIS-standard round-body mini cylinder features a 30mm external adjuster that shortens the 250mm extend stroke on-site, while needle variable air cushions at both ends soak up end-of-stroke impact. Its SUS304 stainless barrel and riveted aluminium covers resist mild corrosion and washdowns, and the body is shorter than a comparable ISO 6432 unit to save mounting space.
Equipped with a 1/8" port and an Ø8mm rod, this 20mm bore generates 157N of push force at 0.5MPa. That yields a safe working load of roughly 94N, or about 8kg of vertical lift with a 2:1 margin. Note this SKU lacks a magnet, so it cannot accept CMSG/DMSG/EMSG switches; choose the -S variant for position sensing.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-30 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-30 |
|---|---|
| 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 MFCJ20X250-30
| 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 MFCJ20X250-30 Is Used
Conveyor Diverter Tuning
Fine-tune the 250mm extend stroke by up to 30mm on-site to hit moving targets precisely on a packaging line, while the variable air cushion prevents harsh impacts at 800mm/s.
Lab Automation Trial Fits
Ideal for shock-sensitive test rigs where the exact extend position and end-of-stroke deceleration both need iterative adjustment without re-engineering the fixture.
Light Press Assembly
Delivers a safe working load of about 94N for pressing small components, with needle cushions absorbing the kinetic energy to protect delicate parts during high-speed cycling.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-30 the Right Cylinder?
When sizing this 20mm bore, compare it directly to the MFCJ25, which delivers 245.3N of push at 0.5MPa versus the 157N here. Choose this MFCJ20 if your high-speed changeover or shock-sensitive trial fit requires lighter forces and a compact footprint. The 30mm adjustable window is ideal for fine-tuning the extend end without machining spacers.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover). Remember that the air cushion only decelerates the piston near stroke end—it is not a lock. If the load must be held on air loss, install an external rod lock or pilot check valve. Because this specific code has no -S magnet, it cannot support magnetic sensors.
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 MFCJ20X250-30 FAQ
This 20mm bore cylinder uses a 1/8" port and an Ø8mm rod. It generates 157N push and 131.9N pull at 0.5MPa, 219.8N push and 184.7N pull at 0.7MPa, with a theoretical max of 32kgf at 1.0MPa.
No, this specific SKU lacks the -S magnet, so it cannot accept CMSG/DMSG/EMSG switches. The external adjuster only shortens the extend stroke by up to 30mm, and the variable air cushion only decelerates the piston; neither holds the load on air loss, so use an external rod lock for holding.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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