Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-50S 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 MFCJ20X250-50S
Trim the extend stroke by up to 50 mm on-site with this double-acting, variable-cushion mini cylinder, allowing a usable 200-250 mm forward travel. The JIS-standard round-body construction features a SUS304 stainless barrel and riveted aluminium covers, measuring shorter than an ISO 6432 cylinder for the same bore and stroke to save valuable mounting length.
Delivering 157 N of push force at 0.5 MPa through a 1/8" port, it provides a safe working load of roughly 94 N and lifts about 8 kg vertically with a 2:1 margin. Needle air cushions at both ends soak up high-speed end-of-stroke shock, and the built-in -S magnet supports CMSG, DMSG, or EMSG switches for position sensing.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-50S |
|---|---|
| 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 MFCJ20X250-50S
| 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 MFCJ20X250-50S Is Used
Light-Part Ejection
Dial in the 200-250 mm extend stroke to eject small plastic parts precisely, relying on the needle cushion to halt the 8 kg payload smoothly at high speed.
Transfer Diverting
Tune the extend stop on-site to deflect lightweight cartons between conveyor lanes without smashing the end cap during rapid changeovers.
Lab Automation
Perfect for trial-fit mechanisms where the exact 50 mm stroke window and end-of-stroke deceleration must be tweaked repeatedly for delicate testing fixtures.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-50S the Right Cylinder?
Weigh this 20 mm bore against the MFCJ25, which steps up to 245.3 N of push force at 0.5 MPa compared to the 157 N offered here. Choose the 20 mm when your payload is light and space is tight; select the 25 mm if you need extra thrust for heavier sliding or lifting tasks. Both feature the 50 mm adjustable window and variable air cushion for tuning high-speed changeovers and shock-sensitive trial fits.
Remember that the external adjuster only sets the extend end position—it is not a mid-stroke lock. The cylinder will drift and cannot hold a load on air loss, so add an external rod lock or pilot-operated check valve for suspended loads. Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount on this build).
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 MFCJ20X250-50S FAQ
This 20 mm bore cylinder uses a 1/8" port and an Ø8 mm rod with an M8x1.25 male thread. It generates 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N push and 184.7 N pull at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm (usable range 200-250 mm), while retract remains full. Variable needle air cushions at both ends decelerate the piston near stroke end to absorb high-speed shock. The -S magnet enables CMSG/DMSG/EMSG sensors, but note the cushion is not a brake and will not hold a load on air loss.
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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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