Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm 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
- Stroke125 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- CushionVariable air cushion, both ends
About the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ20X125-10S, a JIS-standard round-body mini cylinder. An external adjuster shortens the extend stroke by up to 10 mm on-site (usable extend 115-125 mm), while a needle variable air cushion at both ends soaks up end-of-stroke impact. The riveted SUS304 stainless barrel with aluminium covers resists mild corrosion and washdown, and the body is shorter than an ISO 6432 cylinder for the same 20 mm bore and 125 mm stroke, saving valuable mounting length.
Driven by a 1/8" port and an Ø8 mm rod with an M8x1.25 male thread, this double-acting actuator delivers 157 N push and 131.9 N pull at 0.5 MPa. That translates to a safe working load of about 94 N, or roughly 8 kg of vertical lift with a 2:1 margin. The -S suffix means a built-in piston magnet is present, ready for CMSG, DMSG, or EMSG reed or electronic switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MFCJ20X125-10S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | 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 MFCJ20X125-10S Is Used
Light-Part Trial Fits
Use the 10 mm extend adjuster to micro-position a 94 N pick-and-place jaw during prototype changeovers without machining new stops.
High-Speed Diverting
Variable air cushions absorb the shock of rapid 125 mm strokes when deflecting light pouches on a 1/8" ported pneumatic gate.
Lab Test Actuators
The SUS304 barrel withstands washdown, while the adjustable stroke lets you tune the extend endpoint for delicate sensor cycling under 8 kg.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-10S the Right Cylinder?
Choose the MFCJ20 when your application needs roughly 94 N of safe working force; if you need more push, the MFCJ25 provides 245.3 N at 0.5 MPa. This 20 mm bore is ideal for trial fits and high-speed changeovers where both the exact extend endpoint and the end-of-stroke shock need field tuning. Because the adjuster only sets the end position and the cushion only decelerates, the piston will drift on air loss—specify an external rod lock or pilot-operated check valve if you must hold a suspended load.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code applies here). Sensors mount directly thanks to the -S magnet; a SKU without S cannot take a sensor.
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 MFCJ20X125-10S FAQ
This 20 mm bore cylinder has a 1/8" port and an Ø8 mm rod. 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 max of 32 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 10 mm (115-125 mm usable), and the needle variable air cushion decelerates the piston at both ends. It does not lock or hold position on air loss; for holding, use an external rod lock. The -S suffix enables CMSG/DMSG/EMSG sensors.
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