Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20 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
- 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 MFCJ20X125-20
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ20X125-20 adjustable-stroke mini cylinder. This JIS-standard round-body actuator uses an external adjuster to shorten the extend stroke by up to 20 mm on-site (usable extend 105-125 mm), while a needle variable air cushion at both ends soaks up end-of-stroke impact. Built with a SUS304 stainless barrel and riveted aluminium covers, it is shorter than an ISO 6432 cylinder for the same 20 mm bore and 125 mm stroke, saving valuable mounting length.
Delivering 157 N push and 131.9 N pull at 0.5 MPa (219.8 N push at 0.7 MPa), it handles light positioning tasks with a safe working load around 94 N. The 1/8" port and M8x1.25 male rod thread simplify integration. Note this SKU lacks the -S magnet, so it cannot accept CMSG/DMSG/EMSG position switches. The cushion decelerates the load but does not lock it; for holding position on air loss, add an external rod lock or pilot check valve.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20 |
|---|---|
| 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 MFCJ20X125-20
| 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 MFCJ20X125-20 Is Used
Light Part Ejection
Tunes the 20 mm extend window to dial in exact ejection of small plastic parts at high speed, using the variable air cushion to prevent bounce.
Package Diverting
Adjusts the stroke on-site for varying box sizes on a conveyor line, absorbing the shock of rapid diverting moves with a 94 N safe working load.
Lab Automation Trial Fits
Ideal for prototype changeovers where the exact 105-125 mm extend position and end-stop deceleration must be tweaked without swapping cylinders.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20 the Right Cylinder?
Choose the MFCJ20X125-20 for trial fits and high-speed changeovers where both the extend end-point and the end-of-stroke shock need field tuning. With a 157 N push force at 0.5 MPa, it lifts about 8 kg vertically with a 2:1 margin. If your application needs more thrust, step up to the MFCJ25 which provides 245.3 N at 0.5 MPa. Both options offer the same 30-800 mm/s speed range and variable air cushioning.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount). Because this specific SKU has no -S magnet, it cannot support magnetic sensing; if you need position feedback, select the -S variant to enable CMSG/DMSG/EMSG switches. Remember the air cushion only decelerates near stroke end—it is never a brake.
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 MFCJ20X125-20 FAQ
This 20 mm bore cylinder has a 1/8" port and M8x1.25 male rod 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 max of 32 kgf at 1.0 MPa. The variable air cushion supports speeds of 30-800 mm/s.
No, this specific SKU does not include the -S magnet, so it cannot accept CMSG/DMSG/EMSG switches. The external adjuster shortens the extend stroke by up to 20 mm but does not lock the piston mid-stroke; the air cushion only decelerates the load near the ends.
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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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