Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-30
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-30 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 MFCJ20X125-30
Dial in the exact extend length on-site with the AirTAC MFCJ20X125-30, a JIS-standard round-body mini cylinder featuring a 30 mm adjustable window. This double-acting actuator lets you shorten the extend end from the 125 mm maximum down to 95 mm, while the retract stroke remains full. A needle variable air cushion at both ends soaks up high-speed end-of-stroke shock for smooth, quiet motion.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown, and the compact riveted body is shorter than an ISO 6432 cylinder for the same 20 mm bore and stroke. Delivering 157 N of push force at 0.5 MPa via a 1/8" port, it provides a safe working load of about 94 N. Note this SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-30 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-30 |
|---|---|
| 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 MFCJ20X125-30
| 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 MFCJ20X125-30 Is Used
Light Part Ejection
Tune the 95-125 mm extend stroke and dial in the needle air cushion to softly eject light plastic components at high speed without bouncing them off the fixture.
Package Diverter
Adjust the extend end on the fly during product changeovers to deflect small cartons of varying widths, using the 157 N push force to pivot the guide arm reliably.
Lab Test Actuator
Set precise end positions for repetitive testing strokes in a compact lab setup, benefiting from the SUS304 stainless barrel that withstands occasional washdowns and mild chemicals.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-30 the Right Cylinder?
When sizing this 20 mm bore against the MFCJ25, compare the real thrust: the MFCJ20 yields 157 N push at 0.5 MPa, while the MFCJ25 steps up to 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where you need to trim the extend position by up to 30 mm and tune the end-of-stroke deceleration. The air cushion only decelerates the piston near the end of travel; it does not lock or hold the load. If your application must hold position on air loss, add an external rod lock or pilot-operated check valve.
Mounting options include LB foot, FA flange and TC trunnion; there is no SDB mount or back cover on this adjustable build. Because this specific model has no -S magnet, it cannot support magnetic sensing. If you need position feedback, select the -S variant to enable 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 MFCJ20X125-30 FAQ
This 20 mm bore cylinder uses a 1/8" port and an 8 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.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG or EMSG switches. You must choose the -S variant for position sensing. The external adjuster shortens the extend stroke by up to 30 mm, and the variable air cushion decelerates the piston at the ends but does not lock the load.
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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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