Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20S 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 MFCJ20X125-20S
Dial in exact extend positions on-site with the AirTAC MFCJ20X125-20S, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. The external adjuster shortens the nominal 125 mm extend stroke by up to 20 mm, while needle variable air cushions at both ends soak up high-speed end-of-stroke shock. Because it lacks a back cover, the body is shorter than an equivalent ISO 6432 cylinder, saving valuable mounting length.
Driven by a 1/8" port and an Ø8 mm rod, this double-acting actuator delivers 157 N of push force at 0.5 MPa. That translates to a safe working load of roughly 94 N, letting you lift about 8 kg vertically with a 2:1 safety margin. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20S |
|---|---|
| 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 MFCJ20X125-20S
| 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 MFCJ20X125-20S Is Used
Lightweight Component Pressing
Tune the 20 mm extend window to press small bearings or pins precisely, relying on the variable air cushion to absorb the roughly 94 N working load impact at high speed.
Package Diverting Stops
Adjust the stopper stroke on the fly for varying carton sizes; the 8 kg vertical lift capacity easily halts light boxes without slamming.
Lab Automation Trial Fits
Perfect for R&D fixtures needing iterative stroke tweaks up to 125 mm, where the SUS304 barrel resists mild washdown and the compact JIS body fits tight enclosures.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-20S the Right Cylinder?
When sizing this 20 mm bore against the MFCJ25, compare the actual thrust: the MFCJ20 provides 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 shock-sensitive trial fits demand both an adjustable end position and a tuned cushion. Mounting options include LB foot, FA flange and TC trunnion (no SDB). Note that the air cushion and adjuster only decelerate and set position; they do not lock. The piston will drift on air loss, so fit an external rod lock or pilot check valve for suspended loads.
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 MFCJ20X125-20S FAQ
This 20 mm bore cylinder features 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 maximum of 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on-site, giving a usable range of 105-125 mm, while the retract stroke remains full. Needle variable air cushions at both ends decelerate the piston smoothly at speeds up to 800 mm/s. The -S suffix means a magnet is built in for CMSG, DMSG or EMSG sensors.
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1-Year Warranty
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Standard models usually ship in 3-4 days.
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