Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50S 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 MFCJ20X125-50S
Dial in the extend end precisely on-site with the AirTAC MFCJ20X125-50S, a JIS-standard round-body mini cylinder offering a 50 mm adjustable stroke window. The external adjuster shortens the nominal 125 mm extend travel down to a 75 mm minimum, while the retract stroke remains full length. Built with a SUS304 stainless barrel and riveted aluminium covers, this double-acting actuator resists mild corrosion and washdown. Because the MF body is shorter than an ISO 6432 cylinder for the same bore and stroke, it saves valuable mounting length without conforming to that standard.
Driven by a 1/8" port and an Ø8 mm rod with an M8x1.25 male thread, the 20 mm bore generates 157 N of push force at 0.5 MPa. This yields a safe working load of about 94 N, or roughly 8 kg of vertical lift with a 2:1 margin. Needle-set variable air cushions at both ends soak up high-speed kinetic energy, and the -S suffix means a built-in piston magnet is present for CMSG, DMSG, or EMSG switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50S |
|---|---|
| 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 MFCJ20X125-50S
| 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 MFCJ20X125-50S Is Used
Lightweight Parts Ejection
Tune the extend stroke by up to 50 mm to strike small plastic parts cleanly. The variable air cushion decelerates the 157 N push force smoothly at high cycle rates.
Adjustable Transfer Diverter
Set the exact 75-125 mm extend position needed to route light cartons on a conveyor. The SUS304 stainless barrel handles occasional washdown during line cleaning.
Lab Automation Trial Fits
Dial in the extend end for delicate sensor placement. The compact JIS round body saves mounting length, while the -S magnet tracks position via DMSG switches.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50S the Right Cylinder?
Weigh the MFCJ20X125-50S against the next size up: this 20 mm bore pushes 157 N at 0.5 MPa, whereas an MFCJ25 delivers 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where shock-sensitive trial fits demand both a tunable 50 mm extend window and needle air cushions. Remember that the cushion only decelerates the piston near stroke end—it is not a lock or brake. If the application must hold a load on air loss, add an external rod lock or pilot-operated check valve.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code). The integrated -S magnet supports CMSG, DMSG, and EMSG reed or electronic sensors for position confirmation. Keep operating pressure between 0.15 and 1.0 MPa, and expect speeds of 30-800 mm/s.
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 MFCJ20X125-50S FAQ
This 20 mm bore cylinder uses a 1/8" port and an Ø8 mm rod. It generates 157 N push and 131.9 N pull at 0.5 MPa, or 219.8 N push and 184.7 N pull at 0.7 MPa. The theoretical maximum force is 32 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 50 mm on-site, giving a usable 75-125 mm extend window. Needle variable air cushions at both ends decelerate the piston near stroke end for smooth high-speed motion. The -S suffix provides a built-in magnet for CMSG, DMSG, or EMSG switches.
Authorized Export Seller
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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