Airtac MFCJ Adjustable Mini Cylinder MFCJ25X50-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X50-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø25mm bore and 50mm 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.
- BoreØ25 mm
- Stroke50 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM10×1.25
- 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 MFCJ25X50-20S
Dial in exact extend positions and absorb end-of-stroke shock with the AirTAC MFCJ25X50-20S, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 20 mm on site, while a needle variable air cushion at both ends ensures smooth deceleration at high speeds up to 800 mm/s. Because it is a double-acting actuator with a 1/8" port and a 10 mm rod, it delivers a 245.3 N push force at 0.5 MPa.
This adjustable-stroke design is perfect for trial fits and changeovers where both the end position and shock absorption need tuning. The body is physically shorter than an ISO 6432 cylinder for the same 50 mm stroke, saving mounting length. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing. For a safe working load, expect roughly 147 N (about 60% of the 0.5 MPa push figure), lifting around 12.5 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X50-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X50-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 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 MFCJ25X50-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×50 | 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 MFCJ25X50-20S Is Used
Adjustable Tooling Stops
Fine-tune the extend stroke by up to 20 mm during machine changeovers, using the 245.3 N push force to position light tooling blocks accurately without swapping hard stops.
High-Speed Diverters
Leverage the variable air cushion to decelerate the 10 mm rod smoothly at high cycle rates, preventing impact damage when sorting small packages on a conveyor line.
Lab Test Rigs
Perfect for trial fits where the exact 30-50 mm extend position and end-of-stroke shock both require on-site tuning, while the SUS304 barrel resists mild washdown.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X50-20S the Right Cylinder?
When sizing this actuator, compare the real thrust outputs: the 25 mm bore provides 245.3 N push at 0.5 MPa, sitting neatly between the MFCJ20 at 157 N and the MFCJ32 at 402.2 N. Choose this 25 mm option when you need moderate force plus the flexibility to trim the extend stroke by up to 20 mm and fine-tune the needle air cushion for high-speed, shock-sensitive changeovers. Mounting options include LB foot, FA flange and TC trunnion (no SDB), and the -S magnet enables CMSG/DMSG/EMSG sensors.
Remember that the air cushion only decelerates the piston near the end of stroke; it is not a brake. If air loss occurs, the piston will drift because a plain cylinder does not hold position. For suspended or vertical loads that must remain fixed during a pressure drop, install an external rod lock or a pilot-operated check valve.
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 MFCJ25X50-20S FAQ
This double-acting cylinder features a 1/8" port and delivers a push force of 245.3 N and a pull force of 206.1 N at 0.5 MPa. At 0.7 MPa, the push is 343.4 N and the pull is 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm within a 30-50 mm usable window, and the needle variable air cushion decelerates the piston at both ends for smooth high-speed motion. The cushion is not a lock or brake; the cylinder cannot hold a load on air loss, so use an external rod lock for suspended loads. The -S suffix means it has a magnet for CMSG, DMSG or EMSG sensors.
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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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