Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 250mm 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
- Stroke250 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 MFCJ20X250-40S
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ20X250-40S. This JIS-standard round-body mini cylinder features a 40 mm external adjuster that shortens the extend stroke on-site (usable range 210-250 mm), paired with needle-set variable air cushions at both ends for smooth deceleration.
Built with a SUS304 stainless barrel and riveted aluminium covers, the body is deliberately shorter than an ISO 6432 unit of the same bore and stroke, saving valuable mounting length. The 20 mm bore delivers 157 N of push force at 0.5 MPa (131.9 N pull), yielding a safe working load around 94 N or roughly 8 kg of vertical lift with a 2:1 margin. A 1/8" port and built-in magnet (-S) enable CMSG, DMSG or EMSG sensors for position feedback.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 250 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 MFCJ20X250-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×250 | 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 MFCJ20X250-40S Is Used
Adjustable Tooling Stops
Fine-tune the extend stroke up to 40 mm during machine changeovers to accommodate different part lengths without swapping cylinders.
High-Speed Diverter Arms
Leverage the 157 N push force to deflect light packages on a conveyor, relying on the variable air cushion to prevent end-of-stroke slamming at high speeds.
Lab Test Actuators
Perfect for trial-fit rigs where the exact 210-250 mm extend position and deceleration rate both need iterative tuning to protect delicate samples.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X250-40S the Right Cylinder?
Choose the MFCJ20X250-40S when your application demands both on-site stroke tuning and end-of-stroke shock absorption, such as high-speed changeovers or shock-sensitive trial fits. The 20 mm bore provides 157 N push at 0.5 MPa; if you need more force, stepping up to the MFCJ25 offers 245.3 N at the same pressure. Remember that the air cushion only decelerates the piston near the end of travel—it does not lock or hold the load. If air pressure drops, the piston will drift, so fit an external rod lock or pilot check valve for suspended loads. Mounting options include LB foot, FA flange, and TC trunnion (no SDB).
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 MFCJ20X250-40S FAQ
This 20 mm bore cylinder uses a 1/8" air port and an M8x1.25 male rod thread. It generates 157 N push / 131.9 N pull at 0.5 MPa, 219.8 N push / 184.7 N pull at 0.7 MPa, and a theoretical maximum of 32 kgf at 1.0 MPa.
Yes, the -S suffix indicates a built-in piston magnet compatible with CMSG, DMSG, and EMSG switches. The external adjuster shortens the extend stroke by up to 40 mm on-site (usable range 210-250 mm), while the variable air cushion at both ends is needle-adjustable to decelerate the load smoothly.
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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