Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/4" 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.
- BoreØ40 mm
- Stroke25 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- 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 MFCJ40X25-20S
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ40X25-20S, a JIS-standard round-body mini cylinder. It features a SUS304 stainless barrel with riveted aluminium covers, yielding a shorter mounting envelope than an ISO 6432 unit of identical bore and stroke. The external adjuster shortens the extend stroke by up to 20 mm on-site, while the needle-variable air cushion at both ends ensures smooth deceleration. A built-in magnet (-S) enables CMSG, DMSG, or EMSG sensor integration.
Operating at 0.15-1.0 MPa with a 1/4" port and M14x1.5 male rod thread, this double-acting actuator delivers 628.3 N push force at 0.5 MPa. For sizing context, it offers a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin. It hits a theoretical maximum of 128.1 kgf at 1.0 MPa, making it a robust choice for demanding changeovers.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MFCJ40X25-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MFCJ40X25-20S Is Used
High-Speed Component Pressing
Leverage the 628.3 N push force to seat small bearings, using the 20 mm stroke adjuster to fine-tune the press depth without reprogramming the PLC.
Adjustable Diverter Gate
Control product flow on a packaging line by tuning the extend stroke on-site, while the variable air cushion absorbs the repetitive high-speed shock of routing boxes.
Vertical Lift Stops
Lift light fixtures up to 32 kg in a sorting hub; the -S magnet tracks the load position, while the cushion softens the upward stop at 800 mm/s.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20S the Right Cylinder?
When choosing between the two available bores, the MFCJ40 provides 628.3 N push at 0.5 MPa compared to the MFCJ32 at 402.2 N. Select this 40 mm bore when your trial fits or high-speed changeovers require that extra thrust alongside the 20 mm adjustable stroke window. The variable air cushion is essential for shock-sensitive setups, allowing you to tune end-of-stroke deceleration precisely.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover). Because this is an -S model, you can directly mount CMSG, DMSG, or EMSG switches for position feedback. Remember that the cushion only decelerates the piston; it does not act as a brake. If air loss occurs, the piston will drift, so install 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 MFCJ40X25-20S FAQ
This 40 mm bore cylinder features a 1/4" port and an M14x1.5 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on-site for precise positioning. The needle-variable air cushion at both ends decelerates the piston near the stroke ends to reduce shock at speeds up to 800 mm/s. The cushion only slows the piston; it does not lock or hold the load.
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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