Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20 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 MFCJ40X25-20
Dial in exact end positions on-site with the AirTAC MFCJ40X25-20, a JIS-standard round-body mini cylinder built for high-speed changeovers. An external adjuster shortens the extend stroke by up to a 20 mm window (yielding a usable 5-25 mm extend), while needle valves set a variable air cushion at both ends to soak up shock. The riveted SUS304 stainless barrel and aluminium covers resist mild washdown, and the body is shorter than a comparable ISO 6432 unit, saving valuable mounting length.
Delivering 628.3 N of push force at 0.5 MPa (879.6 N at 0.7 MPa) through a 16 mm rod and 1/4" port, this double-acting actuator handles serious work. The computed safe working load is roughly 377 N, meaning it lifts about 32 kg vertically with a 2:1 safety margin. Note this SKU lacks the -S magnet, so it cannot accept CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20 |
|---|---|
| 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 MFCJ40X25-20
| 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 MFCJ40X25-20 Is Used
High-Speed Parts Ejection
Uses the 20 mm stroke adjuster to dial in the exact ejector pin position, while the variable air cushion absorbs the 879.6 N push force impact at 800 mm/s cycle rates.
Package Diverting Arms
Tunes the extend endpoint on-site during conveyor changeovers; the 628.3 N thrust at 0.5 MPa easily pushes cartons without slamming, thanks to the dual needle cushions.
Pallet Stopper Gates
Shorter than an ISO 6432 cylinder, this 40 mm bore actuator fits tight pallet lines and safely stops loads up to 32 kg vertically when guided by an external check valve.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X25-20 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—pick the 40 mm bore if moving heavier platens or overcoming high friction. This adjustable-stroke, variable-cushion design is ideal for trial fits and high-speed changeovers where both the exact extend endpoint and end-of-stroke shock need field tuning. Mount via LB foot, FA flange, or TC trunnion (there is no SDB or back-cover option here).
Remember that the air cushion only decelerates the piston near stroke end; it does not lock or hold the load. If air pressure drops, the piston drifts, so fit an external rod lock or pilot check valve for suspended loads. Also, because this specific SKU has no -S magnet, position sensing is unavailable unless you switch to the magnet-equipped variant.
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 MFCJ40X25-20 FAQ
This 40 mm bore cylinder features a 1/4" port, a 16 mm rod, and a male M14x1.5 thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum force of 128.1 kgf at 1.0 MPa.
No, this specific SKU lacks the -S magnet option, so it cannot accept CMSG, DMSG, or EMSG switches. The external adjuster shortens the extend stroke by up to 20 mm, and the variable air cushion only decelerates the piston near the end—it does not lock the load in place.
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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