Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 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 MFCJ40X125-50S
Tune both travel and end-of-stroke shock on-site with this 40 mm bore adjustable-stroke mini cylinder. The external adjuster shortens the 125 mm extend stroke by up to 50 mm, while needle variable air cushions at both ends absorb high-speed impact for smooth, quiet motion. A built-in magnet (-S) enables CMSG, DMSG or EMSG switches for position sensing.
Built as a JIS-standard round-body unit with a SUS304 stainless barrel and riveted aluminium covers, it is shorter than an ISO 6432 cylinder for the same stroke, saving mounting length while resisting mild washdown corrosion. Operating at 0.15-1.0 MPa via a 1/4" port, it delivers 628.3 N push force at 0.5 MPa. For practical sizing, expect a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MFCJ40X125-50S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | 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 MFCJ40X125-50S Is Used
High-Speed Forming Press
Dial in the 125 mm extend stroke within the 50 mm window to set precise forming depth, while the variable air cushion decelerates the 628.3 N push force smoothly at 800 mm/s.
Package Divert Arm
Tune the extend end position on the fly during product changeovers. The needle cushion absorbs the shock of fast routing movements without needing mechanical bumpers.
Vertical Lift Gate
Lifts about 32 kg vertically using the 0.5 MPa push force. The SUS304 stainless barrel handles mildly humid warehouse air, and the -S magnet tracks gate position.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50S the Right Cylinder?
Choose between the two available bores based on your force needs. This MFCJ40 delivers 628.3 N push at 0.5 MPa, stepping up from the MFCJ32 at 402.2 N. If your changeover requires precise extend tuning and shock absorption at speed, the 50 mm adjuster window and variable air cushion excel in trial-fit stations. Note that the cushion only decelerates near stroke end; it is not a lock. To hold a load on air loss, add an external rod lock or pilot check valve. Mount via LB foot, FA flange or TC trunnion (no SDB), and use the -S magnet for CMSG/DMSG/EMSG sensors.
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 MFCJ40X125-50S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 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 50 mm from the 125 mm maximum, and the needle variable air cushion at both ends soaks up high-speed shock. The cushion only decelerates the piston near stroke end; it is not a brake. For load holding on air loss, install an external rod lock or pilot check valve. The -S magnet supports CMSG, DMSG and EMSG sensors.
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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