Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-75S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-75S 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 MFCJ40X125-75S
Tune both the extend end-point and the end-of-stroke deceleration on-site with this 40 mm bore adjustable-stroke cylinder. The external adjuster shortens the extend stroke by up to 75 mm (usable 50-125 mm), while the needle variable air cushion at both ends soaks up high-speed shock for smooth, quiet motion. A built-in piston magnet (-S) enables CMSG, DMSG or EMSG electronic or reed switches for position sensing.
Built as a JIS-standard round-body mini with a SUS304 stainless barrel and riveted aluminium covers, the body is intentionally shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. Delivering 628.3 N push force at 0.5 MPa (879.6 N at 0.7 MPa) through a 1/4" port and M14x1.5 male rod thread, it provides a safe working load of about 377 N or lifts roughly 32 kg vertically with a 2:1 margin. The SUS304 construction resists mild corrosion and washdown environments.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-75S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-75S |
|---|---|
| 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 MFCJ40X125-75S
| 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 MFCJ40X125-75S Is Used
High-Speed Machining Clamps
Dial in the exact 50-125 mm clamp extension and tune the needle air cushion to prevent shock when securing heavy fixtures at high cycling speeds.
Package Diverters
Adjust the pusher stroke on the fly for varying carton sizes while relying on the 628.3 N push force to redirect loads smoothly without end-impact.
Vertical Lift Stops
Lift up to 32 kg vertically with a 2:1 safety margin, using the external adjuster to set precise stopping heights for different pallet tiers.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-75S the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need heavier push force: the 40 mm bore yields 628.3 N at 0.5 MPa compared to 402.2 N for the 32 mm bore. This adjustable-stroke, variable-cushion design is ideal for high-speed changeovers or shock-sensitive trial fits where both the exact extend end-point and the deceleration rate must be tuned on the machine. The 1/4" port and 30-800 mm/s speed range handle rapid cycling.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code). The -S magnet on this SKU allows direct mounting of CMSG/DMSG/EMSG sensors. Remember that the air cushion only decelerates the piston near the stroke end—it is not a lock or brake. If the application requires the load to be held on air loss or a centred valve, install an external rod lock or pilot-operated check valve, as the piston will drift.
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 MFCJ40X125-75S 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 75 mm on-site (usable range 50-125 mm), while the needle variable air cushion at both ends decelerates the piston to absorb high-speed shock. The -S suffix means it has a built-in magnet for CMSG, DMSG or EMSG sensors. The cushion only decelerates near the end; 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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