Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-75
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-75 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 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 MFCJ40X250-75
Dial in the extend end by up to 75 mm on site with the AirTAC MFCJ40X250-75, yielding a usable 175-250 mm forward stroke while retract remains full. This JIS-standard round-body mini cylinder pairs that external adjuster with a needle variable air cushion at both ends to soak up high-speed shock, running smoothly at 30-800 mm/s.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown, and the body is deliberately shorter than an ISO 6432 cylinder for the same bore and stroke, saving mounting length. Built for a 40 mm bore with a 1/4" port and M14x1.5 male rod thread, it delivers 628.3 N push and 527.8 N pull at 0.5 MPa. Because this SKU lacks the -S magnet, it cannot take a CMSG, DMSG or EMSG sensor.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-75 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-75 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MFCJ40X250-75
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | 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 MFCJ40X250-75 Is Used
High-Speed Diverters
Tune the 175-250 mm extend stroke on site to hit the diverter gate precisely, while the variable air cushion absorbs the shock of fast 628.3 N push movements.
Press Trial Fits
Dial in the exact end position during changeovers without machining spacers, letting the needle cushion softly decelerate the 40 mm bore at the end of the stroke.
Pallet Stopper Arms
Adjust the stopper arm length by up to 75 mm for varying pallet sizes; the shorter-than-ISO-6432 body saves valuable machine length on tight conveyors.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-75 the Right Cylinder?
When sizing this adjustable-stroke series, compare both bores directly: this MFCJ40 provides 628.3 N push at 0.5 MPa, whereas the MFCJ32 offers 402.2 N. Choose the 40 mm bore when moving heavier fixtures, and rely on the 75 mm adjust window for trial fits or high-speed changeovers where the exact end position and end-of-stroke shock both need tuning.
Remember that the air cushion only decelerates the piston near the end of travel—it is not a lock or brake. If your application must hold a vertical load on air loss, add an external rod lock or pilot-operated check valve, as the piston will drift. For mounting, use LB foot, FA flange or TC trunnion brackets (there is no SDB or back-cover option here).
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 MFCJ40X250-75 FAQ
This 40 mm bore cylinder features 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, 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 does not include the -S magnet, so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for position sensing; the external adjuster only shortens the extend end position and does not lock the piston mid-stroke.
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Standard models are processed and dispatched in 3-5 business days.
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