Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50 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 MFCJ40X125-50
Tune both travel and end-of-stroke shock on site with this double-acting, adjustable-stroke mini cylinder. A 50 mm external adjuster shortens the extend stroke from a 125 mm nominal maximum, while needle variable air cushions at both ends absorb high-speed impact.
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 envelope. The 40 mm bore uses a 1/4" port and M14x1.5 male rod thread, pushing 628.3 N at 0.5 MPa. This yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin. Note this SKU lacks a magnet, so it cannot take CMSG/DMSG/EMSG switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50 |
|---|---|
| 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 MFCJ40X125-50
| 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 MFCJ40X125-50 Is Used
High-Speed Diverters
Dial in the 50 mm stroke window to set exact pusher extension, letting the variable air cushion absorb shock during rapid package diverting at up to 800 mm/s.
Press Fit Tuning
Leverage the 628.3 N push force to seat components, adjusting the extend end precisely to avoid over-travel while the cushion softens the impact.
Pallet Stops
Halt heavy pallets smoothly using the needle cushion, tweaking the stop position on the fly to handle varying load sizes without changing hardware.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-50 the Right Cylinder?
Choose MFCJ40 over MFCJ32 when you need heavy push force: the 40 mm bore delivers 628.3 N at 0.5 MPa versus 402.2 N for the 32 mm. The 50 mm adjustable window is ideal for high-speed changeovers where the exact extend position and deceleration must be dialed in during trial fits.
Mount via LB foot, FA flange, or TC trunnion (no SDB). Because this is a non-magnet SKU, position sensing is unavailable. Remember the air cushion only decelerates near stroke end; it is not a lock. Use an external rod lock or pilot check valve to hold loads on air loss.
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 MFCJ40X125-50 FAQ
The 40 mm bore has a 1/4" port. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 50 mm on site, while the needle variable air cushion decelerates the piston near stroke end. This specific SKU lacks the -S magnet, so it cannot take CMSG/DMSG/EMSG switches.
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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