Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-40 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 MFCJ40X125-40
Tune extend travel on-site with the AirTAC MFCJ40X125-40, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. An external adjuster shortens the extend stroke by up to 40 mm (usable range 85-125 mm), while a needle-set variable air cushion at both ends absorbs high-speed shock for quiet motion.
Delivering 628.3 N push force at 0.5 MPa through a 1/4" port, this 40 mm bore unit handles robust loads. It yields a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin. Its riveted body is shorter than an ISO 6432 cylinder for the same stroke, saving mounting length without claiming compliance. Note this SKU lacks a magnet, so it cannot take CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-40 |
|---|---|
| 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 MFCJ40X125-40
| 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 MFCJ40X125-40 Is Used
High-Speed Carton Transfer
Dial in the 85-125 mm extend stop to push 30 kg cartons precisely onto a moving belt, using the variable air cushion to prevent end-of-stroke hammering at 800 mm/s.
Adjustable Tooling Strike
Fine-tune the forward thrust within the 40 mm window during machine changeovers, letting the needle cushion absorb the 879.6 N peak force at 0.7 MPa for delicate part forming.
Pallet Positioning Stop
Act as a heavy-duty physical stop for incoming pallets, shortening the stroke on-site to match pallet depth while the twin cushions decelerate the impact smoothly.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-40 the Right Cylinder?
When sizing, compare this MFCJ40 against the smaller MFCJ32. The 40 mm bore provides 628.3 N push at 0.5 MPa, whereas the MFCJ32 delivers 402.2 N. Choose the 40 mm bore when moving heavier masses, and rely on the 40 mm adjustable window plus twin air cushions for high-speed changeovers where exact end positions and shock absorption must be tuned independently.
Mount using LB foot, FA flange, or TC trunnion brackets (no SDB or back-cover options exist). Because this non-magnet SKU cannot accept position sensors, order an -S variant if you need CMSG/DMSG/EMSG switches. Finally, the air cushion only decelerates near stroke end—it is not a lock; for suspended loads, install an external rod lock or pilot check valve to prevent drift 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 MFCJ40X125-40 FAQ
This 40 mm bore cylinder features a 1/4" port, a Ø16 mm piston rod, and an M14x1.5 male rod 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 of 128.1 kgf at 1.0 MPa. The 125 mm base stroke is non-standard compliant but falls within the 500 mm maximum limit.
The external adjuster shortens the extend stroke by up to 40 mm on-site (usable range 85-125 mm), and the needle variable air cushion at both ends decelerates the piston near stroke end for high-speed cycles. This specific SKU lacks a magnet, so it cannot accept CMSG/DMSG/EMSG sensors; order the -S variant for position sensing.
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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.
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Most inquiries answered within 7-8 hours.
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