Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-30S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-30S 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 MFCJ40X125-30S
Trimming the extend end by up to 30 mm on-site, this double-acting JIS-standard round-body mini cylinder lets you dial in a 95-125 mm stroke while a needle variable air cushion at both ends soaks up high-speed shock. The SUS304 stainless barrel and riveted aluminium covers yield a shorter mounting envelope than an ISO 6432 unit, resisting mild washdown.
In the 40 mm bore class, this unit delivers 628.3 N of push force at 0.5 MPa through a 1/4" port, peaking at a theoretical 128.1 kgf. The built-in -S magnet enables CMSG, DMSG or EMSG sensors for position confirmation. For sizing, it safely moves a 377 N load or lifts about 32 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-30S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-30S |
|---|---|
| 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 MFCJ40X125-30S
| 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 MFCJ40X125-30S Is Used
High-Speed Forming Press
Dial in the 95-125 mm extend precisely during tooling changeovers, relying on the variable air cushion to absorb the 879.6 N impact force at 0.7 MPa operating pressure.
Package Divert Arm
Adjust the stroke by up to 30 mm on-site to accommodate varying box sizes, using the 1/4" port air pressure to push packages smoothly without end-of-stroke slamming.
Pallet Lift Stopper
Lift or stop loads up to 32 kg vertically with a 2:1 safety margin, confirming position via the -S magnet and CMSG switches while the cushion ensures quiet deceleration.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X125-30S the Right Cylinder?
When choosing between the two bores, the MFCJ40 provides 628.3 N push at 0.5 MPa versus the MFCJ32 at 402.2 N—pick the 40 mm bore if your changeover demands pushing heavier fixtures. The 30 mm adjustable window is perfect for trial fits where the exact extend position is unknown, while the dual variable air cushions handle the 30-800 mm/s speed range smoothly.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Remember that the air cushion only decelerates the piston near stroke end; it does not act as a brake. If air pressure drops, the load will drift—install an external rod lock or pilot check valve for position holding.
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 MFCJ40X125-30S FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod. 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 external adjuster shortens the extend stroke by up to 30 mm (usable range 95-125 mm), while the needle variable air cushion at both ends decelerates the piston near stroke end. The -S magnet allows CMSG/DMSG/EMSG sensors to be installed, but the cushion does not lock or hold the load on air loss.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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