Airtac MFJ Adjustable Mini Cylinder MFJ40X45-10S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X45-10S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
- 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 MFJ Adjustable Mini Cylinder MFJ40X45-10S
Trimming the extend position by up to 10 mm on site, this double-acting JIS-standard round-body mini cylinder saves you from buying a new unit for every minor dimensional tweak. The MFJ40X45-10S uses an external adjuster to shorten the 45 mm extend stroke down to a 35 mm minimum, while the retract stroke remains full length. Its riveted rolling-packed construction features a SUS304 stainless barrel and aluminium covers, delivering a body that is physically shorter than an ISO 6432 cylinder for the same bore and stroke.
In the 40 mm bore class, the Ø16 mm rod and 1/4" port deliver a robust 628.3 N push force at 0.5 MPa. This makes the unit a solid fit for moderate load positioning, offering a safe working load around 377 N or roughly 32 kg of vertical lift with a 2:1 margin. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing, and fixed TPU bumper pads absorb end-of-stroke impact without needing an adjustable air cushion.
Airtac MFJ Adjustable Mini Cylinder MFJ40X45-10S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X45-10S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | Fixed TPU bumper pads |
| 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 MFJ Adjustable Mini Cylinder MFJ40X45-10S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 MFJ Adjustable Mini Cylinder MFJ40X45-10S Is Used
Trial-Fit Assembly Rigs
Leverage the 628.3 N push force to seat components, then dial in the exact 35-45 mm extend position via the 10 mm adjuster during prototype runs.
Changeover Stations
Switch product variants quickly by repositioning the extend end on the fly, avoiding the downtime of physically swapping out cylinders.
Variable-Position Stops
Use the integrated magnet and CMSG sensors to confirm retraction, while relying on the external adjuster to set precise mechanical stops for 40 mm bore tooling.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X45-10S the Right Cylinder?
When sizing these adjustable units, compare the real force outputs: the MFJ40 gives 628.3 N push at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N. Choose the 40 mm bore if your trial-fit rig or changeover station needs to move heavier fixtures securely. The 10 mm adjuster window is especially useful during commissioning when the exact end position is unknown, letting you dial in the stroke mechanically without adding external stops.
For mounting, you can use LB foot, FA flange, or TC trunnion brackets (SDB is not available). Remember that the TPU bumpers only decelerate the stroke end; they do not lock the rod. If your application must hold a load vertically during air loss, add an external rod lock or pilot check valve. The -S magnet on this SKU enables CMSG/DMSG/EMSG sensors.
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 MFJ Adjustable Mini Cylinder MFJ40X45-10S FAQ
This 40 mm bore cylinder has a 1/4" port and a Ø16 mm rod. At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 10 mm on site, giving a usable 35-45 mm range. It only sets the end position and is not a mid-stroke lock. End-of-travel deceleration is handled by fixed TPU bumper pads, not an adjustable air cushion.
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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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