Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20
Trimming the extend stroke by up to 20 mm on-site, the AirTAC MFJ40X75-20 lets you dial in the exact end position without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter mounting envelope than an equivalent ISO 6432 unit while resisting mild washdown.
Fitted with a 16 mm rod and a 1/4" port, this double-acting 40 mm bore delivers 628.3 N of push force at 0.5 MPa. That translates to a safe working load of roughly 377 N, or lifting about 32 kg vertically with a 2:1 margin. This non-magnet SKU cannot take a sensor; add the -S version if you need CMSG, DMSG or EMSG switches.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 MFJ40X75-20
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MFJ40X75-20 Is Used
Changeover Stations
Dial in the 55-75 mm extend position on the fly during product changeovers, using the 628.3 N thrust to push parts firmly into place.
Trial-Fit Rigs
Perfect for prototype lines where the final stop is unknown, letting you shorten the stroke by 20 mm without swapping hardware.
Variable-Position Stops
Acts as an adjustable hard stop for medium loads up to 377 N, fine-tuning the extend end without external mechanical collars.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20 the Right Cylinder?
When sizing between the two available bores, the 40 mm option here yields 628.3 N of push at 0.5 MPa, whereas the MFJ32 provides 402.2 N. Choose this 40 mm bore if your trial-fit rig or changeover station needs that extra thrust, and rely on the 20 mm adjuster window to perfect the 55-75 mm extend length during commissioning.
For mounting, you can use LB foot, FA flange, or TC trunnion brackets (there is no SDB or back-cover option). Remember that the fixed TPU bumpers only decelerate the stroke end; they do not lock the rod. If your setup must hold a load on air loss, install an external rod lock or pilot check valve.
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 MFJ40X75-20 FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 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.
An external adjuster shortens the extend stroke by up to 20 mm on-site, giving a usable 55-75 mm range. Fixed TPU bumpers decelerate the stroke end but do not act as a lock; the piston drifts on air loss, so use an external rod lock for holding. Also, this non-S SKU cannot take a sensor.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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