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
- 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 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.
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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