Airtac MFJ Adjustable Mini Cylinder MFJ40X75-30
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-30 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 MFJ40X75-30
Trimming the extend stroke by up to 30 mm on site, this double-acting AirTAC MFJ40X75-30 mini cylinder lets you dial in the exact end position without buying a new unit. The external adjuster brings the usable extend down to 45 mm from its 75 mm maximum, while the retract stroke remains full. It is a JIS-standard round-body build with a SUS304 stainless barrel and riveted aluminium covers, engineered to be shorter than an ISO 6432 cylinder for the same bore and stroke to save mounting length.
In the 40 mm bore class, it delivers a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa. This translates to a safe working load of about 377 N, or lifting roughly 32 kg vertically with a 2:1 safety margin. The 1/4" port and M14x1.5 male rod thread handle flows up to an 879.6 N push at 0.7 MPa. Note this specific SKU lacks a magnet, so it cannot accept CMSG/DMSG/EMSG sensors without switching to the -S variant.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-30 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-30 |
|---|---|
| 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 MFJ40X75-30
| 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 MFJ40X75-30 Is Used
Changeover Stations
Fine-tune the extend position by up to 30 mm during product line changeovers, accommodating varying part sizes without swapping cylinders.
Trial Fit Rigs
Ideal for prototype testing where the exact 75 mm stroke needs on-site shortening to find the optimal end position for a 628.3 N push operation.
Variable-Position Stops
Acts as a compact, shorter-than-ISO-6432 stop cylinder in tight machinery, letting operators dial in the stroke end precisely for different workpieces.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-30 the Right Cylinder?
When sizing between the two available bores, the MFJ40 provides 628.3 N of push at 0.5 MPa compared to the 402.2 N of the MFJ32, making this 40 mm bore the better choice when your load approaches 38 kg. The 30 mm adjustable window is invaluable for changeover stations or trial fits where the exact extend position is not yet finalised. Just remember the adjuster only shortens the extend end; it does not act as a mid-stroke lock.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code). Because this is a non-magnet SKU, it cannot host a sensor. Also, the fixed TPU bumper pads only decelerate the stroke end; they do not hold the load on air loss. For a suspended load, 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 MFJ40X75-30 FAQ
This 40 mm bore cylinder features a 1/4" port and an M14x1.5 male rod thread. At 0.5 MPa it provides 628.3 N of push force and 527.8 N of pull force. At 0.7 MPa the push increases to 879.6 N and pull to 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 30 mm on site, but it is not a mid-stroke lock. Fixed TPU bumper pads decelerate the stroke end but do not hold the load on air loss; use an external rod lock for that. Also, this specific SKU has no magnet, so it cannot accept CMSG/DMSG/EMSG switches without upgrading to the -S variant.
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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