Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50S 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 MFJ40X75-50S
Trimming the extend end by up to 50 mm on site, this double-acting JIS-standard round-body mini cylinder lets you finalize a 25 to 75 mm stroke window without swapping hardware. The SUS304 stainless barrel and riveted aluminium covers yield a shorter overall length than an ISO 6432 unit of the same bore, while resisting mild washdown.
In the 40 mm bore class, it delivers 628.3 N of push force at 0.5 MPa (527.8 N pull), peaking at a 128.1 kgf theoretical maximum at 1.0 MPa. The built-in -S magnet enables CMSG, DMSG or EMSG switches, and the 1/4" port matches the Ø16 mm rod. With a safe working load near 377 N, it lifts about 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50S |
|---|---|
| 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 MFJ40X75-50S
| 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 MFJ40X75-50S Is Used
Changeover Stations
Dial in the exact extend position during format changes, using the 50 mm window to adapt the 628.3 N push force to varying part sizes without swapping cylinders.
Trial Fit Rigs
Perfect for prototype testing where the final stroke is unknown, letting technicians shorten the 75 mm extend on the fly until the kinematics are proven.
Variable Position Stops
Acts as an adjustable hard stop for light press operations, safely lifting around 32 kg vertically while the external adjuster sets the precise contact point.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50S the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need more muscle: this 40 mm bore pushes 628.3 N at 0.5 MPa, compared to 402.2 N for the 32 mm variant. The 50 mm external adjuster is ideal for trial fits and line changeovers where the exact end position is unknown, saving you from buying multiple cylinders or adding external stops.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover here). Remember that fixed TPU bumper pads only decelerate the stroke end; they do not lock. If the load must be held 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 MFJ40X75-50S FAQ
This 40 mm bore cylinder uses a 1/4" port and a Ø16 mm rod with an M14x1.5 male thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm, giving a usable 25-75 mm window, while retract remains full. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG sensors. Fixed TPU bumpers decelerate the ends, but the cylinder will drift 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.
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Most inquiries answered within 7-8 hours.
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