Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20S 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 MFJ40X75-20S
Trimming the extend stroke by up to 20 mm on site, the MFJ40X75-20S lets you dial in the exact end position between 55 and 75 mm without buying a new cylinder. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, delivering a compact footprint that is shorter than an ISO 6432 unit for the same bore and stroke.
Driven by a 16 mm rod and a 1/4" port, the 40 mm bore generates 628.3 N of push force at 0.5 MPa. With a safe working load around 377 N, it lifts about 32 kg vertically with a 2:1 margin. The -S suffix adds a piston magnet for CMSG, DMSG or EMSG switches, while fixed TPU bumpers absorb end impacts.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20S |
|---|---|
| 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 MFJ40X75-20S
| 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 MFJ40X75-20S Is Used
Changeover Stations
Fine-tune the extend position up to 20 mm during product format changes, using the 628.3 N push force to shift heavy guide rails without external stops.
Prototype Set-up Rigs
Dial in the exact 55 to 75 mm extend length during trial assemblies, relying on the 377 N safe working load to test new clamping pressures.
Variable Position Stops
Adjust the end-of-stroke contact point on the fly for delicate pressing tasks, letting the SUS304 barrel withstand mild washdown environments.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-20S the Right Cylinder?
When sizing this series, compare the real thrust: the 40 mm bore yields 628.3 N push at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N. Choose the 40 mm bore when moving heavier jigs or defeating higher friction. The adjustable extend is ideal for trial fits and line changeovers where the final stop position is unknown, saving you from swapping hardware.
Mounting options include LB foot, FA flange and TC trunnion, with no SDB or back-cover option. Because the fixed bumpers only decelerate the stroke end and the piston drifts on air loss, fit an external rod lock or pilot check valve if you need to hold a suspended load.
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 MFJ40X75-20S FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and an M14x1.5 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical max of 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 to 75 mm range. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG sensors. Fixed TPU bumpers decelerate the stroke end, but the adjuster is not a mid-stroke lock.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
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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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