Airtac MFJ Adjustable Mini Cylinder MFJ40X300-75S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X300-75S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 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 MFJ40X300-75S
Trimming the extend end by up to 75 mm directly at the fixture, the AirTAC MFJ40X300-75S sets usable forward travel between 225 mm and 300 mm without swapping hardware. This JIS-standard round-body mini cylinder pairs a SUS304 stainless steel barrel with riveted aluminium covers, yielding a shorter overall envelope than an ISO 6432 unit of identical bore and stroke. The integrated -S piston magnet supports CMSG, DMSG and EMSG switches for position sensing.
Driven by a 16 mm rod through a 1/4" port, the 40 mm bore delivers 628.3 N push and 527.8 N pull at 0.5 MPa, peaking at a 128.1 kgf theoretical maximum at 1.0 MPa. For practical sizing, expect a safe working load near 377 N, lifting roughly 32 kg vertically with a 2:1 margin. Fixed TPU bumper pads absorb end-of-stroke impact across the 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ40X300-75S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X300-75S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MFJ40X300-75S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MFJ40X300-75S Is Used
Changeover Stations
Dial in the extend stroke by up to 75 mm during product format changes, using the 628.3 N push force to shift medium-weight tooling carts into calibrated stops.
Prototype Fit Rigs
Iterate on exact end positions across the 225-300 mm travel window without machining new spacers, leveraging the SUS304 barrel for light washdown resistance.
Variable Position Stops
Fine-tune the lowering depth of a 32 kg vertical lift payload on the fly, relying on fixed TPU bumpers to soften the final impact.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X300-75S the Right Cylinder?
When sizing this family, the MFJ32 generates 402.2 N push at 0.5 MPa, whereas this MFJ40 provides 628.3 N—choose the 40 mm bore when moving heavier platens or overcoming higher friction. The 75 mm adjustable window is ideal for trial fits and line changeovers where the exact end position remains unknown during commissioning. Mount using LB foot, FA flange or TC trunnion brackets; SDB and rear-cover options are absent on this adjustable build.
The external adjuster sets the forward end point but does not function as a mid-stroke lock. If air pressure drops, the piston drifts; for fail-safe load holding, install an external rod lock or pilot-operated check valve. The built-in magnet allows seamless sensor integration, whereas non-S SKUs cannot accept switches.
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 MFJ40X300-75S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 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 75 mm on-site, giving a usable 225-300 mm forward travel 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; the adjuster is not a mid-stroke lock.
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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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