Airtac MFJ Adjustable Mini Cylinder MFJ40X350-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X350-50S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 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 MFJ40X350-50S
Trim the extend position by up to 50 mm on site with the AirTAC MFJ40X350-50S, a JIS-standard round-body mini cylinder built for double-acting service. The external adjuster lets you dial in the 300 to 350 mm extend end without buying a new unit or adding external stops, making it highly useful for trial fits and line changeovers where the exact stroke is not final. A built-in magnet (-S) enables CMSG, DMSG or EMSG switches for position sensing.
This 40 mm bore variant delivers 628.3 N of push force and 527.8 N of pull at 0.5 MPa, peaking at a theoretical 128.1 kgf at 1.0 MPa. The riveted SUS304 stainless barrel and aluminium covers resist mild corrosion and washdown while keeping the total body shorter than a comparable ISO 6432 cylinder. With fixed TPU bumper pads decelerating the stroke end, it handles a safe working load of roughly 377 N or lifts about 32 kg vertically with a 2:1 margin. The 1/4" port and M14x1.5 male rod thread match the standard 40 mm bore specification.
Airtac MFJ Adjustable Mini Cylinder MFJ40X350-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X350-50S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 MFJ40X350-50S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 MFJ40X350-50S Is Used
Changeover Stations
Fine-tune the 300 to 350 mm extend stroke on site during product changeovers, using the 50 mm adjuster to set new end positions without swapping the cylinder.
Trial Fit Rigs
Leverage the 628.3 N push force to test part seating depths, dialing the external adjuster inward to find the exact 40 mm bore extend distance before finalizing the design.
Variable-Position Stops
Safely move workpieces weighing up to 377 N by shortening the extend end up to 50 mm, creating adaptable hard stops for varying product sizes on the same line.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X350-50S the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need extra thrust: the 40 mm bore pushes 628.3 N at 0.5 MPa compared to 402.2 N for the 32 mm version. Both share the 1/4" port size, but the larger 16 mm rod provides greater rigidity for the 350 mm stroke. The 50 mm adjustable window is perfect for variable-position stops and commissioning rigs where the final extend distance is unknown.
Mount this cylinder using LB foot, FA flange, or TC trunnion brackets, as there is no SDB or back-cover option. Remember that the fixed TPU bumpers only decelerate the stroke end; they do not lock the piston. If you need to hold a load vertically during air loss, install an external rod lock or pilot check valve, because the piston will drift.
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 MFJ40X350-50S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. 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 50 mm on site, giving a usable extend range of 300 to 350 mm without changing the full retract. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG switches. Fixed TPU bumpers decelerate the stroke ends but do not lock the load.
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1-Year Warranty
Covers non-human-caused product damage.
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