Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S
Trim the extend end by up to 50 mm on-site with the AirTAC MFJ40X80-50S, a JIS-standard round-body mini cylinder built for double-acting service. The external adjuster lets you dial in the exact 30 to 80 mm extend position during line changeovers without buying a new unit or adding external stops. A 1/4" port feeds the 40 mm bore, generating 628.3 N of push force at 0.5 MPa.
The riveted SUS304 stainless barrel and aluminium covers resist mild washdown while keeping the total envelope shorter than a comparable ISO 6432 cylinder. This -S variant includes a piston magnet for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers absorb end-of-stroke impact. Based on the 0.5 MPa push rating, expect a safe working load around 377 N, or roughly 32 kg of vertical lift with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFJ40X80-50S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MFJ40X80-50S Is Used
Changeover Stations
Fine-tune the extend position up to 50 mm during product format changes, hitting the exact stop without swapping cylinders.
Trial Fit Rigs
Test multiple extend lengths on the fly to find the optimal push distance for a 628.3 N assembly process.
Variable Position Stops
Adjust the end point on automated tooling to accommodate different part sizes while keeping the 1/4" ported pneumatic footprint compact.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50S the Right Cylinder?
Choose the 40 mm bore over the 32 mm when you need more muscle: the MFJ40 delivers 628.3 N push at 0.5 MPa versus 402.2 N for the MFJ32. The 50 mm adjustment window here is ideal for trial fits and variable-position stops where the final extend point is not yet locked down. Mount using LB foot, FA flange, or TC trunnion brackets (SDB is not available). Because the TPU bumper only decelerates the stroke end and does not lock the rod, add an external rod lock or pilot check valve if the load must be held on air loss.
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 MFJ40X80-50S FAQ
This 40 mm bore cylinder uses a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 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 on-site, giving a usable 30 to 80 mm extend 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 stroke end but do not lock the load.
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1-Year Warranty
Covers non-human-caused product damage.
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