Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50STC
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50STC is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MFJ40X50-50STC
Trimming the extend end by up to 50 mm on-site, the MFJ40X50-50STC eliminates the need to swap cylinders during line changeovers or trial fits. This JIS-standard round-body mini cylinder uses a SUS304 stainless barrel and riveted aluminium covers, offering a shorter mounting envelope than an equivalent ISO 6432 unit while resisting mild washdown. A 1/4" port and Ø16 rod handle a robust 628.3 N push force at 0.5 MPa.
The -S suffix equips this double-acting actuator with a piston magnet for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers decelerate the stroke ends across the 30-800 mm/s speed range. Based on the 0.5 MPa push rating, it delivers a safe working load around 377 N, lifting roughly 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50STC Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50STC |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MFJ40X50-50STC
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MFJ40X50-50STC Is Used
Changeover Dial-In
Fine-tune the extend position up to 50 mm during product format changes, using the 628.3 N thrust to push new jig sizes without machining external stops.
Prototype Fit Station
Safely test end-of-arm tooling positions on trial assemblies, relying on the 377 N safe working load to verify placement before finalizing the design.
Variable Position Stops
Adjust the extend endpoint on the fly for batch-specific clamping depths, letting the TC trunnion absorb any slight angular misalignment.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50STC the Right Cylinder?
When sizing between the two available bores, the MFJ40 provides 628.3 N of push force at 0.5 MPa, stepping up from the 402.2 N delivered by the MFJ32. Choose this 40 mm bore when moving heavier fixtures, and use the 50 mm external adjuster to dial in the exact extend position without buying a new unit. The included TC trunnion mount supports pivoting loads.
Remember that fixed bumpers only decelerate the stroke end; they do not function as a lock. If air pressure drops, the piston drifts, so install an external rod lock or pilot check valve for suspended loads. This SKU includes the -S magnet for sensors, whereas a non-S variant cannot accept a switch.
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 MFJ40X50-50STC FAQ
This 40 mm bore cylinder uses a 1/4" port. 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 maximum of 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 50 mm on-site, while the retract stroke remains full. Fixed TPU bumper pads decelerate the piston at the stroke ends; it is not an adjustable air cushion. The -S magnet allows CMSG, DMSG, or EMSG sensors to be fitted.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
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