Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50 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
- 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 MFJ40X80-50
Trimming the extend stroke by up to 50 mm on site, this double-acting AirTAC mini cylinder lets you dial in the exact end position without buying a new unit. The 40 mm bore JIS-standard round body uses a SUS304 stainless barrel and riveted aluminium covers, measuring shorter than an ISO 6432 cylinder to save valuable mounting length. A 1/4" port and M14x1.5 male rod thread feed a robust force class, delivering 628.3 N of push force at 0.5 MPa.
The external adjuster shortens the nominal 80 mm extend down to 30 mm for trial fits and line changeovers, while the retract stroke remains full. Fixed TPU bumper pads decelerate the piston at the stroke ends. This non-magnet SKU cannot take a sensor; adding the -S option enables CMSG, DMSG, or EMSG switches. With a 0.5 MPa push force, expect a safe working load around 377 N, lifting roughly 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50 |
|---|---|
| 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 MFJ40X80-50
| 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 MFJ40X80-50 Is Used
Changeover Stations
Dial in the extend position up to 50 mm during product family changeovers, using the 628.3 N push force to shift heavy tooling without adding external mechanical stops.
Prototype Set-up Rigs
Perfect for trial assemblies where the final extend length is unknown, letting engineers safely test the 32 kg vertical lift capacity before locking down the design.
Variable-Position Stops
Adjust the end stop on the fly for flexible machining fixtures, relying on the fixed TPU bumpers to absorb the impact of the 16 mm rod at cycle completion.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-50 the Right Cylinder?
When sizing these adjustable units, compare both bores directly: the MFJ40 hits 628.3 N push at 0.5 MPa, whereas the MFJ32 provides 402.2 N. Choose the 40 mm bore when moving heavier jigs, and rely on the 50 mm adjustment window to perfect the stroke during commissioning instead of machining external stops. The cylinder operates at 30-800 mm/s with an operating pressure of 0.15-1.0 MPa.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code exists for this build). Remember that the bumper pads only decelerate the load; a plain cylinder drifts on air loss. To hold a vertical load safely, fit an external rod lock or pilot check valve. This base SKU lacks a magnet, so order the -S variant if you require CMSG, DMSG, or EMSG position sensing.
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 MFJ40X80-50 FAQ
This 40 mm bore cylinder features a 1/4" port, a 16 mm rod, and an M14x1.5 male 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 maximum of 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 30-80 mm, while the retract stroke remains full. Fixed TPU bumper pads decelerate the piston at the ends; it is not an adjustable air cushion. Note this SKU lacks a magnet, so it cannot take a sensor without the -S option.
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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.
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Most inquiries answered within 7-8 hours.
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