Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40 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 MFJ40X80-40
Trimming the extend end by up to 40 mm on site, the AirTAC MFJ40X80-40 lets you set a precise 40 to 80 mm forward position without swapping hardware. This JIS-standard round-body mini cylinder pairs a SUS304 stainless steel barrel with riveted aluminium covers, yielding a shorter mounting envelope than an ISO 6432 unit of the same bore and stroke.
Built for double-acting service at 0.15 to 1.0 MPa, the 40 mm bore delivers 628.3 N of push force at 0.5 MPa, making the safe working load roughly 377 N or about 32 kg of vertical lift with a 2:1 margin. The 1/4 inch port and M14x1.5 male rod thread handle the airflow, while fixed TPU bumpers absorb end impacts. Note this SKU lacks the -S magnet, so it cannot host CMSG, DMSG or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40 |
|---|---|
| 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 MFJ40X80-40
| 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 MFJ40X80-40 Is Used
Changeover Stations
Dial in the 40 mm extend window during format changes to position a 32 kg vertical lift bracket precisely without machining new hard stops.
Trial Fit Rigs
Leverage the 628.3 N push force to seat components, adjusting the forward stroke on the fly until the optimal 40 to 80 mm travel is proven.
Washdown Stops
Rely on the SUS304 stainless barrel for mild corrosion resistance while setting variable end positions for packaging pushers in damp environments.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40 the Right Cylinder?
When sizing between the two available bores, the MFJ40 provides 628.3 N push at 0.5 MPa versus 402.2 N for the MFJ32, making the 40 mm bore the right pick when your fixture needs that extra thrust margin. The 40 mm adjuster window is ideal for trial fits and line changeovers where the exact extend position is unknown until commissioning.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover mount). Remember that fixed TPU bumpers only decelerate the stroke end; the piston drifts on air loss, so install an external rod lock or pilot check valve if you need to hold a load vertically.
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 MFJ40X80-40 FAQ
This 40 mm bore cylinder features a 1/4 inch port and delivers 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.
An external adjuster shortens the extend stroke by up to 40 mm on site, giving a usable 40 to 80 mm forward travel, while the retract remains full. Fixed TPU bumper pads decelerate the stroke end; this unit has no -S magnet, so magnetic sensors cannot 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.
Request a Quote for Airtac MFJ Adjustable Mini Cylinder MFJ40X80-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.