Airtac MFJ Adjustable Mini Cylinder MFJ40X80-30
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-30 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 MFJ40X80-30
Trimming the extend end by up to 30 mm on site, the AirTAC MFJ40X80-30 saves you from buying a new cylinder when the exact end position is not final. This double-acting, JIS-standard round-body mini cylinder uses a SUS304 stainless barrel and riveted aluminium covers, yielding a shorter overall length than an ISO 6432 unit for the same 40 mm bore and 80 mm stroke. The 1/4" port and M14x1.5 male rod thread handle a robust force class, pushing 628.3 N at 0.5 MPa.
With fixed TPU bumper pads decelerating the stroke ends, it runs smoothly at 30-800 mm/s. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors. For sizing, the 628.3 N push force at 0.5 MPa translates to a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-30 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-30 |
|---|---|
| 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 MFJ40X80-30
| 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 MFJ40X80-30 Is Used
Changeover Stations
Fine-tune the extend position within the 30 mm window during product line changeovers, avoiding the cost and delay of swapping out entire cylinders for different part heights.
Trial Fit Rigs
Perfect for prototype testing where the exact 80 mm extend endpoint is unknown, letting engineers dial in the 628.3 N push force precisely where the workpiece sits.
Variable Position Stops
Acts as an adjustable mechanical stop for light pressing or holding tasks, using its 32 kg vertical lift capacity while the fixed TPU bumpers absorb the end-of-stroke impact.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-30 the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need extra muscle: the 40 mm bore delivers 628.3 N of push force at 0.5 MPa compared to 402.2 N on the 32 mm bore. The external adjuster here is ideal for trial fits and line changeovers, letting you dial in the extend stroke within the 30 mm window without adding external stops. Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Remember that the bumper only decelerates the stroke end; it does not lock the rod. If you need to hold a load on air loss, install an external rod lock or pilot check valve. Also, since this non-S SKU has no magnet, you must select an -S variant if you require 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 MFJ40X80-30 FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It delivers 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 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 30 mm on site, giving a usable extend range of 50-80 mm; the retract stroke remains full. The cylinder uses fixed TPU bumper pads to decelerate at the stroke ends, not an adjustable air cushion. Note that this SKU lacks a magnet (-S), so it cannot accept CMSG, DMSG, or EMSG sensors.
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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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