Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50
Trim the extend stroke by up to 50 mm on-site with the external adjuster on this AirTAC MFJ40X75-50 cylinder, avoiding external stops during line changeovers. As a JIS-standard round-body mini unit, its riveted aluminium covers and SUS304 stainless steel barrel deliver a shorter mounting envelope than an ISO 6432 cylinder for the same 40 mm bore and 75 mm stroke.
Operating at 0.15-1.0 MPa, the 40 mm bore generates 628.3 N of push force and 527.8 N of pull force at 0.5 MPa. This translates to a safe working load of roughly 377 N, or lifting about 32 kg vertically with a 2:1 safety margin. The 1/4" port and M14x1.5 male rod thread handle flow easily, while fixed TPU bumpers absorb end-of-stroke impacts at speeds of 30-800 mm/s.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 MFJ40X75-50
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MFJ40X75-50 Is Used
Changeover Dial-In
Fine-tune the extend endpoint within the 50 mm window during product format changes, delivering 628.3 N of push force to seat varying tooling heights.
Prototype Fit-Up
Perfect for R&D rigs where the final stroke is unknown, allowing on-site adjustability without machining custom spacers for the 32 kg vertical lift capacity.
Variable Position Stops
Acts as an internal mechanical stop that shortens the extend stroke by up to 50 mm, replacing bulky external hard stops on compact 40 mm bore assemblies.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-50 the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need extra muscle: the 40 mm bore pushes 628.3 N at 0.5 MPa compared to 402.2 N for the 32 mm bore. This 50 mm adjustable window is ideal for trial fits where the exact extend position is unknown, letting you dial in the stroke from 25 to 75 mm without swapping hardware. Mount using LB foot, FA flange, or TC trunnion brackets.
Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors; add the -S option if you require position detection. Note that the TPU bumper only decelerates the stroke end and does not act as a brake. The piston will drift on air loss, so install an external rod lock or pilot check valve for suspended loads.
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 MFJ40X75-50 FAQ
This 40 mm bore double-acting cylinder features a 1/4" port and an M14x1.5 male rod 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, but it does not function as a mid-stroke lock. Fixed TPU bumper pads only decelerate the piston near the end of travel. The cylinder cannot hold a load on air loss, so use an external rod lock for suspended loads.
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1-Year Warranty
Covers non-human-caused product damage.
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