Airtac MFJ Adjustable Mini Cylinder MFJ40X250-75S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-75S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 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 MFJ40X250-75S
Fine-tune your extend end-position on-site with the AirTAC MFJ40X250-75S, a JIS-standard round-body mini cylinder featuring a 75 mm external adjustment window. Rather than machining new stops or buying another cylinder, you simply dial the stroke down from its 250 mm maximum to 175 mm to suit trial fits or line changeovers.
Built with a SUS304 stainless barrel and riveted aluminium covers, this double-acting actuator delivers 628.3 N of push force at 0.5 MPa through a 1/4" port. The riveted body is shorter than a comparable ISO 6432 unit, saving valuable mounting length. The -S suffix means a piston magnet is installed, allowing CMSG, DMSG or EMSG switches to track position. Fixed TPU bumper pads decelerate the stroke ends.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-75S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-75S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MFJ40X250-75S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MFJ40X250-75S Is Used
Changeover Stations
Dial in the 175-250 mm extend position during product changeovers without swapping the actuator or adding external mechanical stops.
Trial Fit Rigs
Use the 75 mm adjustment window to safely test end positions and clearances on new assemblies before finalising the stroke length.
Variable Position Stops
Leverage the 628.3 N push force to drive variable-position stops across different batch sizes on the same 40 mm bore tooling.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-75S the Right Cylinder?
When sizing these actuators, compare the real thrust: this MFJ40 bore yields 628.3 N push and 527.8 N pull at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N push. For this 40 mm bore, expect a safe working load around 377 N (roughly 60% of the 0.5 MPa push figure), or a vertical lift of about 32 kg with a 2:1 safety margin. Choose the 40 mm bore when your changeover rig needs that extra push capacity.
The 75 mm adjuster is ideal for commissioning stations where the exact extend position is not yet finalised. Mount using LB foot, FA flange, or TC trunnion brackets (SDB is not available). Remember that the bumper pads only decelerate the stroke end; the cylinder will drift and lose its load if air pressure drops, so fit an external rod lock or pilot check valve for holding. The -S magnet enables your sensors, while the M14x1.5 male rod thread handles the linkage.
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 MFJ40X250-75S FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It generates 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 lets you shorten the extend stroke by up to 75 mm on-site, giving a usable extend range of 175-250 mm; the retract stroke remains full. It uses fixed TPU bumper pads to decelerate the stroke ends rather than an adjustable air cushion. The -S suffix provides a built-in magnet for CMSG, DMSG or EMSG sensors.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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