Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100S 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 MFJ40X250-100S
Dial in your extend position on-site with the AirTAC MFJ40X250-100S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. The external adjuster lets you shorten the extend stroke by up to 100 mm, giving a usable window of 150 to 250 mm for trial fits and line changeovers without buying a new cylinder. A 1/4" port and M14x1.5 male rod thread feed the 16 mm rod, delivering 628.3 N of push force at 0.5 MPa.
Because the -S suffix includes a built-in piston magnet, you can mount CMSG, DMSG, or EMSG switches for position sensing. The riveted construction is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length while resisting mild washdown. Factoring a 2:1 safety margin, this bore lifts about 32 kg vertically, equating to a safe working load of roughly 377 N.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100S |
|---|---|
| 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 MFJ40X250-100S
| 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 MFJ40X250-100S Is Used
Changeover Stations
Fine-tune the 150 to 250 mm extend position during product format changes without swapping out the entire cylinder.
Trial Fit Rigs
Test multiple extend endpoints on prototypes safely, relying on the 628.3 N push force to move test fixtures.
Variable Position Stops
Adjust the stroke end on the fly to act as a soft stop for varying part sizes, decelerated by fixed TPU bumpers.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100S the Right Cylinder?
When sizing between the two available bores, the MFJ40 delivers 628.3 N push at 0.5 MPa compared to 402.2 N for the MFJ32, making this 40 mm bore the better choice when you need that extra lift margin. The 100 mm adjustable window is ideal for changeover stations where the exact end position is unknown during commissioning. Mounting options include LB foot, FA flange, and TC trunnion, with no SDB or back-cover option available on this build.
Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the load. If air pressure drops, the piston will drift, so install an external rod lock or pilot check valve for vertical holding. The -S magnet enables CMSG, DMSG, or EMSG sensors, whereas a standard SKU without the S suffix cannot take a switch.
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 MFJ40X250-100S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod. At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 100 mm on-site, giving a usable extend range of 150 to 250 mm while retract remains full. It uses fixed TPU bumper pads to decelerate the stroke end, not an adjustable air cushion. The -S suffix means it has a 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.
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Most inquiries answered within 7-8 hours.
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