Airtac MFJ Adjustable Mini Cylinder MFJ40X100-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X100-40S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 100mm 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
- Stroke100 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 MFJ40X100-40S
Trimming the extend end by up to 40 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in the 60 to 100 mm usable stroke without buying a new unit. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is shorter than an ISO 6432 cylinder for the same 40 mm bore and 100 mm stroke, resisting mild washdown. An integrated piston magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing.
Operating at 0.15 to 1.0 MPa through a 1/4" port, the 16 mm rod generates 628.3 N of push force at 0.5 MPa. This yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin. Fixed TPU bumper pads absorb end-of-stroke impacts across the 30 to 800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ40X100-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X100-40S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 100 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 MFJ40X100-40S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 MFJ40X100-40S Is Used
Changeover Stations
Fine-tune the extend position by up to 40 mm during product format changes, securing the new stop without swapping out the entire actuator.
Trial Fit Rigs
Safely test end positions on prototype assemblies, using the 628.3 N push force to seat components while adjusting the stroke window on the fly.
Variable Position Stops
Set precise 60 to 100 mm extend endpoints for multi-stage tooling heads, relying on the 1/4" port and 16 mm rod for consistent motion.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X100-40S the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need the higher thrust: the 40 mm bore pushes 628.3 N at 0.5 MPa, whereas the 32 mm bore delivers 402.2 N. The external adjuster is perfect for trial fits and line changeovers where the exact end position is not final. Mount using LB foot, FA flange, or TC trunnion brackets (no SDB option exists). Because the -S magnet is present, you can directly fit CMSG, DMSG or EMSG sensors.
Remember that the bumper pads only decelerate the stroke end; they do not lock the piston. If air pressure drops, the load drifts. To hold a vertical load securely, install an external rod lock or a pilot-operated check valve rather than relying on the cylinder itself.
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 MFJ40X100-40S FAQ
This 40 mm bore cylinder has a 16 mm rod, M14x1.5 male thread, and a 1/4" port. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical max of 128.1 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 40 mm on site, giving a usable extend range of 60 to 100 mm, while retract remains full. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG switches. Fixed TPU bumpers decelerate the ends, but the cylinder does not lock the load on air loss.
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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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