Airtac MFJ Adjustable Mini Cylinder MFJ40X100-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X100-50S 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 MFJ40X100-50S
Trimming the extend stroke by up to 50 mm on site, this double-acting JIS-standard round-body mini cylinder removes the need to buy new hardware when exact end positions are not yet final. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is physically shorter than a comparable ISO 6432 unit, while the built-in -S magnet enables CMSG, DMSG or EMSG switches for position sensing. A 1/4" port and M14x1.5 male rod thread equip the 40 mm bore, which generates 628.3 N of push force at 0.5 MPa.
Fixed TPU bumper pads absorb impact energy at the stroke ends across the 30-800 mm/s speed range. Based on the 0.5 MPa push figure, this bore yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 safety margin. The external adjuster fine-tunes the extend end within the 50 mm window, but it does not function as a mid-stroke lock.
Airtac MFJ Adjustable Mini Cylinder MFJ40X100-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X100-50S |
|---|---|
| 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 MFJ40X100-50S
| 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 MFJ40X100-50S Is Used
Changeover Dial-In
Perfect for packaging lines needing rapid format changes, using the 50 mm adjuster to set the extend end precisely without swapping cylinders.
Prototype Stroke Setup
Ideal for test rigs where the exact extension is unknown, allowing engineers to fine-tune the 628.3 N push force endpoint during commissioning.
Variable Press Stops
Handles light pressing tasks up to 32 kg vertical lift, adjusting the downward travel on site to accommodate different material thicknesses.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X100-50S the Right Cylinder?
Choosing between the two MFJ bores comes down to force: this 40 mm bore delivers 628.3 N push and 527.8 N pull at 0.5 MPa, whereas the 32 mm bore provides 402.2 N push and 345.6 N pull. The 50 mm adjustment window is ideal for trial fits and line changeovers where the final extend position is unknown, letting you dial in the exact stop without external hardware. Mounting options include LB foot, FA flange and TC trunnion (no SDB). Because the -S magnet is present, you can directly fit CMSG, DMSG or EMSG sensors.
Remember that air pressure alone does not hold the load if air is lost; the piston will drift. The TPU bumpers only decelerate the stroke end rather than locking the rod. For suspended or vertical loads that must remain fixed during a pressure drop, install an external rod lock or a pilot-operated check valve.
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 MFJ40X100-50S FAQ
This 40 mm bore cylinder features a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm on site, giving a usable extend range of 50-100 mm; it does not add stroke beyond the base and is not a mid-stroke lock. The -S suffix means a built-in magnet is included for CMSG, DMSG or EMSG sensors, and fixed TPU bumpers decelerate the stroke ends.
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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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