Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
- 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 MFCJ Adjustable Mini Cylinder MFCJ40X20-10S
Trim the extend stroke by up to 10 mm on site with the MFCJ40X20-10S, a JIS-standard round-body mini cylinder built from a SUS304 stainless barrel and riveted aluminium covers. The external adjuster lets you dial in the exact end position for high-speed changeovers, while the needle-set variable air cushion at both ends soaks up end-of-stroke shock. A 1/4" port and M14x1.5 male rod thread handle the 40 mm bore's air and mounting needs.
This double-acting unit delivers 628.3 N of push force at 0.5 MPa, placing it in a heavy-duty class for a compact mini cylinder. The riveted body is shorter than an ISO 6432 cylinder for the same stroke, saving valuable machine space, and the built-in magnet (-S) supports CMSG, DMSG or EMSG switches. The cushion only decelerates the piston near the end of travel; it is not a lock.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| 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 | Variable air cushion, both ends |
| 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 MFCJ Adjustable Mini Cylinder MFCJ40X20-10S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MFCJ Adjustable Mini Cylinder MFCJ40X20-10S Is Used
Short-Stroke Clamping
Dial in a precise 10 to 20 mm clamp extension on machining fixtures, using the 628.3 N push force to secure heavy aluminium housings without overshooting.
High-Speed Diverting
Tune the variable air cushion to absorb shock during rapid package diverting, adjusting the actuator end-point on the fly to handle varying box sizes.
Pallet Stopper Tuning
Fine-tune the stopping position of pallets on a washdown line; the SUS304 stainless barrel resists mild moisture while the cushion softens high-speed impacts.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10S the Right Cylinder?
Choose the MFCJ40 when you need serious push force: it yields 628.3 N at 0.5 MPa compared to 402.2 N for the MFCJ32. This 40 mm bore is ideal for shock-sensitive trial fits where you must tune both the extend position and the end-of-stroke deceleration. The 1/4" port feeds the 30-800 mm/s speed range efficiently.
Because the -S magnet is present, you can fit CMSG, DMSG or EMSG sensors directly. Mount via LB foot, FA flange or TC trunnion (there is no SDB option or back cover on this build). Note that a plain cylinder drifts on air loss; for a held load, install an external rod lock or pilot check valve rather than relying on the cushion.
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 MFCJ Adjustable Mini Cylinder MFCJ40X20-10S FAQ
This 40 mm bore cylinder uses a 1/4" port. 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 10 mm (usable range 10-20 mm) for on-site tuning, while the variable air cushion decelerates the piston at stroke end. The cushion is not a brake; the piston will drift on air loss, so use an external rod lock to hold a load. The -S magnet allows CMSG, DMSG or EMSG sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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