Airtac MFCJ Adjustable Mini Cylinder MFCJ20X20-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X20-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 20mm stroke, 1/8" 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.
- BoreØ20 mm
- Stroke20 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- 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 MFCJ20X20-20S
Trim the extend stroke by up to 20 mm on site and dial in a needle air cushion at each end to absorb high-speed shock with the AirTAC MFCJ20X20-20S. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter mounting envelope than an ISO 6432 unit for the same 20 mm bore and stroke. The double-acting design delivers 157 N of push force at 0.5 MPa, making it ideal for light-duty changeovers.
Because this SKU carries the -S suffix, it includes a built-in piston magnet for CMSG, DMSG, or EMSG position switches. With a 1/8" air port and an M8x1.25 male rod thread, it yields a safe working load of roughly 94 N and lifts about 8 kg vertically with a 2:1 margin. The external adjuster sets the end position but does not lock mid-stroke, while the cushion purely decelerates the piston near the ends.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X20-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X20-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 20 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MFCJ20X20-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | 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 MFCJ20X20-20S Is Used
Light-Duty Trial Fits
Dial in the exact extend position within the 20 mm window during short-stroke assembly changeovers, using the 157 N push force to seat small components gently.
High-Speed Pick & Place
Soak up end-of-stroke shock on rapid transfers with the needle-set variable air cushion, ensuring the 8 kg vertical lift capacity lands smoothly without hard impacts.
Lab Automation Jigs
Fit the compact SUS304 stainless body into tight washdown-resistant test fixtures, relying on the built-in magnet for precise CMSG/DMSG/EMSG switch feedback.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X20-20S the Right Cylinder?
When sizing these adjustable-stroke units, compare the real thrust figures: this 20 mm bore pushes 157 N at 0.5 MPa, whereas stepping up to the MFCJ25 provides 245.3 N. Choose the 20 mm bore for compact, low-force trial fits where exact end-positioning and end-of-stroke shock both need tuning. Mount the cylinder using an LB foot, FA flange, or TC trunnion (there is no SDB option or back cover here), and pair it with CMSG/DMSG/EMSG sensors since the -S magnet is present.
Remember that the variable air cushion only decelerates the piston near the stroke end—it is not a brake. A plain double-acting cylinder drifts if air pressure drops or the valve is centred, so install an external rod lock or pilot-operated check valve if your application must hold a load securely.
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 MFCJ20X20-20S FAQ
This double-acting cylinder has a 20 mm bore, a 1/8" air port, and an M8x1.25 male rod thread. It generates 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N push and 184.7 N pull at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm, while the variable air cushion at both ends decelerates the piston near the ends for smooth stops. The cushion is not a brake; the cylinder drifts on air loss, so use an external rod lock or pilot check valve for load holding.
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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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