Airtac MFCJ Adjustable Mini Cylinder MFCJ20X50-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X50-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 MFCJ20X50-20S
Dial in exact end positions and absorb high-speed shocks with the AirTAC MFCJ20X50-20S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 20 mm on-site, while needle variable air cushions at both ends soak up end-of-stroke impact. Because this SKU includes the -S magnet, it is fully ready for CMSG, DMSG or EMSG position switches.
Operating at 0.15-1.0 MPa with a 1/8" port and an Ø8 mm rod, this double-acting actuator delivers 157 N of push force at 0.5 MPa. It yields a safe working load of about 94 N, easily lifting roughly 8 kg vertically with a 2:1 margin. For the same bore and stroke, this compact riveted body is notably shorter than an ISO 6432 cylinder, saving valuable mounting length without requiring a tie-rod or profile design.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X50-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X50-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 50 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 MFCJ20X50-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 MFCJ20X50-20S Is Used
Micro-Clamp Trial Fits
Perfect for dialing in a 30-50 mm clamping reach on delicate electronics, using the 20 mm adjuster to find the exact contact point without over-stressing the 8 kg load capacity.
High-Speed Diverter Gate
Variable air cushions absorb the rapid end-of-stroke shock of a lightweight package routing flap, while the on-site adjuster fine-tunes the push angle for varying box sizes.
Small Part Ejection
Ejects molded components at speed; the needle cushion prevents banging at the extend end, and the 157 N thrust ensures reliable ejection of light plastic parts.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X50-20S the Right Cylinder?
Choose between the MFCJ20 and the larger MFCJ25 by comparing thrust needs: the 20 mm bore provides 157 N push at 0.5 MPa, whereas the MFCJ25 offers 245.3 N. This MFCJ20X50-20S is ideal for high-speed changeovers and shock-sensitive trial fits where you must tune both the 20 mm extend window and the needle cushion. Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount is available).
Remember that the air cushion and external adjuster only decelerate the piston or set its end position; they do not function as a brake. If your application must hold a load vertically during air loss, add an external rod lock or pilot-operated check valve, as the piston will drift otherwise.
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 MFCJ20X50-20S FAQ
This 20 mm bore cylinder features a 1/8" port and an Ø8 mm rod. 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. Operating pressure ranges from 0.15 to 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm (usable range 30-50 mm), while the variable air cushion at both ends decelerates the piston near the ends for smooth high-speed motion. The cushion is not a brake; the piston will drift on air loss, so use an external rod lock for vertical load holding. The -S suffix means it has a built-in magnet for CMSG, DMSG, or EMSG sensors.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
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