Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm 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
- Stroke125 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 MFCJ20X125-50
Dial in exact extend lengths on-site with the AirTAC MFCJ20X125-50, a JIS-standard round-body mini cylinder featuring a 50mm adjustable stroke window and variable air cushions at both ends. The external adjuster shortens the extend stroke down from a 125mm maximum to a 75mm usable limit, while the needle cushions soak up high-speed end-of-stroke shock.
Built with a SUS304 stainless barrel and riveted aluminium covers, this 20mm bore unit delivers 157N of push force at 0.5MPa via a 1/8" port. It yields a safe working load of roughly 94N, lifting about 8kg vertically with a 2:1 margin. Note that this specific SKU lacks a magnet and cannot accept position sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MFCJ20X125-50
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | 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 MFCJ20X125-50 Is Used
Adjustable Stopper
Sets precise 75-125mm extend stops for varying product widths on a packaging line without swapping cylinders.
Gentle Diverting
Uses the needle air cushion to decelerate the 157N push force smoothly, preventing impact damage when routing lightweight goods.
Trial Fit Jig
Fine-tunes the extend endpoint on-site during machine commissioning to find the exact 8kg vertical lift sweet spot.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-50 the Right Cylinder?
When sizing this 20mm bore against the MFCJ25 (245.3N at 0.5MPa), choose the 20mm for lighter, shock-sensitive trial fits where exact positioning and end-deceleration matter more than raw thrust. The adjustable stroke and dual needle cushions excel in high-speed changeovers, but remember the cushion only decelerates the piston—it is not a lock. The piston will drift on air loss, so add an external rod lock or pilot check valve for suspended loads. Mount via LB foot, FA flange, or TC trunnion, and upgrade to an -S variant if you need CMSG/DMSG/EMSG switches.
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 MFCJ20X125-50 FAQ
This 20mm bore cylinder uses a 1/8" port and generates 157N push / 131.9N pull at 0.5MPa, and 219.8N push / 184.7N pull at 0.7MPa, with a theoretical max of 32kgf at 1.0MPa.
No, this specific SKU lacks the -S magnet option and cannot accept CMSG, DMSG, or EMSG switches. You must select an -S variant to enable magnetic sensing.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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