Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 300mm 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
- Stroke300 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 MFCJ20X300-40
Dial in exact end positions on-site with the AirTAC MFCJ20X300-40, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. The external adjuster shortens the extend stroke by up to 40 mm, giving a usable 260-300 mm extend window, while needle valves set a variable air cushion at both ends to soak up high-speed shock. It is a double-acting unit, not a tie-rod or profile body.
Driven by a 20 mm bore and a 1/8" port, it delivers 157 N push and 131.9 N pull at 0.5 MPa. This yields a safe working load around 94 N, or roughly 8 kg of vertical lift with a 2:1 margin. The compact riveted body is shorter than an ISO 6432 cylinder for the same stroke, saving mounting length. Note this SKU lacks a magnet, so it cannot take CMSG/DMSG/EMSG switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 300 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 MFCJ20X300-40
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×300 | 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 MFCJ20X300-40 Is Used
Lightweight Parts Ejection
Handles the 94 N safe working load to push small plastic parts out of a mould, using the 40 mm stroke adjuster to fine-tune the ejection reach during tooling trials.
High-Speed Diverting
Sorts light packages at up to 800 mm/s; the variable air cushion at both ends prevents end-of-stroke banging when cycling rapidly across the 300 mm travel.
Adjustable Stop Gate
Acts as a pneumatic stop on a roller conveyor, where the extend stroke can be shortened on-site by 40 mm to accommodate different carton lengths without changing mounts.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40 the Right Cylinder?
When sizing, compare both ways: this 20 mm bore gives 157 N push at 0.5 MPa, while stepping up to the MFCJ25 yields 245.3 N. Choose the 20 mm for lighter, high-speed changeovers where shock-sensitive trial fits demand a tuned cushion. The adjuster sets the end position but does not lock mid-stroke.
Mounting options include LB foot, FA flange and TC trunnion (no SDB). Because air cushions only decelerate near stroke end, the piston will drift on air loss; specify an external rod lock or pilot check valve to hold a suspended load. For position sensing, select the -S magnet variant instead of this non-magnet SKU.
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 MFCJ20X300-40 FAQ
This 20 mm bore cylinder uses a 1/8" port. At 0.5 MPa it provides 157 N push and 131.9 N pull. At 0.7 MPa it provides 219.8 N push and 184.7 N pull. The theoretical maximum force is 32 kgf at 1.0 MPa.
This specific SKU has no magnet (-S), so it cannot accept CMSG/DMSG/EMSG switches. The variable air cushion only decelerates the piston near stroke end; it is not a brake. The piston will drift on air loss, so use an external rod lock or pilot check valve to hold a load.
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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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