Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-40 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 MFCJ20X40-40
Dial in the exact extend end-point on site with the AirTAC MFCJ20X40-40, a JIS-standard round-body mini cylinder featuring a 40 mm adjustable stroke window and needle-set variable air cushions at both ends. The SUS304 stainless barrel and riveted aluminium covers yield a shorter mounting envelope than an ISO 6432 unit of the same size, while resisting mild washdown corrosion. A 1/8" port and M8x1.25 male rod thread equip this 20 mm bore build.
Operating at 30-800 mm/s, the double-acting thrust delivers 157 N push and 131.9 N pull at 0.5 MPa. This translates to a safe working load of about 94 N, letting you lift roughly 8 kg vertically with a 2:1 margin. Note this SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-40 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 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 MFCJ20X40-40
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 MFCJ20X40-40 Is Used
Light-Duty Pick & Place
Handles small electronic components under the 94 N safe load limit, using the 40 mm stroke adjuster to fine-tune the extend reach for varying fixture heights without crashing.
Carton Flap Folding
Deploys at high speed to fold light cardboard flaps; the variable air cushion prevents harsh impacts at the end of the stroke, ensuring quiet operation on packaging lines.
Lab Test Actuators
Drives small sample trays or test probes where exact end-position tuning is critical, leveraging the 157 N push force to reliably cycle delicate mechanisms.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-40 the Right Cylinder?
Weigh the MFCJ20X40-40 against the larger MFCJ25 (245.3 N push at 0.5 MPa) if your payload exceeds the 20 mm bore's 157 N capacity. The 20 mm bore is ideal for lighter, high-speed changeovers where tuning the extend stroke by up to 40 mm prevents mechanical crashes, and the variable air cushion soaks up end-of-stroke shock. Mount via LB foot, FA flange or TC trunnion (no SDB or back-cover option exists on this adjustable build).
Because the cushion only decelerates the piston near the end of travel and the adjuster sets the end position rather than clamping it, the cylinder will drift if air pressure drops. The piston does not lock mid-stroke. For suspended or gravity-loaded applications, fit an external rod lock or pilot-operated check valve to hold the load securely during air loss.
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 MFCJ20X40-40 FAQ
This 20 mm bore double-acting cylinder uses a 1/8" port and an 8 mm rod with an M8x1.25 male 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 force of 32 kgf at 1.0 MPa.
No, this specific SKU does not include the -S magnet option, so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for sensing. The external adjuster shortens the extend stroke by up to 40 mm, and the variable air cushion decelerates the piston at stroke end, but neither feature acts as a mid-stroke lock.
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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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