Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm stroke, 1/4" 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.
- BoreØ40 mm
- Stroke20 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- 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 MFCJ40X20-10
Tune both the extend end-point and the end-of-stroke shock precisely with this 40 mm bore, 20 mm stroke adjustable mini cylinder. A built-in external adjuster lets you shorten the extend stroke by up to 10 mm on-site, while the variable air cushion at both ends soaks up high-speed impact for smooth, quiet motion. The riveted SUS304 stainless round body and aluminium covers yield a shorter mounting envelope than an ISO 6432 cylinder of the same size, resisting mild washdown corrosion.
Delivering 628.3 N push and 527.8 N pull force at 0.5 MPa, this double-acting JIS-standard actuator fits demanding trial-fit stations. It provides a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin. Note this SKU lacks a magnet, so it cannot take CMSG, DMSG or EMSG sensors; specify the -S variant for position sensing.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MFCJ40X20-10
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | 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 MFCJ40X20-10 Is Used
Precision Valve Seating
Dial in the exact 10 to 20 mm extend contact point during high-speed valve assembly, relying on the 628.3 N thrust to seat components firmly while the needle cushion prevents impact damage.
Changeover Trial Fits
Perfect for lab or line changeovers where the stroke endpoint varies slightly by part family; shorten the extend on-site by up to 10 mm and tune the air cushion to absorb the 800 mm/s shock.
Light Pressing Tasks
Execute delicate pressing or aligning operations using the 377 N safe working load, adjusting the extend distance precisely to avoid over-travel on fragile subcomponents.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X20-10 the Right Cylinder?
When sizing this series, compare both bores directly: the MFCJ32 provides 402.2 N push at 0.5 MPa, whereas this MFCJ40 delivers 628.3 N. Choose the 40 mm bore when your changeover mechanism or fixture demands that extra thrust within a tight 10 to 20 mm extend window. The external adjuster is perfect for trial fits where the exact end position and end-of-stroke shock both need tuning on the fly.
Mount this cylinder using LB foot, FA flange or TC trunnion brackets (SDB is unavailable). Because the air cushion only decelerates the piston near the end of travel, it acts purely as a shock absorber and never as a lock. The piston will drift if air pressure drops, so install an external rod lock or pilot check valve to hold a suspended load safely.
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 MFCJ40X20-10 FAQ
This 40 mm bore cylinder features a 1/4" air port and an M14x1.5 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum force of 128.1 kgf at 1.0 MPa.
No, this specific SKU does not include a magnet and cannot accept CMSG, DMSG or EMSG switches. You must select the -S variant to enable magnetic sensing. The 10 mm adjustable window only shortens the extend stroke end position; it is not a mid-stroke lock.
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1-Year Warranty
Covers non-human-caused product damage.
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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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