Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 15mm 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
- Stroke15 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 MFCJ40X15-20S
Tune both the extend reach and the end-of-travel shock on site with this 40 mm bore JIS-standard round-body mini cylinder. The external adjuster shortens the extend stroke by up to a 20 mm window, while the needle-set variable air cushion at both ends soaks up high-speed impact for smooth deceleration. An integrated magnet (-S) enables position sensing.
Built with a SUS304 stainless barrel and riveted aluminium covers, the body is shorter than an ISO 6432 cylinder for the same stroke, saving valuable mounting space while resisting mild washdown corrosion. Delivering 628.3 N of push force at 0.5 MPa, it yields a safe working load of about 377 N or roughly 32 kg of vertical lift with a 2:1 margin. The 1/4" port and M14x1.5 male rod thread handle robust airflow for 30-800 mm/s cycling.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 15 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 MFCJ40X15-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 MFCJ40X15-20S Is Used
High-Speed Part Insertion
Dial in the exact 15 mm extend reach and tune the needle air cushions to softly seat components without slamming, leveraging the 628.3 N push force for reliable placement.
Package Diverting
Adjust the stroke window on the fly to handle varying carton sizes on a packaging line, using the variable air cushion to absorb the high-speed retract shock.
Light Pallet Lifts
Lift or index loads up to 32 kg vertically with a 2:1 safety margin, relying on the 40 mm bore's robust thrust and CMSG sensors to confirm positioning.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need heavier push force: the 40 mm bore delivers 628.3 N at 0.5 MPa compared to 402.2 N for the 32 mm bore. This adjustable-stroke, variable-cushion design is purpose-built for high-speed changeovers and shock-sensitive trial fits where you must dial in the exact extend endpoint and deceleration rate on the floor.
Remember that the air cushion only decelerates the piston near the end of stroke; it is not a brake. If the machine loses air, the piston will drift, so install an external rod lock or pilot check valve to hold a suspended load. Mount using LB foot, FA flange, or TC trunnion brackets (no SDB), and use CMSG, DMSG, or EMSG switches with this -S magnet model.
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 MFCJ40X15-20S 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.
The external adjuster shortens the extend stroke by up to 20 mm, and the needle-set variable air cushion at both ends decelerates the piston for smooth stops. The cushion is not a brake; the cylinder cannot hold a load on air loss, so use an external rod lock if needed. The built-in -S magnet supports CMSG, DMSG, and 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.
Related AirTAC MFCJ Cylinders
Request a Quote for Airtac MFCJ Adjustable Mini Cylinder MFCJ40X15-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.