Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 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 MFCJ40X40-20S
Dial in exact end positions and absorb high-speed shocks with the AirTAC MFCJ40X40-20S, a JIS-standard round-body mini cylinder. The external adjuster shortens the 40 mm extend stroke by up to 20 mm on-site, while the needle-set variable air cushion at both ends ensures smooth deceleration. A 1/4" port and Ø16 rod handle serious force.
This SUS304 stainless steel and riveted aluminium build is shorter than an ISO 6432 cylinder for the same footprint, resisting mild washdown. With a 628.3 N push force at 0.5 MPa, it yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin. The -S suffix equips the piston with a magnet for CMSG, DMSG, or EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MFCJ40X40-20S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | 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 MFCJ40X40-20S Is Used
High-Speed Component Pressing
Micro-adjust the 20 mm extend window to dial in precise contact depth, relying on the variable air cushion to absorb the 628.3 N impact during rapid repetitive pressing.
Dynamic Package Diverting
Tune the stroke on-site to match varying carton sizes while the needle cushion silently halts the 32 kg payload at high cycle rates without jarring the conveyor frame.
Adjustable Stopper Gates
Set the exact protrusion needed for different pallet widths; the SUS304 barrel withstands damp dock environments while the cushion softens high-speed pallet strikes.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20S the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need extra muscle: the 40 mm bore delivers 628.3 N push at 0.5 MPa compared to 402.2 N on the 32 mm. The 20 mm adjustable window is perfect for trial fits where the exact extend point must be tuned alongside the air cushion to prevent end-of-stroke bangs.
Mount via LB foot, FA flange, or TC trunnion (no SDB). The cushion only decelerates the load; it does not lock the piston. If air drops, the rod drifts, so fit an external rod lock or pilot check valve for suspended loads.
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 MFCJ40X40-20S FAQ
This 40 mm bore cylinder uses a 1/4" port and a Ø16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the 40 mm extend stroke by up to 20 mm for on-site tuning, while the needle-set variable air cushion at both ends decelerates the piston to absorb high-speed shock. The -S magnet allows CMSG, DMSG, or EMSG sensors to be fitted for position detection.
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.
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