Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 80mm 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
- Stroke80 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 MFCJ20X80-40S
Dial in the exact extend position on-site with the AirTAC MFCJ20X80-40S, a JIS-standard round-body mini cylinder featuring a 40 mm adjustable stroke window (usable extend 40-80 mm) and needle-set variable air cushions at both ends. The riveted SUS304 stainless barrel and aluminium covers yield a shorter mounting envelope than an ISO 6432 unit of the same bore and stroke, resisting mild corrosion and washdown.
Driven by filtered air at 0.15-1.0 MPa through a 1/8" port, the Ø8 mm piston rod delivers 157 N of push force at 0.5 MPa (131.9 N pull). This translates to a safe working load of roughly 94 N, or about 8 kg of vertical lift with a 2:1 margin. The integrated -S magnet supports CMSG, DMSG, and EMSG position switches for changeover automation.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 80 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 MFCJ20X80-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 MFCJ20X80-40S Is Used
Light-Actuation Trial Fits
Ideal for dialing in a precise 40-80 mm extend on delicate tooling, using the adjuster to find the exact contact point without remachining stops.
High-Speed Diverters
Handles rapid package sorting where the variable air cushion quietly absorbs end-of-stroke shock, protecting the 157 N push mechanism from impact wear.
Small-Part Ejection
Provides reliable ejection force for sub-8 kg assemblies, allowing operators to fine-tune the extend distance on the fly during product changeovers.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40S the Right Cylinder?
When sizing this adjustable-stroke family, compare the real thrust figures: this 20 mm bore generates 157 N push at 0.5 MPa, whereas stepping up to the MFCJ25 yields 245.3 N. Choose the 20 mm bore for lighter, high-speed trial fits where the 40 mm on-site stroke window prevents mechanical crashes, and the variable air cushion soaks up end-of-stroke shock. Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code).
Because the -S magnet is present, you can directly fit CMSG/DMSG/EMSG sensors. Remember that the cushion only decelerates the piston near the end of travel—it is not a brake. If the application must hold a load vertically during air loss, add an external rod lock or pilot-operated check valve, as the piston will drift.
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 MFCJ20X80-40S FAQ
This double-acting cylinder uses a 1/8" air port and an Ø8 mm rod (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 of 32 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 40 mm on-site, while the needle-set variable air cushion at both ends decelerates the piston for smooth high-speed stops. The cushion is not a brake; for load holding on air loss, install an external rod lock or pilot check valve. 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.
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