Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-30
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-30 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 MFCJ20X40-30
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ20X40-30, a JIS-standard round-body mini cylinder. The external adjuster shortens the extend stroke by up to 30 mm on-site, giving a usable 10-40 mm window, while the needle-set variable air cushion at both ends ensures smooth deceleration. Driven by an 8 mm rod through a 1/8" port, it delivers 157 N push force at 0.5 MPa.
Built with a SUS304 stainless steel barrel and riveted aluminium covers, this double-acting unit resists mild corrosion and washdown. Its riveted construction is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. This non-magnet SKU cannot take a sensor; adding the -S variant enables CMSG/DMSG/EMSG switches. With a safe working load around 94 N, it lifts about 8 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-30 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-30 |
|---|---|
| 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 MFCJ20X40-30
| 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 MFCJ20X40-30 Is Used
Light-Part Trial Fits
Use the 30 mm extend adjuster to dial in exact contact points during short-stroke changeovers without remachining stops.
High-Speed Diverter
Leverage the variable air cushion to silently halt the 8 mm rod at high speeds while pushing lightweight packages.
Lab Pick-and-Place
Ideal for shifting loads under 94 N safely, tuning the extend end on the fly for delicate sample handling.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X40-30 the Right Cylinder?
When sizing this 20 mm bore, compare it directly against the MFCJ25 which provides 245.3 N push at 0.5 MPa. Choose the MFCJ20X40-30 when your changeover requires both a tuned extend stop and end-of-stroke shock absorption at high speeds. The 30 mm adjustable window is perfect for trial fits where the exact extend position is unknown.
Remember that the air cushion only decelerates the piston near the end of travel; it is not a brake. If the machine loses air, the piston drifts, so fit an external rod lock or pilot check valve to hold a suspended load. Mount using LB foot, FA flange, or TC trunnion brackets, as there is no SDB or back-cover option on this adjustable build.
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 MFCJ20X40-30 FAQ
This 20 mm bore cylinder uses a 1/8" port and an 8 mm rod. 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 max of 32 kgf at 1.0 MPa.
No, this specific SKU lacks a magnet and cannot take a switch. You must select the -S variant to use CMSG, DMSG, or EMSG sensors. The external adjuster only shortens the extend stroke within the 30 mm window and does not lock mid-stroke.
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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