Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 30mm 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
- Stroke30 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
About the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20
Dial in exact extend distances on-site with the AirTAC MFCJ40X30-20, a JIS-standard round-body mini cylinder featuring a 20 mm adjustable stroke window and variable air cushions at both ends. Built with a SUS304 stainless barrel and riveted aluminium covers, it is shorter than an ISO 6432 cylinder for the same bore and stroke, resisting mild corrosion in tight machinery. This double-acting 40 mm bore unit delivers 628.3 N of push force at 0.5 MPa and uses a 1/4" port.
The needle cushions absorb high-speed end-of-stroke shock for quiet, smooth cycling between 30 and 800 mm/s. With a safe working load of about 377 N, it lifts roughly 32 kg vertically with a 2:1 margin. Note this SKU lacks a magnet (-S) and cannot take CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 MFCJ40X30-20
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MFCJ40X30-20 Is Used
Stroke Tuning Jigs
Micro-adjust the 20 mm extend window during trial fits to perfectly seat components without re-mounting the cylinder.
High-Speed Ejectors
Leverage the 628.3 N push force and variable air cushion to eject parts rapidly while softening the end impact.
Compact Press Fits
Fit the shorter-than-ISO-6432 body into tight cells to execute light press operations with smooth deceleration.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X30-20 the Right Cylinder?
When sizing a 40 mm bore against the smaller MFCJ32 (402.2 N push at 0.5 MPa), this MFCJ40 provides superior thrust at 628.3 N, making it the better choice for heavier high-speed changeovers. The 20 mm adjustable window is perfect for trial fits where the exact extend position and end shock both need tuning.
Mount using LB foot, FA flange, or TC trunnion brackets (no SDB or back-cover option exists on this build). Because this is a non-magnet SKU, position sensing is unavailable. Remember that the air cushion only decelerates the piston; it does not lock the load. Fit an external rod lock or pilot check valve if you need to hold position vertically during air loss.
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 MFCJ40X30-20 FAQ
This 40 mm bore double-acting cylinder pushes 628.3 N and pulls 527.8 N at 0.5 MPa. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N, with a theoretical max of 128.1 kgf at 1.0 MPa. It features a 1/4" port, a 16 mm rod, and an M14x1.5 male rod thread.
This specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG switches. The variable air cushion at both ends uses a needle valve to decelerate the piston near stroke end, absorbing high-speed shock without acting as a load lock.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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