Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
- 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 MFJ Adjustable Mini Cylinder MFJ40X20-10
Trimming the extend stroke by up to 10 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in the exact end position without buying a new unit or adding external stops. The SUS304 stainless steel barrel and riveted aluminium covers form a compact riveted body that is physically shorter than a comparable ISO 6432 cylinder for the same 40 mm bore and 20 mm stroke, saving valuable mounting length while resisting mild washdown.
Driven by a 16 mm rod through a 1/4" port, the 40 mm bore delivers 628.3 N of push force at 0.5 MPa. That translates to a safe working load of roughly 377 N, or lifting about 32 kg vertically with a 2:1 safety margin. The retract stroke remains full length, and fixed TPU bumper pads absorb the impact at the end of travel.
Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | Fixed TPU bumper pads |
| 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 MFJ Adjustable Mini Cylinder MFJ40X20-10
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MFJ Adjustable Mini Cylinder MFJ40X20-10 Is Used
Changeover Stations
Fine-tune the 10 mm extend window during product line changeovers to set new end positions rapidly without swapping out the entire cylinder.
Trial-Fit Rigs
Leverage the 628.3 N push force to press or locate parts during prototype builds, adjusting the stroke on the fly until the exact fit is confirmed.
Variable-Position Stops
Use the shorter JIS body in tight assembly cells to actuate stops, relying on the fixed TPU bumpers to cushion the impact at each adjusted end point.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10 the Right Cylinder?
When sizing this adjustable family, compare the two available bores directly: the MFJ32 provides 402.2 N of push force at 0.5 MPa, whereas this MFJ40 steps up to 628.3 N. Choose the 40 mm bore when your trial-fit rig or changeover station needs that extra thrust to move the load. The external adjuster is ideal for line changeovers where the exact extend position is not yet finalised, letting you fine-tune the 10 mm window on the fly.
Mounting options include LB foot, FA flange, and TC trunnion (there is no SDB mount or back-cover code for this build). Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors. Note that the TPU bumper only decelerates the stroke end; the piston will drift on air loss, so fit an external rod lock or pilot check valve if you need to hold a suspended load.
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 MFJ Adjustable Mini Cylinder MFJ40X20-10 FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 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 extend stroke by up to 10 mm on site, giving a usable extend range of 10 to 20 mm, while retract remains full. Fixed TPU bumpers decelerate the stroke end but do not act as a lock; the piston drifts on air loss, so use an external rod lock for holding. This SKU lacks the -S magnet and cannot take sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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