Airtac MKJ Adjustable Cylinder MKJ20X40-40
The AirTAC MKJ Adjustable Cylinder MKJ20X40-40 is a genuine MK multi-mount cylinder (double rod, adjustable stroke), 20 mm bore. Its compact square body fixes from six directions and mounts side by side to save space. It delivers about 157.1 N of push force at 0.5 MPa. A bumper cushions the impact. As an MK unit a fixed rod stops the piston rod rotating.
- TypeMulti-mount, double rod, adjustable stroke
- SeriesMK (no-rotating)
- Bore20 mm
- Push thrust @0.5 MPa157.1 N
- Operating pressure0.15 - 1.0 MPa (22 - 145 psi)
- Port sizeM5x0.8
- CushionBumper
- MagnetWithout magnet
- ThreadPT
- 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 MKJ Adjustable Cylinder MKJ20X40-40
The MKJ20X40-40 is an AirTAC MKJ no-rotating adjustable-stroke multi-mount cylinder with a 20 mm bore and a 40 mm base stroke plus the adjustable range coded after the hyphen. The compact square body fixes from six directions (front, back, left, right, top and bottom) and mounts side by side, saving space on packed machine plates.
This is a genuine AirTAC part. MK variants carry a no-rotating plate, brass bushing and fixed rod that stop the rod turning, unlike the standard MD family where the rod may rotate. This SKU has no trailing S, so it is supplied without a magnet; magnetic-switch slots still surround the body. Materials are typically aluminium alloy, stainless or S45C rod and NBR seals, and we confirm the exact adjustable range and dimensions from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X40-40 Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X40-40 |
|---|---|
| Type | Multi-mount cylinder, double rod, adjustable stroke |
| Series | MK (no-rotating) |
| Bore | 20 mm |
| Push thrust @0.5 MPa | 157.1 N |
| Port size | M5x0.8 (PT thread) |
| Magnet | Without magnet |
| Fluid | Air, filtered to 40 um |
|---|---|
| Operating pressure | 0.15 - 1.0 MPa (22 - 145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature | -20 to 70 C |
| Speed range | 30 - 500 mm/s |
| Cushion | Bumper |
| Mounting | Fix from 6 directions; mountable side by side |
Specifications follow the official AirTAC MD/MK multi-mount data. The front cover and piston are short, so avoid an over-long stroke. An optional high-temperature seal material extends the range to 0 to 150 C. Overall dimensions vary per stroke and allowable side-load is published as curves — ask us and we confirm from the datasheet.
How to choose
MK prevents rod rotation while MD allows it, and acting types span double (MK), single push (MSK), single pull (MTK), double rod (MKD) and adjustable stroke (MKJ). Standard MKJ adjustable ranges are 10, 20 or 30 mm; this SKU is coded -40, so we confirm its exact adjustable range from the datasheet before you order. Thread is PT by default with G available, and the 40 mm stroke sits inside the bore-20 table, which runs to 60 mm - the short cover cautions against over-long strokes, and side-load figures come from the datasheet, so ask us.
Applications
Pick-and-place of small parts
Lifts and drops small components between stations; the compact square bodies sit side by side in a narrow pick head, with the no-rotating rod keeping grippers oriented.
Indexing fixtures
Pushes parts into position at an indexing station; each body fixes from six directions, so one plate carries locating and ejecting cylinders together.
Slide-gate actuation
Opens and closes a small slide gate on a hopper or chute; the fixed rod keeps the gate linkage from rotating as it travels.
FAQ
MKJ20X40-40 has no S at the end - what does that mean?
The trailing letter is the magnet code: no S means this cylinder is supplied without a magnet, while MKJ20X40-40S would include one. MKJ marks the adjustable-stroke version, and the figure after the hyphen is the adjustable range; standard ranges are 10, 20 or 30 mm, and as this SKU is coded 40 we confirm its exact adjustable range from the datasheet.
Where does six-direction mounting pay off?
The square body fixes from the front, back, left, right, top and bottom, so cylinders can be bolted side by side or from odd faces on crowded machine plates. Overall dimensions change with the stroke, so we confirm them from the datasheet on request.