Airtac MKJ Adjustable Cylinder MKJ20X80-30
The AirTAC Airtac MKJ Adjustable Cylinder MKJ20X80-30 is a genuine MK multi-mount cylinder (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, 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 MKJ20X80-30
The MKJ20X80-30 is an AirTAC MKJ adjustable-stroke multi-mount cylinder: a compact square-body, double-acting cylinder with a 20 mm bore that can be fixed from 6 directions (front, back, left, right, top and bottom) and mounted side by side with neighbours to save panel space. Being an MK-family unit, its rod is held against rotation by a fixed rod and no-rotating plate, so the tooling at the rod end stays square to the body. At 0.5 MPa the bore delivers about 157.1 N of theoretical push force, and the cushioning is a bumper.
This is a genuine AirTAC part. MKJ is the adjustable-stroke version of the no-rotating MK family (standard multi-mount cylinders without rotation control are the MD series), and this SKU is without a magnet and has PT thread as standard. It operates on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi) between -20 and 70 C, or up to 150 C with the optional high-temperature seal material. Overall dimensions vary with stroke, so we confirm sizing from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X80-30 Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X80-30 |
|---|---|
| Type | Multi-mount cylinder, 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
Choose the 20 mm bore when your clamp, stopper or positioning job needs roughly the 157.1 N theoretical push at 0.5 MPa that this size delivers; move to bore 25 for about 245.4 N or down to bore 16 for about 100.5 N. MKJ gives you a base stroke plus an adjustable range (here 30 mm) so the end position can be fine-tuned without changing cylinders; confirm the exact stroke options for this bore in the datasheet. Pick MK over MD only when the rod must not rotate - MD is the standard version if some rotation is acceptable. Acting here is double acting (single-push MSK, single-pull MTK, double-rod MKD also exist). This SKU has no magnet (add S for magnetic-switch readiness) and PT thread; G thread is available. Note that short covers mean very long strokes should be checked against the datasheet, and send us any side-load questions.
Applications
Indexing on a conveyor line
Mounted side by side along a transfer line, the no-rotating rod keeps an indexing paddle or gate plate facing the same way every stroke, so parts are advanced in consistent orientation.
Gate and stopper stations
Bolted from the top or side of a fixture, the bumper-cushioned rod extends and retracts a part stopper without twisting, holding parts square at the machine entry point.
Jig positioning in welding fixtures
Fixed from any of 6 directions inside a cramped jig, the adjustable stroke lets the operator dial in the exact rest position for a locating block, with the plate staying flush against the work.
FAQ
What does the -30 in MKJ20X80-30 mean?
MKJ is the adjustable-stroke version of the no-rotating MK multi-mount cylinder. The code decodes as bore 20 mm, 80 mm stroke, with a 30 mm adjustable range added on top, so the effective end position can be trimmed. Confirm exact stroke options for this bore in the datasheet.
How does the no-rotating feature help when mounting from 6 directions?
Because the cylinder can be fixed from the front, back, left, right, top or bottom, it often ends up in tight, odd orientations. The fixed rod and no-rotating plate stop the rod from turning, so brackets, stoppers and plates stay aligned no matter which way the body is bolted. Side-load limits and dimensions are in the datasheet - we can confirm them.