Airtac MKJ Adjustable Cylinder MKJ20X45-20S
The AirTAC Airtac MKJ Adjustable Cylinder MKJ20X45-20S 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
- MagnetWith magnet (sensor-ready)
- 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 MKJ20X45-20S
The MKJ20X45-20S is an AirTAC multi-mount cylinder: a compact square body that can be fixed from 6 directions (front, back, left, right, top and bottom) and mounted side by side with neighbouring cylinders to save space. This adjustable-stroke, double-acting no-rotating variant has a 20 mm bore and 45 mm stroke with an added 20 mm adjustable range, delivering about 157.1 N of theoretical push force at 0.5 MPa while the fixed rod and plate stop the rod from turning. Cushioning is provided by a bumper for a simple, reliable end-of-stroke stop.
This is a genuine AirTAC part. The MK family is the no-rotating version of the multi-mount design, while the MD family is the standard type where rod rotation is allowed. This SKU includes the magnet (shown by the trailing S) for magnetic-switch detection. We confirm exact dimensions and sizing from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X45-20S Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X45-20S |
|---|---|
| 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 | With magnet (S) |
| 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 or push load falls within roughly 157.1 N of theoretical thrust at 0.5 MPa. Pick MK when the rod must not rotate - for example where a clamp pad or stopper plate must stay square - and MD when rotation is acceptable. Acting options are double acting, single-acting push, single-acting pull, double rod and adjustable-stroke; this MKJ is double acting with a 10/20/30 mm adjustable range on top of the base stroke. Keep the stroke within the bore 20 table (up to 60 mm) and remember the short cover: an over-long stroke reduces rigidity. Add S for the magnet variant and choose PT or G thread - this SKU is PT. Route side-load questions to us.
Applications
Conveyor gate and stopper
A no-rotating plate keeps the stopper blade square as it rises to divert or hold parts on a narrow conveyor line, with 6-way fixing in tight frame space.
Fixture clamp on small parts
The fixed rod prevents the clamp pad from spinning as it closes on brackets or housings, so the part stays seated and the clamp point stays put.
Jig positioning and indexing
The 20 mm adjustable range lets operators fine-tune the 45 mm advance when locating pallets or workpieces in a jig, with side-by-side mounting in the fixture.
FAQ
What does the -20 at the end of MKJ20X45-20S mean?
It is the adjustable-stroke range: the cylinder has a 45 mm base stroke plus an extra 20 mm of adjustment, so the effective stroke can be set within that range. Adjustable-stroke MKJ models take a 10, 20 or 30 mm adjustable range. The trailing S shows this SKU includes the magnet; a code without S is the non-magnet version.
How does the MK no-rotating design affect mounting?
MK cylinders use a fixed rod and a no-rotating plate to stop the piston rod turning, which suits clamping and stopping where orientation matters. Like all AirTAC multi-mount cylinders, the square body fixes from 6 directions and mounts side by side. For exact overall dimensions per stroke and any side-load limits, confirm from the datasheet.