Airtac MKJ Adjustable Cylinder MKJ25X50-40S
The AirTAC Airtac MKJ Adjustable Cylinder MKJ25X50-40S is a genuine MK multi-mount cylinder (adjustable stroke), 25 mm bore. Its compact square body fixes from six directions and mounts side by side to save space. It delivers about 245.4 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)
- Bore25 mm
- Push thrust @0.5 MPa245.4 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 MKJ25X50-40S
The MKJ25X50-40S is an adjustable-stroke, no-rotating multi-mount cylinder from AirTAC: a compact square body that fixes from 6 directions - front, back, left, right, top and bottom - and mounts side by side with neighbours to save space. It is double acting with a 25 mm bore, a 50 mm stroke and a 40 mm adjustable range as coded, delivering about 245.4 N of theoretical push force at 0.5 MPa for light clamping, stopping and positioning jobs. Cushioning is a bumper, magnetic-switch slots run around the body, and the guided design achieves high precision without added lubrication. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to 70 C (0-150 C only with the optional high-temperature seal material).
This is a genuine AirTAC part from the MK family, whose fixed rod, no-rotating plate and brass bushing stop the rod from turning - the standard MD family instead allows rotation. The trailing S means this SKU comes with a magnet, which lets the switch slots detect position along the stroke. Body dimensions for this bore and stroke, plus sizing help, are confirmed from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ25X50-40S Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ25X50-40S |
|---|---|
| Type | Multi-mount cylinder, adjustable stroke |
| Series | MK (no-rotating) |
| Bore | 25 mm |
| Push thrust @0.5 MPa | 245.4 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
Force first: the 25 mm double-acting bore gives 245.4 N push and 206.2 N pull at 0.5 MPa. MKJ is the no-rotating, adjustable-stroke member of the MK family - double acting, 50 mm base stroke, with the adjustable range coded after the hyphen (40 mm here; confirm available ranges from the datasheet). Bore 25 double-acting strokes run up to 60 mm, but avoid stretching the stroke beyond what the short covers support - an over-long stroke on a compact body is a frequent mis-selection, and side-load must be confirmed with us. The S suffix here means the magnet is included; drop it for a without-magnet unit. Thread is PT on this model (G is the alternate suffix), with an M5x0.8 port on this bore.
Applications
Light press or press-fit station
Applies short, controlled travel to seat a bearing, bushing or label anvil. The no-rotating plate keeps the tooling face square to the part, and the bumper cushions the end of the press stroke.
Gate stopper beside a transfer line
Extends a stop face to hold cartons or trays at a work station. Fixing from the top or bottom of the square body suits tight conveyor frames, and side-by-side mounting lines up multiple stoppers on one rail.
Escapement and small-parts clamp on a feeder
Clamps or releases parts in a feeder bowl or escapement where space is minimal. The 6-way fixing and compact body tuck the cylinder into the mechanism, while the fixed rod and plate stop the clamp tip from turning.
FAQ
Does MKJ25X50-40S include a magnet?
Yes. The trailing S in the model code means this SKU is supplied with a magnet, which works with the magnetic-switch slots around the body for end or mid-stroke position detection. The magnet is an option, not a fixed feature - the same cylinder without the S suffix is supplied without one.
Where do I get dimensions and side-load figures for this cylinder?
Overall dimensions depend on the bore and stroke combination, so they are given per model in the datasheet rather than as a single specification, and the same applies to allowable side-load. Confirm both from the datasheet for your exact stroke, or ask us and we will pull the figures for your layout.