Airtac MKJ Adjustable Cylinder MKJ25X50-40
The AirTAC MKJ Adjustable Cylinder MKJ25X50-40 is a genuine MK multi-mount cylinder (double rod, 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, double rod, 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
- 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 MKJ25X50-40
This AirTAC MKJ is an adjustable-stroke, no-rotating multi-mount cylinder - a compact square body you can fix from any of 6 directions (front, back, left, right, top, bottom) and line up side by side to save panel space. It is double acting with a 25 mm bore, a 50 mm stroke and a 40 mm adjustable range as coded. At 0.5 MPa the bore gives about 245.4 N of theoretical push force, suited to light clamping, gating and positioning tasks. Cushioning is a bumper, magnetic-switch slots surround the body, and the guided design keeps high precision with no added lubricant. Operating medium is 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. Unlike the standard MD family, where the rod may rotate, the MK design uses a fixed rod, no-rotating plate and brass bushing to keep the rod from turning - the right choice when a fitted plate or tool must stay square. This SKU has no trailing S, so it is supplied without a magnet; magnet versions carry the S suffix. Dimensions and sizing for this bore and stroke are confirmed from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ25X50-40 Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ25X50-40 |
|---|---|
| Type | Multi-mount cylinder, double rod, adjustable stroke |
| Series | MK (no-rotating) |
| Bore | 25 mm |
| Push thrust @0.5 MPa | 245.4 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
MKJ is the no-rotating, adjustable-stroke MK variant - double acting, with a 50 mm base stroke plus the adjustable range shown in the code after the hyphen (40 mm here; confirm available ranges from the datasheet). Bore 25 double-acting strokes run up to 60 mm, but the short covers caution against an over-long stroke on a compact body, and allowable side-load must be confirmed with us rather than assumed. Add the S suffix if you need a magnet - this SKU is without one. Thread is PT on this model, with G available as the alternate suffix; the port on bore 25 is M5x0.8.
Applications
Jig positioning in a welding fixture
Positions and supports components inside a welding or assembly jig. The adjustable range lets you fine-travel the setting without changing cylinders, and 6-direction fixing lets the square body sit wherever the fixture frame allows.
Indexing a dial or pallet table
Drives an indexing pin or locator that indexes a rotary table or pallet line. The no-rotating plate and fixed rod keep the pin tracking straight into its bore, stroke after stroke, with the bumper absorbing the seating impact.
Side-mounted small-parts clamp
Clamps light parts where a full-size tie-rod cylinder will not fit. Mounting side by side along a machine rail saves space, and the plate stops the clamp tip from twisting against the part.
FAQ
How much force does the 25 mm bore on the MKJ25X50-40 actually deliver?
Double acting, this bore gives about 245.4 N of theoretical push force and 206.2 N on the pull stroke at 0.5 MPa. The operating pressure range is 0.15-1.0 MPa (22-145 psi), so available force rises toward the top of that range. Speed is 30-500 mm/s for this double-acting variant.
Is there a limit on how long the stroke can be?
For bore 25, double-acting strokes run up to 60 mm, and the compact short-cover construction cautions against specifying an over-long stroke. Keep the stroke within what the body supports, and confirm exact dimensions, adjustable-range options and side-load capability from the datasheet before finalising the layout.