Airtac MKJ Adjustable Cylinder MKJ25X40-30S
The AirTAC Airtac MKJ Adjustable Cylinder MKJ25X40-30S 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 MKJ25X40-30S
The MKJ25X40-30S is a compact AirTAC multi-mount cylinder that fixes from six directions - front, back, left, right, top and bottom - and can be mounted side by side with further units to save space. Magnetic-switch slots run around the body, guide precision is high without added lubrication, and the cushion is a bumper for end-of-stroke damping. In double-acting service the 25 mm bore delivers a theoretical push force of 245.4 N at 0.5 MPa, and the adjustable-stroke format adds a 30 mm range on top of the 40 mm base stroke.
This is a genuine AirTAC part in the MK family: a no-rotating plate, brass bushing and fixed rod stop the piston rod from turning, unlike the standard MD family where rotation is allowed. The trailing S shows this SKU is fitted with a magnet for position sensing. Medium is air filtered to 40 um, proof pressure is 1.5 MPa (215 psi), and the temperature range is -20 to 70 C, rising to 0-150 C only with the optional high-temperature seal material. Typical materials include an aluminium-alloy body and covers, a stainless or S45C rod and NBR seals; route exact dimensions and bore-specific detail to the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ25X40-30S Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ25X40-30S |
|---|---|
| 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
Choose the 25 mm bore where the job needs the bore's 245.4 N theoretical push at 0.5 MPa on the push side. MK versus MD is the rotation decision: this MKJ prevents rod rotation, MD permits it. Double-acting operation runs at 0.15-1.0 MPa and 30-500 mm/s, and the J format adds a 10/20/30 mm adjustable range - here 30 mm over the 40 mm base. Double-acting strokes for this bore reach 60 mm, and the short covers caution against over-long strokes; if side-load is present in your design, confirm limits with us from the datasheet. The S suffix means the magnet is included; PT thread is the default with G available as the alternative.
Applications
Compact part pressing
Presses or seats small components in an assembly jig, where the 245.4 N push at 0.5 MPa suits light press-fitting and the 30 mm adjustable range tunes the pressing depth.
Wide workpiece clamping
Claamps wide panels by driving several cylinders side by side on a shared rail, with the six-way multi-mount fixing aligning to the rail and the magnet enabling clamped-position sensing.
Orientation-critical handling
Extends and retracts an orientation-critical gripper or probe where rod rotation must be prevented, relying on the MK no-rotating plate and fixed rod to hold alignment cycle after cycle.
FAQ
How do I choose between the MKJ25X40-30S and a standard MD cylinder?
Both share the multi-mount six-way fixing, but the MKJ's no-rotating plate and fixed rod stop the piston rod from turning, which matters when tooling must stay square. The standard MD allows rotation. Both double-acting bores of 25 mm give the same 245.4 N theoretical push at 0.5 MPa, so the decision is rotation, not force.
What should I check before running this cylinder at a long stroke?
The multi-mount body has short covers, so over-long strokes are best avoided; keep within the 60 mm maximum for this 25 mm bore in double-acting service. For exact stroke-dependent dimensions and any side-load your mechanism applies, confirm the figures from the datasheet or ask us before ordering.