Airtac MKJ Adjustable Cylinder MKJ20X25-20
The AirTAC Airtac MKJ Adjustable Cylinder MKJ20X25-20 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 MKJ20X25-20
The MKJ20X25-20 is an AirTAC multi-mount cylinder: a compact square-body double-acting actuator that fixes from six directions (front, back, left, right, top and bottom) and mounts side by side where space is tight. As an MKJ adjustable-stroke model it adds a 20 mm adjustment range to the 25 mm base stroke, giving flexible end-position setting on the machine. At 20 mm bore, double acting, it produces a theoretical push force of 157.1 N at 0.5 MPa, cushioned by a bumper, with magnetic-switch slots around the body and high guide precision (no added lubricant required).
This is a genuine AirTAC part from the MK family: a no-rotating plate, bushing and fixed rod stop the piston rod from turning, in contrast to the standard MD family where rotation is allowed. The SKU carries no trailing S, so it is listed without a magnet; add the S version if position sensing is needed. We can confirm dimensions and sizing from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X25-20 Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X25-20 |
|---|---|
| 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
The 20 mm bore suits jobs needing roughly 157.1 N theoretical push at 0.5 MPa double acting, with a lower pull-side force. Take MK rather than MD when the rod must not rotate. MKJ gives double-acting operation with an adjustable stroke: here a 25 mm base plus a 20 mm adjustable range, comfortably inside the bore 20 double-acting table that reaches 60 mm. This SKU is the non-magnetic version (choose the S suffix for a magnet) with PT thread on M5x0.8 ports; G thread is offered. Remember the compact cover suits shorter strokes, so avoid over-stroking, and check side-load capability with us first.
Applications
Small-parts clamping
Bolted from the side or bottom of a workholder, the 20 mm bore clamps small parts, and the no-rotating rod keeps the clamp pad from twisting under load.
Jig positioning
On assembly or machining jigs, cylinders mounted side by side act as adjustable positioners, with the 20 mm adjustment range covering part-to-part variation.
Indexing pusher
Fixed through the machine frame, the square body pushes parts between indexing stations on a small conveyor, the non-rotating rod holding the pusher plate true.
FAQ
How much force does the 20 mm bore of MKJ20X25-20 deliver?
Double acting at 0.5 MPa, the push side gives a theoretical 157.1 N and the pull side somewhat less. It runs on 0.15-1.0 MPa (22-145 psi) filtered air at 30-500 mm/s, cushioned by a bumper. For this SKU, no trailing S means no magnet is fitted, and ports are PT thread on M5x0.8.
What stops the rod from rotating, and how far can the stroke go?
In the MK family, a no-rotating plate, bushing and fixed rod prevent the piston rod from turning, which matters for pushers and clamp pads that must stay aligned. The adjustable stroke lets you set the end position within the 20 mm range on top of the 25 mm base stroke, but the compact cover favors short strokes, so confirm exact dimensions and side-load limits from the datasheet.