Airtac MKJ Adjustable Cylinder MKJ20X40-10
The AirTAC Airtac MKJ Adjustable Cylinder MKJ20X40-10 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 MKJ20X40-10
The MKJ20X40-10 is a compact square-body multi-mount cylinder from AirTAC's no-rotating MK family. It can be fixed from six directions - front, back, left, right, top and bottom - so units sit side by side to save space, with magnetic-switch slots machined around the body. This double-acting unit has a 20 mm bore giving a theoretical 157.1 N push at 0.5 MPa (131.9 N pull), runs 30-500 mm/s and cushions with a bumper, with a 10 mm adjustable range added on the 40 mm stroke.
This is a genuine AirTAC part. Unlike the standard MD family, MK cylinders add a no-rotating plate, bushing and fixed rod so the piston rod cannot turn. This SKU carries no magnet (no trailing S); add S to the code if you need magnetic-switch detection. Medium is air filtered to 40 um, working pressure 0.15-1.0 MPa for this bore, temperature -20 to 70 C (0-150 C only with the optional high-temperature seals). We confirm dimensions and sizing from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X40-10 Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X40-10 |
|---|---|
| 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
Start with bore for thrust: this 20 mm bore delivers 157.1 N push and 131.9 N pull at 0.5 MPa in double-acting service, at 30-500 mm/s with a bumper cushion. Pick MK over MD when rotation must be prevented - the fixed rod and no-rotating plate stop the rod turning, while standard MD allows it. The J suffix adds a 10/20/30 mm adjustable range; this unit carries 10 mm. Keep the stroke within the bore's table (double-acting bore 20 tops out at 60 mm) and beware over-long strokes that leave a short cover - route side-load questions to us. This code has no magnet; the S option adds one, and the M5x0.8 port takes PT (blank) or G thread.
Applications
Conveyor gate stopper
A pop-up stopper that halts small parts on a conveyor line. The no-rotating plate keeps the gate face aligned with product flow, and the 10 mm adjustable range trims the stop position in place.
Jig positioning on assembly fixtures
Positioning a part against a nest before fastening. The six-direction body fixing lets the cylinder clamp to the jig from below where space is tight, and units line up side by side on multi-nest jigs.
Vertical labeling press
A short downstroke that presses a label or datum pin onto a part. The fixed rod stops the pad rotating so the mark stays straight, with the bumper giving a controlled stop at the bottom.
FAQ
Does MKJ20X40-10 include a magnet for switch detection?
No. Without the trailing S this SKU comes without a magnet, and AirTAC fits magnets only as ordered. If you want position detection, select the S version; the body always has magnetic-switch slots around it.
How long a stroke should I run on a 20 mm multi-mount cylinder?
Double-acting bore 20 models go up to 60 mm. Very long strokes leave a short cover at full extension, so stay within the table and avoid pushing the limit where you do not need to. Allowable side-load and exact dimensions should be taken from the datasheet.