Airtac MKJ Adjustable Cylinder MKJ20X50-40S
The AirTAC MKJ Adjustable Cylinder MKJ20X50-40S is a genuine MK multi-mount cylinder (double rod, 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, double rod, 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
- 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 MKJ20X50-40S
The MKJ20X50-40S is an AirTAC multi-mount cylinder from the no-rotating MK family: a compact square body that fixes from six directions (front, back, left, right, top and bottom) and mounts side by side to save space. This double acting unit carries a 20 mm bore, a 50 mm stroke plus a 40 mm adjustable range, and about 157.1 N theoretical push at 0.5 MPa. Cushioning is a bumper, the medium is air filtered to 40 um, proof pressure is 1.5 MPa (215 psi), and operation spans -20 to 70 C (0 to 150 C only with the optional high-temperature seal material). Magnetic-switch slots surround the body and the guide runs with high precision and no added lubricant.
This is a genuine AirTAC part. The S in the code means a magnet is fitted, so magnetic switches can sense piston position in the body slots. A fixed rod, no-rotating plate and brass bushing stop the rod from turning, which is what sets the MK range apart from the standard MD series. We can confirm dimensions and sizing from the datasheet on request.
Airtac MKJ Adjustable Cylinder MKJ20X50-40S Technical Specifications
| Model | Airtac MKJ Adjustable Cylinder MKJ20X50-40S |
|---|---|
| Type | Multi-mount cylinder, double rod, adjustable stroke |
| Series | MK (no-rotating) |
| Bore | 20 mm |
| Push thrust @0.5 MPa | 157.1 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
Bore 20 double acting delivers 157.1 N theoretical push at 0.5 MPa (131.9 N pull). Pick MD if rod rotation is acceptable; pick this MK no-rotating version when the rod or plate must not turn. The trailing S means a magnet is included - drop the S if you do not need switch sensing. Bore 20 double acting strokes go up to 60 mm; this SKU is 50 mm with a 40 mm adjustable range, and the short covers argue against an over-long stroke. Thread is PT as standard, with the G suffix available. Route side-load and exact dimensions to the datasheet or ask us.
Applications
Pick-and-place lifting
The magnet signals stroke-end in the body slots for plc feedback, while the no-rotating rod keeps the gripper plate oriented during vertical lifts.
Indexing fixture positioning
A 40 mm adjustable range sets the index stop precisely, and the compact body fits between neighbouring fixtures mounted side by side.
FAQ
What does the S in MKJ20X50-40S mean?
The trailing S means this cylinder is supplied with a magnet, so magnetic switches can be fitted in the slots around the body to detect piston position. Without the S the cylinder has no magnet. The same code otherwise reads as: MKJ no-rotating adjustable-stroke family, 20 mm bore, 50 mm stroke, 40 mm adjustable range, PT thread standard.
How do I mount it and what should I check first?
The multi-mount body fixes from six directions - front, back, left, right, top and bottom - and units can sit side by side to save space. Overall dimensions depend on the stroke, so confirm them from the datasheet, and check allowable side-load with us before applying lateral loads to the rod.