Airtac MDJ Adjustable Cylinder MDJ20X50-40S
The AirTAC Airtac MDJ Adjustable Cylinder MDJ20X50-40S is a genuine MD 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.
- TypeMulti-mount, adjustable stroke
- SeriesMD (standard)
- 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 MDJ Adjustable Cylinder MDJ20X50-40S
The MDJ20X50-40S is an AirTAC multi-mount cylinder: a compact square-body, double-acting cylinder that can be fixed from six directions (front, back, left, right, top and bottom) and mounted side by side to save space. With a 20 mm bore it develops about 157.1 N of theoretical push force at 0.5 MPa, and its 50 mm stroke carries the 40 mm adjustable range shown in the code, so end positions can be set precisely. Cushioning is a bumper, and the built-in magnet works with the magnetic-switch slots around the body for end-position feedback.
This is a genuine AirTAC part from the MD family, the standard multi-mount series in which rod rotation is not prevented (the MK family stops rod rotation). As the SKU shows, the trailing S means a magnet is included. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s, from -20 to 70 C. We confirm exact dimensions and sizing from the datasheet on request.
Airtac MDJ Adjustable Cylinder MDJ20X50-40S Technical Specifications
| Model | Airtac MDJ Adjustable Cylinder MDJ20X50-40S |
|---|---|
| Type | Multi-mount cylinder, adjustable stroke |
| Series | MD (standard) |
| 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 sets the force: at 0.5 MPa this 20 mm bore pushes about 157.1 N (the pull side is lower), while 25 mm gives 245.4 N and 32 mm gives 402.1 N if you need more. Choose MD if the rod may rotate, or MK if rotation must be prevented. Acting options are MD double acting, MSD/MSK single push, MTD/MTK single pull, MDD/MKD double rod, and MDJ/MKJ adjustable stroke. A 20 mm bore runs strokes up to 60 mm; this model pairs a 50 mm stroke with the 40 mm adjustable range shown in the code. The trailing S includes a magnet; the thread is PT as shown, with G available as an option. The compact covers caution against over-long strokes - route side-load and exact dimensions to us.
Applications
Adjustable stopper on indexing tables
The 40 mm adjustable range dials in the exact stop height, and the magnet reports end-of-stroke to the controller for each index cycle.
Small-parts clamping with position sensing
The 157.1 N push at 0.5 MPa clamps small parts in a fixture, and the built-in magnet confirms the clamp is fully closed before the next step.
Conveyor gate with end-position feedback
Fixed from the top or side of a conveyor frame, the gate diverts or stops product while the magnet signals cylinder position to the PLC.
FAQ
What is the difference between MDJ and MKJ on these multi-mount cylinders?
Both are adjustable-stroke versions, but MDJ belongs to the standard MD family, where the rod is free to rotate, while MKJ belongs to the MK no-rotating family, where a plate and fixed rod stop the rod turning. Pick MKJ when the load must not twist; MDJ suits jobs where rotation is harmless.
Where can I fix this cylinder, and what limits the mounting?
The square body can be fixed from six directions - front, back, left, right, top and bottom - and cylinders sit side by side to save space. The allowable side load and exact overall dimensions depend on the stroke, so confirm them from the datasheet or ask us before finalising the mounting.