Airtac MDJ Adjustable Cylinder MDJ20X45-20S
The AirTAC Airtac MDJ Adjustable Cylinder MDJ20X45-20S 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 MDJ20X45-20S
The MDJ20X45-20S is a compact square-body multi-mount cylinder that fixes from six directions - front, back, left, right, top and bottom - and mounts side by side to save space. With a 20 mm bore, double-acting operation and a 45 mm stroke plus a 20 mm adjustable range, it delivers about 157.1 N of theoretical push at 0.5 MPa, useful for light clamping and positioning where travel must be trimmed on the machine. Cushioning is a bumper, and magnetic-switch slots run around the body.
This is a genuine AirTAC part. MD is the standard multi-mount family, while the MK family adds a no-rotating plate that stops the rod turning; the trailing S shows this model carries a magnet for switch detection. Dimensions are per stroke, so we confirm overall dimensions and sizing from the datasheet on request.
Airtac MDJ Adjustable Cylinder MDJ20X45-20S Technical Specifications
| Model | Airtac MDJ Adjustable Cylinder MDJ20X45-20S |
|---|---|
| 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
Size the bore for thrust: this 20 mm bore pushes about 157.1 N at 0.5 MPa, while the 25 mm bore reaches 245.4 N. MD permits rod rotation; MK prevents it. Acting types are double acting, single push (MSD), single pull (MTD), double rod (MDD) and adjustable stroke (MDJ). Strokes for the 20 mm bore run up to 60 mm, and this MDJ adds a 20 mm adjustable range on top of the 45 mm base stroke - avoid over-long strokes, as the close-set covers suit compact layouts. The S suffix adds a magnet. Ports are M5x0.8 with PT thread standard and G optional; for side-load limits, ask us and we will check the datasheet.
Applications
Small-parts clamping
Clamp housings, connectors or small castings in a workholder: about 157.1 N of push at 0.5 MPa from the 20 mm bore, with the 20 mm adjustable range absorbing part-height variation.
Pick-and-place slides
Build compact pick-and-place gantries where cylinders stack side by side; the adjustable stroke fine-tunes grip and release positions over the 45 mm base travel.
Height-adjust positioning
Use the 20 mm adjustable range to set a part support or ejector pin height precisely, fixing the square body from the top or bottom of the machine plate.
FAQ
How much adjustable stroke does the MDJ20X45-20S give?
A 45 mm base stroke plus a 20 mm adjustable range on top. MDJ adjustable-stroke cylinders come with 10, 20 or 30 mm ranges, so pick the version that matches the trimming your fixture needs.
Why is a short cover stroke worth noting here?
The multi-mount body is compact, with covers close together, so the bore's stroke table caps travel (up to 60 mm for the 20 mm bore) and very long strokes are best avoided. We confirm exact dimensions and side-load limits from the datasheet.