Airtac MDJ Adjustable Cylinder MDJ20X40-20S
The AirTAC Airtac MDJ Adjustable Cylinder MDJ20X40-20S 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 MDJ20X40-20S
This AirTAC MDJ multi-mount cylinder is a compact square-body actuator that can be fixed from six directions - front, back, left, right, top and bottom - and mounted side by side with its neighbours to save space. With a 20 mm bore, 40 mm stroke and a built-in 20 mm adjustable-stroke range, it delivers about 157.1 N of theoretical push thrust at 0.5 MPa (the pull side is slightly lower) as a double-acting unit running at 30-500 mm/s. Cushioning is a bumper, and magnetic-switch slots are machined around the body so sensors sit flush with the profile.
This is a genuine AirTAC part from the standard MD family, where rod rotation is allowed, unlike the no-rotating MK series. The trailing S in the model code means this SKU includes the position-magnet option; SKUs without S omit it. We are happy to confirm dimensions, exact weight and sizing details from the AirTAC datasheet on request before you order.
Airtac MDJ Adjustable Cylinder MDJ20X40-20S Technical Specifications
| Model | Airtac MDJ Adjustable Cylinder MDJ20X40-20S |
|---|---|
| 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
Choose the bore for the thrust you need: this 20 mm bore gives about 157.1 N theoretical push at 0.5 MPa, between the 16 mm (100.5 N) and 25 mm (245.4 N) options. MD is the standard double-acting family; pick MK instead if the rod must not rotate, or MSD/MTD for single-acting push/pull. The 40 mm stroke sits comfortably within the 60 mm maximum for bore 20, and the MDJ version adds a 20 mm adjustable range on top of the main stroke, set in 10, 20 or 30 mm options at ordering. Trailing S adds the magnet; PT thread is default, or choose G. Keep strokes moderate so the covers stay short - and route any side-load question to us to confirm from the datasheet.
Applications
Small-parts clamping on fixtures
Mounted side by side along a machining or assembly fixture, this 20 mm bore cylinder clamps small parts with about 157.1 N of push thrust at 0.5 MPa while the adjustable stroke fine-tunes the clamp travel.
Jig positioning stations
The six-direction mounting lets engineers bolt the cylinder into the exact face a jig layout demands, using the 40 mm stroke plus 20 mm adjustment to position workpieces precisely before processing.
Compact pick-and-place module
In tight pick-and-place heads where space is scarce, the square body mounts flush against neighbouring components, and the magnet supports end-of-stroke detection for the transfer cycle.
FAQ
What does the -20S in MDJ20X40-20S mean?
The code decodes as MDJ (adjustable-stroke double acting), 20 mm bore, 40 mm stroke, then -20 for the 20 mm adjustable range on top of the main stroke, and S for the built-in position magnet. Without the S the cylinder has no magnet; PT thread is the default, G is optional.
Can I use a long stroke on this 20 mm bore?
Bore 20 MD cylinders are offered up to 60 mm stroke, but longer strokes mean longer covers, which reduces the space-saving benefit and can be awkward where the body must stay compact. Keep the stroke modest for your layout, and ask us to confirm exact dimensions from the datasheet.