Airtac MDJ Adjustable Cylinder MDJ20X40-40S
The AirTAC MDJ Adjustable Cylinder MDJ20X40-40S is a genuine MD 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.
- TypeMulti-mount, double rod, 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 MDJ20X40-40S
The AirTAC MDJ20X40-40S is a multi-mount cylinder - a compact square-body pneumatic cylinder that can be fixed from six directions: front, back, left, right, top and bottom. Mount several side by side and you save panel space, with magnetic-switch slots already provided around the body and high guide precision needing no added lubricant. This adjustable-stroke, double acting model has a bore 20 piston with a 40 mm stroke and an adjustable range on top of it. At 0.5 MPa it produces a theoretical push thrust of 157.1 N, operates on 0.15-1.0 MPa (22-145 psi) of air filtered to 40 um at 30-500 mm/s, and is cushioned by a bumper. The trailing S in the model code means a magnet is built in, so magnetic switches fitted in the body slots can signal piston position.
It is a genuine AirTAC part from the MD family of standard multi-mount cylinders, where a little rod rotation is tolerated; if your application needs the rod or plate to stay rotationally fixed, look at the MK no-rotating family instead. Typical construction is aluminium-alloy body, covers and piston, stainless or S45C rod, NBR seals and a TPU bumper, with an M5x0.8 PT air port. Dimensions change with stroke and adjustable range, so we confirm exact sizing from the datasheet on request.
Airtac MDJ Adjustable Cylinder MDJ20X40-40S Technical Specifications
| Model | Airtac MDJ Adjustable Cylinder MDJ20X40-40S |
|---|---|
| Type | Multi-mount cylinder, double rod, 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
Stay with MD if rod rotation is acceptable; choose MK if rotation must be prevented. On acting type, MDJ is the double acting adjustable-stroke variant - plain MD is fixed-stroke double acting, MSD/MSK are single acting push, MTD/MTK single acting pull, and MDD/MKD double rod. Bore 20 double-acting strokes go up to 60 mm; this code's hyphen suffix sets the adjustable range on top of the 40 mm stroke, and we confirm the exact setting limits from the datasheet. The S at the end means the magnet is fitted - drop the S for an unmagnetized unit. Thread is PT as standard with G available. Respect the short-cover caution by keeping strokes well inside the bore's table, and send side-load questions to us.
Applications
Pick-and-place transfer in a compact gantry
Drives the vertical or horizontal lift on a small pick-and-place head; the built-in magnet lets switches confirm up and down positions, and the square body bolts into any of six faces of a crowded gantry.
Slide-open gate on a hopper or chute
Opens and closes a sliding gate to release or hold product; the adjustable stroke sets exactly how far the gate travels, and six-way fixing suits mounting under a hopper where only one face is accessible.
Fine-position jog adjustment on a fixture
Nudges a workpiece or idler into final position before clamping; the adjustable stroke lets operators dial in the travel, and the magnet gives a position signal for the machine controller.
FAQ
Does the S on MDJ20X40-40S mean it has a magnet?
Yes. The trailing S means a magnet is built into the piston, so magnetic switches seated in the slots around the square body can detect piston position. The same bore and stroke ordered without the S (MDJ20X40-40) comes without a magnet. The magnet is an option on this range, never an automatic inclusion, so pick the code that matches your sensing plan.
How long a stroke can I run on this bore 20 cylinder?
Bore 20 double-acting cylinders are offered up to 60 mm of stroke, and the covers are designed for strokes within that table - the standard cover is short, so avoid stretching toward the maximum without checking first. Dimensions depend on the stroke and adjustable range, and allowable side load is not listed here, so confirm both from the datasheet or ask us before finalizing the layout.