Airtac MDJ Adjustable Cylinder MDJ20X40-40
The AirTAC MDJ Adjustable Cylinder MDJ20X40-40 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
- MagnetWithout magnet
- 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 MDJ20X40-40
The AirTAC MDJ20X40-40 is a multi-mount cylinder: a compact square-body pneumatic cylinder that fixes from six directions - front, back, left, right, top and bottom - and mounts side by side with other cylinders to save space. Magnetic-switch slots run around the body, and guide precision is high with no added lubricant required. This is the adjustable-stroke, double acting version: bore 20 with a 40 mm stroke and an adjustable range on top of it. At 0.5 MPa it gives a theoretical push thrust of 157.1 N (131.9 N on the pull side), runs on 0.15-1.0 MPa (22-145 psi) of air filtered to 40 um at 30-500 mm/s, and cushions with a bumper.
This is a genuine AirTAC part. The MDJ belongs to the MD family of standard multi-mount cylinders, where some rod rotation is acceptable; the parallel MK family adds a no-rotating plate for jobs where the rod must not turn. This SKU is supplied without a magnet - the trailing-S version of the same bore and stroke adds one. Typical materials are an aluminium-alloy body, piston and covers, a stainless or S45C rod, NBR seals and a TPU bumper, with an M5x0.8 PT port. We confirm exact dimensions and sizing from the datasheet on request.
Airtac MDJ Adjustable Cylinder MDJ20X40-40 Technical Specifications
| Model | Airtac MDJ Adjustable Cylinder MDJ20X40-40 |
|---|---|
| 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 | Without magnet |
| 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
Within the multi-mount range, MD is the standard cylinder where rod rotation is allowed; pick MK (or its variants) if rotation must be prevented. For acting type, MDJ is double acting with an adjustable stroke on top of its base stroke; 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 run up to 60 mm, and the hyphen suffix on this code sets the adjustable range - we confirm the exact setting limits from the datasheet. This SKU carries no magnet (order the S version if you need switch detection) and uses a PT thread; a G thread is available. Mind the short-cover caution: keep the stroke within the bore's table rather than stretching toward the maximum, and route any side-load question to us.
Applications
Adjustable conveyor stopper
Stops parts at an exact point on a conveyor line; the adjustable stroke lets the stop face be set precisely without shims, and the square body fixes from any of six directions inside a tight conveyor frame.
Small-parts clamping in tight cells
Works as a compact clamp inside assembly cells where space is scarce; the bumper cushion and six-way fixing let it be bolted top, bottom or side, whichever the cell layout allows.
FAQ
What does the -40 suffix on MDJ20X40-40 mean?
On MDJ adjustable-stroke cylinders the figure after the hyphen is the adjustable stroke range applied on top of the base stroke, so the effective stroke can be set rather than being fixed at 40 mm. Because adjustable ranges are offered in set steps, we confirm this code's exact adjustable range and setting limits from the datasheet before you order.
How does the six-direction mounting help my installation?
The square body fixes from front, back, left, right, top or bottom, so you can bolt it whichever way the machine layout demands, and several cylinders can be mounted side by side to save space, with magnetic-switch slots already machined around the body. Overall dimensions vary with stroke and the allowable side load is not published here, so confirm both from the datasheet or ask us.