Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 50mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. Its short compact envelope saves about 50% of the mounting length of an ISO 15552 profile cylinder.
- BoreØ12 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S
The ACEJ12X50-20S is a double acting ISO 21287 compact cylinder with a 12 mm bore and a 50 mm stroke that an external stop screw trims on site: the -20 window lets you set the extend stroke anywhere from 30 to 50 mm without changing the cylinder. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N on the extend stroke at 0.7 MPa, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarding where a full-length body simply will not fit.
For sizing the load, treat roughly 0.6 of the push force as usable work at 0.5 MPa, which is about 34 N, and the vertical-lift equivalent works out to roughly 3 kg, or about 1 kg with a 2:1 margin. The hard-anodized aluminium body carries a 6 mm S45C hard-chrome rod with a female M3x0.5 thread, an M5x0.8 air port, and a fixed TPU bumper at each end to absorb end-of-stroke shock. Because the -S magnet is fitted on this model, CMSE or DMSE reed and solid-state switches can be clamped anywhere along the body slots to report end positions.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed TPU bumper (both ends) |
| Max standard stroke | Up to 50 mm |
Specifications follow the official AirTAC ACE-series (ISO 21287) datasheet. Body: hard-anodized aluminium alloy; piston rod: S45C carbon steel with hard-chrome plating. Rod type: female thread (blank) or male thread (B). Thread options: PT (blank) / G. A built-in magnet is OPTIONAL — add the -S code to fit CMSE / DMSE position sensors.
Theoretical Output Force (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 57 N | 42 N |
| 0.7 MPa | 79 N | 59 N |
| Max (@1.0 MPa) | 12 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| S | Optional built-in magnet for CMSE / DMSE sensors (omit for no magnet). |
| B | Rod type: B = male thread; blank = female thread. |
ACE-family variants: ACE (double acting), ASE / ATE (single acting push / pull), ACED (double rod), ACEJ (adjustable stroke), TACE / TACED (non-rotating twin-guide yoke). Mounting accessories: FA / FB flange, LB foot, CA / CB clevis, CR, SDB pivot, FTC; plus I and Y knuckles. Thread PT (blank) / G.
Where the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S Is Used
PCB test fixture clamping
The 30-50 mm adjustable window lets a technician dial in the exact clamp travel for different board thicknesses, while the fitted magnet confirms the closed position via a CMSE switch.
Lab sample ejector
About 3 kg of vertical-lift equivalent at 0.5 MPa is enough to eject light vials or slides from a tray, and the compact body fits inside a benchtop enclosure.
Small-batch label kick-off
A 56.5 N push at 0.5 MPa nudges misaligned cartons off a narrow conveyor lane, with the stroke trimmed to the lane width using the stop screw.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S the Right Cylinder?
Pick this model when your clamp or position move needs under about 34 N of real work at 0.5 MPa and the final stroke must be tuned after installation: the stop screw shortens the 50 mm stroke by up to 20 mm, never lengthens it. If your load is heavier, step up to the 16 mm bore (100.5 N push at 0.5 MPa) or the 20 mm bore (157.1 N); if 56.5 N is generous, the same bore in fixed-stroke ACE form is the simpler choice. The adjuster is a mechanical end stop only, so on air loss the piston can still drift and it must not be relied on to hold a load. Mounting brackets from the FA flange and LB foot family bolt straight to the ISO 21287 face, and the fitted -S magnet means CMSE / DMSE switches are ready to add. Speed range is 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short stroke fits the compact body
- ✓ Port/thread type (PT / G)
- ✓ Add -S if you need the magnet for sensors
- ✓ Rod type (female / male B) & mount (FA/LB/CA)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Compact body: keep the stroke short and avoid side load on the rod.
- check Do not dismantle the threaded front/back covers.
- check Keep speed within the rated range; the TPU bumper absorbs stroke-end energy.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20S FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push is 79.2 N and pull is 59.4 N; theoretical maximum is 11.5 kgf at 1.0 MPa. It is double acting with a 12 mm bore, 50 mm stroke adjustable down to 30 mm via the -20 stop screw, M5x0.8 port, female M3x0.5 rod thread, 6 mm rod, speed 30-500 mm/s, operating pressure 0.15-1.0 MPa (22-145 psi) and proof pressure 1.5 MPa (215 psi).
An external stop screw mechanically limits the extend stroke anywhere within the ordered 20 mm window, so the effective range is 30-50 mm; it shortens travel only and acts as an end stop, not a mid-stroke lock or brake. The fixed TPU bumper at each end absorbs end-of-stroke shock. This model carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches can be mounted in the body slots for position sensing.
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