Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 25mm 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
- Stroke25 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 ACEJ12X25-20B
The ACEJ12X25-20B is a double acting compact cylinder built to ISO 21287, with a 12 mm bore and a 25 mm stroke that an external stop screw can trim on site by up to 20 mm, giving a usable extend range of 5-25 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N / 59.4 N at 0.7 MPa. Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures where a full-length body will not fit.
The hard-anodized aluminium body carries a 6 mm S45C hard-chrome rod with a MALE thread (the B code), and the M5x0.8 port matches this bore size. In practice, plan for roughly 34 N of real work at 0.5 MPa, which lifts about 3 kg vertically with a 2:1 margin - enough for small covers, sensors or light parts. A fixed TPU bumper at each end absorbs end-of-stroke energy, and the optional -S magnet enables CMSE / DMSE switches; without -S no magnet is fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 25 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 ACEJ12X25-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×25 | 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 ACEJ12X25-20B Is Used
Micro part ejection on assembly stations
A 5-25 mm adjustable extend stroke with 56.5 N push at 0.5 MPa flicks small electronic components off a pick point; the male rod thread accepts custom tooling tips directly.
Light clamp on a PCB test jig
About 34 N of usable clamping force holds a circuit board flat against pogo-pin contacts inside a compact test head where a full-length body cannot fit.
Sample pusher in a lab automation module
The 12 mm bore, M5x0.8 port and short ISO 21287 body drive microplate or vial samples between stations at 30-500 mm/s with repeatable end positions.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20B the Right Cylinder?
For this force class, compare carefully: a 16 mm bore reaches 100.5 N push at 0.5 MPa, while stepping down to a 10 mm class is not offered in this series, so the 12 mm is the smallest option. If your load needs more than about 34 N of usable force, move up to the 16 mm bore. The stop screw only shortens the extend stroke and is not a mid-stroke lock - on air loss the piston drifts, so add a valve or external stop if you must hold position. Choose FA flange or LB foot mounting to suit the fixture, and order the -S code if CMSE / DMSE position sensing is needed.
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 ACEJ12X25-20B 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 59.4 N; the theoretical maximum is 11.5 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 25 mm extend stroke by up to 20 mm, so the working range is 5-25 mm. It cannot lengthen the stroke beyond 25 mm, and the stop is not a load-holding brake.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA flange and LB foot options plus I/Y rod knuckles. Position sensing requires the optional -S magnet code; only then can CMSE / DMSE switches be mounted on the body. Without -S there is no magnet. The rod end is male thread (B code) and the port is M5x0.8.
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