Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S is a genuine double acting, double rod, 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, double rod, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
- 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 ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S
The ACEJ12X25-20S is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: a 12 mm bore, a 25 mm stroke and a 20 mm adjustment window, so the stop screw lets you trim the extend stroke anywhere from 5 to 25 mm on site. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight fixture plates and small guarding frames. As an -S model the magnet is fitted, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots for end-of-stroke sensing.
The hard-anodized aluminium body carries a hard-chrome plated S45C rod with a female M3x0.5 thread, a fixed TPU bumper at each end absorbs end-of-stroke shock, and the air supply runs at 0.15-1.0 MPa (22-145 psi) with speeds of 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 25 mm |
| Acting type | Double acting, double rod, 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 42 N |
| 0.7 MPa | 59 N |
| Max (@1.0 MPa) | 9 kgf |
ACEJ is double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S
| 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 (double rod, 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 ACEJ12X25-20S Is Used
Position-confirm ejection in test rigs
The fitted -S magnet lets a CMSE switch signal full extension, so an electronics test bench can verify the part was pushed home into its nest before the probe cycle starts.
Sample pusher in lab automation
The short ISO 21287 body fits inside compact analysis enclosures, and the adjustable stroke lets a technician dial the pusher travel to slide vials between stations.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20S the Right Cylinder?
Remember the stop screw only shortens the extend stroke within the 20 mm window - it is a mechanical end stop, not a mid-stroke lock, so the rod will drift if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet pairs with CMSE / DMSE switches.
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 ACEJ12X25-20S FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N; theoretical maximum is 11.5 kgf at 1.0 MPa. It is double acting with a 25 mm stroke adjustable down to 5 mm via the 20 mm window, air supply 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, M5x0.8 port and a female M3x0.5 rod thread.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits where space is tight. FA flange and LB foot brackets bolt to the standard face, and because this is an -S model the magnet is fitted, so CMSE / DMSE reed or solid-state switches can be slid into the body slots. A fixed TPU bumper at each end absorbs end-of-stroke shock.
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