Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20 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 ACEJ12X25-20
The ACEJ12X25-20 is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa (79.2 N / 59.4 N at 0.7 MPa), with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -20 code means an external stop screw trims the 25 mm stroke down by up to 20 mm on site, giving a usable extend range of 5-25 mm without changing the cylinder.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures, small gates and compact pick stations. At 0.5 MPa plan on roughly 34 N of usable push, which lifts about 2.9 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a 6 mm S45C hard-chrome rod with a female M3x0.5 thread, a fixed TPU bumper sits at both ends, and the port is M5x0.8. Note: this unit has no magnet, so CMSE / DMSE switches cannot be used unless you order the -S version.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20 |
|---|---|
| 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 ACEJ12X25-20
| 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 ACEJ12X25-20 Is Used
Micro part clamping
Holds small electronics or watch components in a slim test fixture, with the stroke trimmed between 5 and 25 mm to match part height.
Compact ejector on small assemblies
Pushes light plastic caps off a nest on a bench-top assembly station where a full-length cylinder will not fit.
Small lift-and-lower probe
Raises and lowers a lightweight sensor probe of about 2.9 kg vertically at 0.5 MPa in a quality inspection rig.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20 the Right Cylinder?
For light clamping and positioning under about 34 N of real working force, the 12 mm bore is the right size; if the load rises, step up to the 16 mm bore (100.5 N push at 0.5 MPa) or the 20 mm bore (157.1 N). The stop screw only shortens the extend stroke and is not a mid-stroke lock, so the piston still drifts if air is lost. FA flange or LB foot mounts bolt to the standard ISO 21287 face. If position detection is needed later, order the -S magnet code 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 ACEJ12X25-20 FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push is 79.2 N and pull 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 25 mm stroke adjustable down to 5 mm via the -20 stop screw, running on air filtered to 40 um at 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, M5x08 port (M5x0.8), female M3x0.5 rod thread, PT ports, and a fixed TPU bumper at both ends.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, ideal for tight jigs and guards. FA flange and LB foot mounts fit the standard face. This model has no magnet, so no CMSE / DMSE switch can be fitted; choose the -S magnet option if sensing is required.
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