Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 45mm 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
- Stroke45 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 ACEJ12X45-20S
The ACEJ12X45-20S is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. A stop screw trims the 45 mm stroke by up to 20 mm on site, giving a usable range of 25-45 mm, and the -S code means the position magnet is already fitted for CMSE / DMSE switches. At 0.5 MPa the 12 mm bore pushes 56.5 N and pulls 42.4 N, rising to 79.2 N at 0.7 MPa.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures where a full-length body will not fit. Plan for roughly 34 N of real work at 0.5 MPa, which is about 3 kg of vertical lift with a 2:1 margin - enough for small caps, sensors or light covers. A fixed TPU bumper at each end absorbs end-of-stroke energy, and the hard-anodized aluminium body with S45C hard-chrome rod resists wear.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACEJ12X45-20S Is Used
Ejector on a small assembly station
Trims the 45 mm stroke down to 25 mm to kick light plastic caps off a fixture without retuning the PLC timing.
Position-verified micro press
The fitted magnet drives a CMSE switch so the controller confirms the 56.5 N push actually reached the trimmed stop.
Slide actuation in a compact gauge
The short ISO 21287 body fits inside a bench-top checking fixture where an ISO 15552 profile cylinder would overhang.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20S the Right Cylinder?
At 56.5 N push at 0.5 MPa this bore suits light clamping and positioning; step up to the 16 mm bore (100.5 N) if the load grows, or drop to a direct ACE fixed-stroke unit when no trimming is needed. The adjuster is a mechanical end stop only - it shortens the extend stroke and does not lock the piston if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet accepts CMSE / DMSE switches for end-of-stroke detection.
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 ACEJ12X45-20S 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. The theoretical maximum is 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, and speed runs 30-500 mm/s.
The -20 code sets a 20 mm window: an external stop screw shortens the extend stroke anywhere between 25 and 45 mm. The TPU bumper at each end is fixed and only decelerates at the ends - it never holds a load. Because this model carries the -S option, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be clamped into the body slots.
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