Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 20mm 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
- Stroke20 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 ACEJ12X20-20B
A double acting compact actuator built to ISO 21287, the ACEJ12X20-20B pairs a 12 mm bore with a 20 mm stroke that an external stop screw can trim anywhere in a 20 mm window, giving a usable extend range of 0-20 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N and 59.4 N at 0.7 MPa, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim pick-and-place heads and fixture plates where a full-length body cannot fit.
Because the -20 window is set with a stop screw on the outside of the body, you can dial in the exact extend position during commissioning without swapping cylinders. The male rod thread (B code) ends in a 6 mm rod with M3x0.5 female thread removed - the B option gives an external male thread for direct nut fixing. The hard-anodized aluminium body carries a hard-chromed S45C rod, and a fixed TPU bumper at each end softens end-of-stroke contact. As a rule of thumb, plan on roughly 34 N of real work (about 3 kg lifted vertically with a 2:1 margin) rather than the full 56.5 N rating.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 20 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 ACEJ12X20-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×20 | 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 ACEJ12X20-20B Is Used
Micro part ejection from nests
The 56.5 N push at 0.5 MPa is enough to strip tiny stamped or moulded parts off a locating nest, and the 0-20 mm adjustable range lets you match the eject travel exactly to the nest depth.
Compact presence-check stations
In a 12 mm bore class gauge or presence-check fixture, the short ISO 21287 body fits inside tight guard envelopes; order the -S code if the station later needs CMSE or DMSE switch feedback.
Small connector lid pressing
With about 34 N of practical working force (roughly 3 kg vertical lift equivalent), the male-threaded 6 mm rod takes a nut-fixed press pad for snapping lids onto small electrical connectors.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20B the Right Cylinder?
At 12 mm bore this is the smallest ACEJ size: 56.5 N push at 0.5 MPa versus 100.5 N for a 16 mm bore and 157.1 N for a 20 mm bore, so step up if your clamp or lift needs more than about 34 N of working force. The 20 mm stroke sits well inside the 50 mm maximum standard stroke for this bore, so it is a catalogue item, not a made-to-order length. The male thread (B) suits nut-retained tooling; choose the plain female rod thread if your linkage bolts directly into the rod. No magnet is fitted on this code - if you need CMSE or DMSE switch position feedback, order the -S variant. FA flange or LB foot mounts bolt to the standard ISO 21287 face. Remember the stop screw sets the extend end position only; on air loss the piston can still drift, so it is not a load lock.
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 ACEJ12X20-20B FAQ
At 0.5 MPa the 12 mm bore delivers 56.5 N push and 42.4 N pull; at 0.7 MPa that rises to 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s. The extend stroke is adjustable from 0-20 mm via the external stop screw within the -20 window, and the maximum standard stroke for this bore is 50 mm.
The ACEJ12X20-20B is an ISO 21287 compact cylinder: hard-anodized aluminium body, S45C hard-chromed 6 mm rod, threaded aluminium covers, and a fixed TPU bumper at each end that only decelerates at the ends of travel. The body is about 50% shorter in mounting length than an ISO 15552 profile cylinder. This code has no magnet, so no sensor can be read from it - order the -S option to enable CMSE or DMSE reed or solid-state switches. Mounting is via the standard ISO 21287 face with FA flange or LB foot options, and the B code gives a male rod thread.
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