Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 50mm 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
- Stroke50 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 ACEJ12X50-20
The ACEJ12X50-20 is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. A 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa (79.2 N push at 0.7 MPa), and an external stop screw trims the 50 mm stroke anywhere within the ordered 20 mm window, giving a usable range of 30-50 mm. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures, small guards and slim gantries.
For sizing, plan on roughly 34 N of usable push at 0.5 MPa (about 60% of the rated figure), 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 at each end absorbs end-of-stroke energy, and speeds run 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). Note: this version has no magnet, so position sensing needs the optional -S code with CMSE / DMSE switches.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 50 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 ACEJ12X50-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 ACEJ12X50-20 Is Used
Micro press fixture
Light staking and marking on small electronics housings where 56.5 N at 0.5 MPa is enough and the 30-50 mm adjustable stroke lets one cylinder serve several part heights.
Small part ejection
Pushing coins, caps or terminals off a narrow conveyor lane; the compact body fits where a full-length profile cylinder would overhang the frame.
Test station actuator
Toggling a limit lever or sample holder in a bench-top tester, with the optional -S magnet enabling CMSE / DMSE switches for end-position confirmation.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20 the Right Cylinder?
Check the load first: at 0.5 MPa this bore pushes 56.5 N, enough for light clamping and small part ejection, but step up to the 16 mm bore (100.5 N push) if the load is near 40 N or higher. If 56.5 N is far more than needed, the 20 mm stroke of the ACEJ12X20-20 keeps the same force in a shorter body. The stop screw only shortens the extend stroke within the 20 mm window and is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face; add the -S code if CMSE / DMSE switch sensing is planned.
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 ACEJ12X50-20 FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push rises to 79.2 N and pull to 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 50 mm extend stroke by up to 20 mm, so the working range is 30-50 mm. It shortens the stroke only and acts as an end stop, 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 a hard-anodized aluminium body, 6 mm hard-chrome rod, fixed TPU bumpers at both ends and an M5x0.8 port. FA flange and LB foot mounts fit the standard face. Sensing is not included: order the optional -S magnet version to run CMSE / DMSE switches; this model without -S has no magnet.
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