Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20
The ACEJ20X50-20 is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw trims on site. The -20 code gives a 20 mm adjustment window, so the extend stroke can be set anywhere from 30 to 50 mm without changing hardware. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarded cells. In practice, plan for roughly 94 N of usable push at 0.5 MPa, and expect it to lift about 8 kg vertically once a 2:1 margin is applied. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, a fixed TPU bumper sits at each end, and the optional -S magnet enables CMSE / DMSE switches - this unit has no magnet fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| 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 100 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | 165 N |
| Max (@1.0 MPa) | 32 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 ACEJ20X50-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | 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 ACEJ20X50-20 Is Used
Small-parts ejection from plastic molds
A 30-50 mm adjustable push clears finished clips or caps off a mold face; 157.1 N at 0.5 MPa handles light ejection pins without oversizing the tool.
Clamping on a benchtop drilling fixture
Roughly 94 N of practical clamping force holds aluminum brackets against a drill jig, and the stop screw lets one cylinder serve several part heights.
Reject pusher on a packaging line
The compact body fits beside a narrow conveyor, kicking off underweight cartons within the 30-500 mm/s speed range.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 the Right Cylinder?
Compare both directions before committing: the smaller ACEJ16 bore delivers 100.5 N push at 0.5 MPa, while the ACEJ25 steps up to 245.4 N. If your tooling needs more than about 94 N of working force, stay with the 20 mm bore. The stop screw only shortens the extend stroke and drifts on air loss, so it is not a load holder. FA flange or LB foot mounts bolt to the ISO 21287 face, and ordering the -S version adds the magnet for CMSE / DMSE sensing.
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 ACEJ20X50-20 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push reaches 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. The 50 mm stroke is trimmed by the stop screw within the -20 window, giving a usable extend range of 30-50 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the air port is M5x0.8 with a female M6x1.0 rod thread.
The ISO 21287 body is about 50% shorter in mounting length than an ISO 15552 profile cylinder, with a hard-anodized aluminium barrel and an S45C hard-chrome rod. A fixed TPU bumper at each end absorbs end-of-stroke impact only - it never locks or holds a load. FA flange and LB foot mounts fit the standard face, and the optional -S magnet allows CMSE / DMSE switch mounting; without it no sensor can be attached.
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