Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20B 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 ACEJ20X50-20B
A double acting compact cylinder built to ISO 21287, the ACEJ20X50-20B pairs a 20 mm bore with a 50 mm stroke and a male-threaded 10 mm rod (the B code). At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. The hard-anodized aluminium body with an S45C hard-chrome-plated rod keeps the footprint tight: it saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into shallow jigs and guarding where a full-length body will not fit.
The -20 code adds a 20 mm adjustment window: an external stop screw trims the extend stroke anywhere between 30 and 50 mm on site, no disassembly needed. Plan on roughly 94 N (about 9.6 kg) of usable working force at 0.5 MPa, which corresponds to lifting around 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke impact, and the optional -S magnet enables CMSE / DMSE switches if position sensing is added later.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20B |
|---|---|
| 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 ACEJ20X50-20B
| 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 ACEJ20X50-20B Is Used
Small-part ejector on assembly fixtures
The 157.1 N push at 0.5 MPa is enough to kick stamped terminals or molded caps off a nest, and the 30-50 mm adjustable stroke lets the operator dial the eject distance per part changeover.
Light press-fit of bushings and dowels
With about 94 N of practical working force at 0.5 MPa, the 20 mm bore seats small bushings into plastic housings, while the male-threaded rod accepts custom press tips directly.
Indexing slide in a compact test rig
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so the slide fits inside a benchtop vision-check station; add the -S magnet later for CMSE / DMSE end-position signals.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20B the Right Cylinder?
Compare both directions before committing: the smaller 16 mm bore delivers 100.5 N push at 0.5 MPa, while the 25 mm bore reaches 245.4 N, so 20 mm sits between them for light clamping and indexing. Remember the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock - on air loss the rod still drifts, so add a separate holding valve if the load must stay put. Mounting options include FA flange and LB foot plus I/Y rod knuckles on the standard ISO 21287 face; order the -S code if you need the magnet for 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 ACEJ20X50-20B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. The base stroke is 50 mm and the -20 stop screw trims the extend stroke down to 30 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the port is M5x0.8.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, threaded aluminium covers, an S45C hard-chrome rod with male thread (B code), and a fixed TPU bumper at both ends. FA flange and LB foot mountings bolt to the standard face. Switches are not possible on this unit as ordered: the magnet comes only with the optional -S code, which then accepts CMSE / DMSE switches.
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