Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 70mm 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
- Stroke70 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 ACEJ20X70-20
A double acting compact actuator built to ISO 21287, the ACEJ20X70-20 pairs a 20 mm bore with a 70 mm stroke that an external stop screw can trim on site by up to 20 mm, giving a usable extend range of 50-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical ceiling of 32 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 tight jigs and guarded stations where a full-length body will not fit.
Practically, plan on roughly 94 N of real work at 0.5 MPa (about 60% of the push rating), which means this unit lifts around 9 kg vertically once you keep a 2:1 margin - enough for small fixtures, gates and part trays. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, fixed TPU bumpers absorb end-of-stroke shock at both ends, and the optional -S magnet enables CMSE / DMSE switches; without that code no magnet is fitted. Speed range is 30-500 mm/s across 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 70 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 ACEJ20X70-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 ACEJ20X70-20 Is Used
Small-part ejection from plastic molds
The 157.1 N push at 0.5 MPa is enough to kick finished caps or bushings off a mold nest, and the 50-70 mm adjustable range lets the operator tune the eject position without changing the cylinder.
Reagent tray indexing on lab automation lines
Compact 20 mm bore bodies fit inside benchtop analyzer frames, and the trimmed stroke positions sample trays repeatably at speeds from 30-500 mm/s.
Carton flap tucking on a packaging bench
With about 9 kg of vertical lift capability at a 2:1 margin, this cylinder folds light flaps and holds boxes square before taping, using the FA flange for rigid face mounting.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20 the Right Cylinder?
At 20 mm bore this sits mid-range: the 16 mm bore delivers 100.5 N push at 0.5 MPa for lighter clamping, while the 25 mm bore raises it to 245.4 N when your fixture needs more grip. If the load must stay put on air loss, remember the stop screw only shortens the extend stroke - it is not a mid-stroke lock, so add a valve or external stop for holding. FA flange and LB foot mountings bolt to the standard ISO 21287 face, and ordering the -S variant adds the magnet needed for CMSE / DMSE position 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 ACEJ20X70-20 FAQ
This 20 mm bore unit pushes 157.1 N and pulls 117.8 N at 0.5 MPa; at 0.7 MPa it reaches 219.9 N push and 164.9 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. The extend stroke is adjustable from 50-70 mm via the external stop screw (20 mm window). 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, with a 10 mm rod, M6x1.0 female rod thread and M5x0.8 ports.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow fixtures and guarded gantries. Sensing is optional: order the -S code to have the magnet fitted so CMSE or DMSE switches can read position; this model (no S code) carries no magnet. Mounting is via FA flange or LB foot on the standard face, and fixed TPU bumpers at both ends absorb end-of-stroke impact without any adjustment.
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