Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 55mm 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
- Stroke55 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 ACEJ20X55-30
The ACEJ20X55-30 is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 55 mm stroke that an external stop screw can trim by up to 30 mm on site, giving a usable extend range of 25-55 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 maximum of 32 kgf at 1.0 MPa. The hard-anodized aluminium body carries magnet slots, and the S45C rod is hard-chrome plated for long seal life.
Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight jigs and guarding where a full-length body will not fit. Plan on roughly 94 N of real work at 0.5 MPa, and for vertical duty it lifts about 8 kg with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke shock, speed spans 30-500 mm/s, and the rod end is female M6x1.0 with an M5x0.8 supply port.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 55 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 ACEJ20X55-30
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -30 | 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 ACEJ20X55-30 Is Used
Fixture clamp trimming
On a small CNC jig, the 30 mm window lets the machinist dial the 55 mm stroke down to 25 mm so the clamp nose lands exactly on a 12 mm aluminium bracket without re-plumbing.
Connector press-fit
Pressing DIN rail terminal blocks into a DIN housing needs about 80 N; the 157.1 N push at 0.5 MPa covers it with margin while the short body fits inside the assembly cell frame.
Light parts elevator
A pick station raising 8 kg trays of vials between two conveyor levels uses the vertical-lift margin of this bore, with the stop screw set so the tray seats level at each dock.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30 the Right Cylinder?
At 157.1 N push (0.5 MPa) this 20 mm bore suits light clamping and part-presenting tasks up to about 94 N of working load. Step down to the 16 mm bore (100.5 N push) for smaller fixtures, or up to the 25 mm bore (245.4 N push) if your jig needs more margin. Remember the stop screw only shortens the extend stroke within the 30 mm window and drifts on air loss, so it is not a load-holding device. FA flange or LB foot mounts bolt to the ISO 21287 face; add the -S code if you later want CMSE / DMSE switch sensing, since this model ships without a magnet.
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 ACEJ20X55-30 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. It is double acting with a 55 mm stroke adjustable down to 25 mm via the 30 mm stop-screw window, runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, M5x0.8 port and female M6x1.0 rod thread.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow guards and gantries. Sensing is not fitted as shipped: the magnet is the optional -S code, so order ACEJ20X55-30S if you want CMSE or DMSE switches on the body slots. FA flange and LB foot mounts bolt straight to the standard face, and the fixed TPU bumpers at both ends absorb end-of-stroke impact without any adjustment.
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