Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50 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 ACEJ20X55-50
The ACEJ20X55-50 is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 55 mm stroke that can be trimmed on site by up to 50 mm. An external stop screw shortens the extend stroke within the ordered -50 window, giving a usable range of 5-55 mm, so one cylinder can be tuned to several station depths without reordering. 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 short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs, guarding and gantries. For sizing, plan on roughly 94 N (about 9.6 kgf) of real work at 0.5 MPa, or expect it to lift about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries an S45C hard-chrome plated rod, fixed TPU bumpers sit at both ends, and speed runs 30-500 mm/s. Note this unit has no magnet: order the optional -S code if you later need CMSE / DMSE switch position sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50 |
|---|---|
| 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 ACEJ20X55-50
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -50 | 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 ACEJ20X55-50 Is Used
Small-part press fitting
A 157.1 N push at 0.5 MPa seats dowel pins or snap fits in electronics fixtures, and the 50 mm window lets one cylinder serve several fixture depths.
Adjustable end-stop gating
On packaging lines the stop screw trims the extend stroke from 55 mm down to 5 mm, so the same unit gates different carton heights without changing hardware.
Lab and test station actuation
The compact body fits bench-top test rigs where a full-length profile cylinder will not, lifting sample holders of about 8 kg with a 2:1 vertical margin.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50 the Right Cylinder?
Check the load both ways before committing. If 157.1 N of push at 0.5 MPa is marginal, step up to the 25 mm bore (245.4 N push at 0.5 MPa); if you need far less force, the 16 mm bore (100.5 N push at 0.5 MPa) saves more space. The stop screw only sets the extend end position - it is not a mid-stroke lock, so the rod will still drift if air is lost. Mount with FA flange or LB foot on the ISO 21287 face, add I or Y rod knuckles where side alignment matters, and remember the female M6x1.0 rod thread and M5x0.8 ports when piping. If position feedback may be needed later, order the -S magnet version now.
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 ACEJ20X55-50 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The -50 code is a 50 mm adjustment window: an external stop screw shortens the 55 mm extend stroke by up to 50 mm, so the usable range is 5-55 mm. It shortens the stroke only - it never extends it past 55 mm, and it is a mechanical end stop, not a load-holding lock.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits tight jigs and guards. Fixed TPU bumpers at both ends absorb end-of-stroke energy. FA flange and LB foot mountings plus I/Y rod knuckles bolt to the standard ISO 21287 face, and the rod end is female M6x1.0 with M5x0.8 ports. This model has no magnet fitted; order the optional -S code to enable CMSE / DMSE switches for position sensing.
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