Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50S 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 ACEJ20X55-50S
A double acting ISO 21287 compact cylinder, the ACEJ20X55-50S carries a 20 mm bore with a 55 mm stroke that an external stop screw can trim anywhere in a 50 mm window, giving a usable extend range of 5-55 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight fixtures, slides and guarding where a full-length body cannot.
For sizing the load, treat roughly 0.6 of the push rating as practical work at 0.5 MPa, so about 94 N of real force is available; that corresponds to lifting roughly 9 kg vertically, or about 4 kg with a 2:1 margin. The hard-anodized aluminium body pairs with an S45C hard-chrome plated 10 mm rod, and fixed TPU bumpers at both ends absorb end-of-stroke energy. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots for end-of-stroke sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50S |
|---|---|
| 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 ACEJ20X55-50S
| 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 ACEJ20X55-50S Is Used
Fixture clamping on CNC jigs
Trims the 55 mm stroke down to hold small machined aluminium or brass parts against a jig stop, with about 94 N of practical clamping force at 0.5 MPa.
Position-verified ejector on small assembly stations
The fitted -S magnet and CMSE / DMSE switches confirm extend and retract on electronics assembly lines, while the stop screw sets the exact eject distance.
Bottle and carton press-fit station
Pushes caps or plugs into small cosmetic and pharma containers with 157.1 N at 0.5 MPa, adjustable between 5 and 55 mm to suit different product heights.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50S the Right Cylinder?
Check the load both ways before ordering. If 157.1 N push at 0.5 MPa is more than you need, the ACEJ16X55-50S at 100.5 N saves space and air; if the load is heavier, step up to the ACEJ25X55-50S with 245.4 N push at the same pressure. Remember the stop screw is a mechanical end stop for the extend stroke only - it is not a mid-stroke lock, so on air loss the piston can still drift and the load must be supported independently.
Mounting drops onto the standard ISO 21287 face: FA flange or LB foot brackets, plus I and Y rod knuckles. The fitted -S magnet works with CMSE / DMSE switches; without the S code there is no magnet. Ports are M5x0.8, female rod thread M6x1.0, PT body ports.
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 ACEJ20X55-50S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The -50 code gives a 50 mm adjustment window, so the extend stroke can be trimmed from the full 55 mm down to 5 mm with the external stop screw. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the rod is a 10 mm hard-chrome S45C rod with female M6x1.0 thread.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow slides, guards and gantries. A fixed TPU bumper at each end absorbs end-of-stroke energy. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots; FA flange, LB foot, FTC brackets and I/Y rod knuckles bolt straight to the standard face.
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