Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10B 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 ACEJ20X55-10B
The ACEJ20X55-10B is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 55 mm stroke by up to 10 mm on site, giving a usable range of 45-55 mm without changing the cylinder. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa. The male (B code) rod thread bolts straight to tooling, and the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding.
In practice, plan for roughly 94 N of real work at 0.5 MPa, and expect the rod to lift about 8 kg vertically once a 2:1 margin is applied. The hard-anodized aluminium body carries a 10 mm S45C hard-chrome rod, a fixed TPU bumper decelerates the piston at each end, and speed spans 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). This unit has no magnet; order the optional -S code if CMSE / DMSE switch sensing is needed later.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10B |
|---|---|
| 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 ACEJ20X55-10B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -10 | 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 ACEJ20X55-10B Is Used
Small-part ejection from injection molds
The 157.1 N push at 0.5 MPa is enough to kick light molded clips off the tool, and the 45-55 mm adjustable range lets the molder dial eject travel to the part depth.
Indexing stop on a rotary dial table
Extended as a retractable stop for small housings on a 400 mm dial, the stop screw trims the stroke so the stop face lands exactly on the fixture datum.
Light press-fit of bushings
About 94 N of usable work force seats nylon or aluminum bushings in electronics enclosures, with the male rod thread picking up a custom press ram directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10B the Right Cylinder?
Size by force: a 16 mm bore gives 100.5 N push at 0.5 MPa, while a 25 mm bore reaches 245.4 N, so the 20 mm bore at 157.1 N sits between them for light clamping and positioning. If the load must stay put during a pause, remember the stop screw only limits the extend stroke and does not hold the piston on air loss. FA flange or LB foot mounts and I/Y rod knuckles fit the ISO 21287 face; add the -S code at order time if position switches are planned.
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 ACEJ20X55-10B 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 -10 code means the 55 mm extend stroke can be shortened by up to 10 mm via the external stop screw, so the working range is 45-55 mm. The B code gives a male rod thread and the port is M5x0.8.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange or LB foot brackets plus I/Y rod knuckles bolt to the standard face. Sensing is not fitted on this model: the magnet is the optional -S code, and only with -S can CMSE / DMSE switches be mounted along the body slots.
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