Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20S 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 ACEJ20X55-20S
A double acting ISO 21287 compact cylinder, the ACEJ20X55-20S pairs a 20 mm bore with a 55 mm stroke that an external stop screw trims by up to 20 mm on site, giving a usable extend range of 35-55 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa, 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 fixtures a full-length body cannot reach.
The hard-anodized aluminium body carries a S45C hard-chrome plated 10 mm rod, and a fixed TPU bumper at each end absorbs end-of-stroke energy. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped anywhere along the body slots for end-of-travel signals. As a rule of thumb, plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20S |
|---|---|
| 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 ACEJ20X55-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | 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 ACEJ20X55-20S Is Used
Fixture clamping on CNC jigs
The 35-55 mm trim range lets a machinist dial in exact clamp travel on aluminium jigs, with 157.1 N of push at 0.5 MPa holding light parts steady through the cut.
Small-part diverting on packaging lines
A stop screw set to 40 mm kicks cartons or blister packs off a conveyor at 30-500 mm/s, and the fitted magnet feeds CMSE switch signals back to the PLC.
Sample press in lab automation
About 8 kg of vertical lift with a 2:1 margin suits capping or pressing microplate trays inside compact analyzer frames where a profile cylinder will not fit.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20S the Right Cylinder?
Size both ways before committing: the 16 mm bore delivers 100.5 N push at 0.5 MPa, while the 25 mm bore steps up to 245.4 N, so this 20 mm bore at 157.1 N sits squarely in the middle for light clamping and indexing. Remember the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet accepts CMSE / DMSE switches without reordering.
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 ACEJ20X55-20S FAQ
This 20 mm bore unit pushes 157.1 N and pulls 117.8 N at 0.5 MPa, and 219.9 N / 164.9 N at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke: the stop screw trims the 55 mm stroke by up to 20 mm, so the working range is 35-55 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, air filtered to 40 um, and the port is M5x0.8 with a female M6x1.0 rod thread.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange or LB foot mounts bolt straight to its face. This model already carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches mount in the body slots for end-of-travel detection. A fixed TPU bumper at each end absorbs end-of-stroke energy; it never locks or holds a load, so use external stops for position holding.
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