Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-10B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-10B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 ACEJ20X50-10B
The ACEJ20X50-10B is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw can trim by up to 10 mm, giving a usable extend range of 40-50 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight fixtures and guarding where a full-length body simply will not fit.
The male rod thread (B code) ends in a 10 mm S45C hard-chrome rod, and the M5x0.8 port feeds air filtered to 40 um over a 0.15-1.0 MPa (22-145 psi) band at 30-500 mm/s. Plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which lifts about 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke energy, and the optional -S magnet enables CMSE / DMSE switches - without the -S code there is no magnet fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-10B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-10B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 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 ACEJ20X50-10B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-10B Is Used
Small-parts ejection in plastic molding
A 157.1 N push at 0.5 MPa is enough to kick finished clips or bushings off a mold table, and the 40-50 mm adjustable window lets the operator dial the eject distance to the part.
Bench-top test station clamping
Lab and QC benches clamp sample boards or connectors with about 94 N of usable force, and the compact body fits under a low gantry where a full-length profile cylinder cannot.
Packaging line product diverting
On a snack-carton conveyor, the 50 mm stroke (trimmable to 40 mm) nudges boxes onto a reject lane at up to 500 mm/s, matching typical sorter cycle rates.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-10B the Right Cylinder?
Right-size by force: the 16 mm bore gives 100.5 N push at 0.5 MPa, while stepping up to the 25 mm bore takes you to 245.4 N - pick the 20 mm when your load sits between those two. 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. Bolt FA flange or LB foot mounts straight to the ISO 21287 face, and if you need position sensing, order the -S variant so CMSE / DMSE switches can be used.
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 ACEJ20X50-10B 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 20 mm bore 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, with a M5x08 port - written M5x0.8 - and a 10 mm male rod thread. The -10 code means the 50 mm extend stroke can be shortened by up to 10 mm via the external stop screw.
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 jigs and guarded spaces. A fixed TPU bumper at both ends absorbs end-of-stroke energy. FA flange, LB foot and FTC brackets plus I/Y rod knuckles bolt to the standard face. Position sensing needs the optional -S magnet: order ACEJ20X50-10SB-S style codes with -S and CMSE / DMSE switches can be mounted; without -S there is no magnet in the piston.
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