Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20S 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 ACEJ20X50-20S
A double acting ISO 21287 compact cylinder, the ACEJ20X50-20S pairs a 20 mm bore with a 50 mm stroke that an external stop screw trims anywhere in a 20 mm window, giving a usable extend range of 30-50 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into small pick-and-place heads and fixture clamps where a full-length body simply will not fit.
The S in the code means the optional -S magnet is fitted, so CMSE or DMSE reed and solid-state switches can be slid into the body slots to flag end positions. In practice, plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which is enough to lift about 8 kg vertically with a 2:1 margin. A hard-anodized aluminium body, S45C hard-chrome plated rod and fixed TPU bumpers at both ends keep it running at 30-500 mm/s from -20 to +70 C.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20S |
|---|---|
| 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 ACEJ20X50-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-20S Is Used
Fixture clamp with trimmed stroke
On a small CNC jig, the stop screw is set to 38 mm so the clamp plate lands on the part without over-travel, using the 157.1 N push at 0.5 MPa to hold light aluminium housings.
Pick-and-place lift of small parts
A compact gantry head lifts connector blocks of about 8 kg or less vertically, with the short body keeping the Z axis stack low inside the machine guard.
End-position signalling on an indexer
With the fitted -S magnet, CMSE switches on the body confirm full seat of each pallet on a rotary indexing table, while the TPU bumper quiets each stop.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20S the Right Cylinder?
For this 20 mm bore, drop to a 16 mm bore (100.5 N push at 0.5 MPa) for lighter gauge checks, or step up to 25 mm (245.4 N push) when clamping forces creep upward. Remember the stop screw only shortens the extend stroke within the ordered 20 mm window and is a mechanical end stop, not a mid-stroke lock, so a suspended load will still drift if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet lets you add CMSE / DMSE position 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 ACEJ20X50-20S 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 code is a 20 mm adjustment window: an external stop screw shortens the 50 mm extend stroke by up to 20 mm, so the working range is 30-50 mm. It shortens only - it never extends past the ordered stroke, and it is an end stop, not a load-holding brake. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots. FA flange, LB foot and FTC brackets plus I and Y rod knuckles bolt to the standard ISO 21287 face; the rod end is female M6x1.0 and the air port is M5x0.8.
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