Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50S 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 ACEJ20X50-50S
The ACEJ20X50-50S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that can be trimmed on site by up to 50 mm using an external stop screw, giving a usable extend range of 0-50 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. As a rule of thumb, plan for about 94 N of real work at 0.5 MPa, which is roughly 9 kg of vertical lift with a 2:1 margin - enough for small fixtures, gates and sensor-actuated parts.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit. A fixed TPU bumper at each end absorbs end-of-stroke energy, the hard-anodized aluminium body carries the optional -S magnet (fitted on this model) for CMSE / DMSE switches, and the S45C hard-chrome rod ends in a female M6x1.0 thread. Air supply is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, temperature -20 to +70 C.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50S |
|---|---|
| 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 ACEJ20X50-50S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-50S Is Used
Small jig clamping
The 0-50 mm adjustable window lets one cylinder serve several fixture variants on an electronics assembly jig, with about 94 N of usable clamping force at 0.5 MPa.
Position-verified ejector
With the fitted -S magnet, CMSE or DMSE switches confirm extend and retract on a PCB tray ejector running at 30-500 mm/s.
Compact gate pusher
The short body, about 50% shorter than an ISO 15552 profile cylinder, fits inside guarding to push a small conveyor gate through its 50 mm stroke.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50S the Right Cylinder?
Size up if 157.1 N at 0.5 MPa is marginal: the 25 mm bore delivers 245.4 N push and 206.2 N pull at the same pressure. Size down to the 16 mm bore (100.5 N push / 75.4 N pull) for lighter pick-and-place work. Note that the stop screw is a mechanical end stop for the extend stroke only - on air loss the piston still drifts, so add a separate valve or lock if you need position holding. FA flange or LB foot mounts bolt to the ISO 21287 face, and this -S model already carries the magnet for CMSE / DMSE switch mounting.
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 ACEJ20X50-50S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; theoretical maximum 32 kgf at 1.0 MPa. The -50 code is a 50 mm adjustment window: an external stop screw shortens the 50 mm extend stroke by up to 50 mm, so the usable range is 0-50 mm. It shortens the stroke only - it never extends it past 50 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
The ISO 21287 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. Because this model carries the optional -S magnet, CMSE / DMSE reed or solid-state switches can be mounted directly in the body slots. Rod end is a female M6x1.0 thread, air port is M5x0.8, and FA flange or LB foot mounts bolt straight on.
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