Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm 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.
- BoreØ12 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB
The ACEJ12X50-20SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: a 12 mm bore, a 50 mm stroke and a 20 mm adjustment window, so the stop screw trims the usable extend range to 30-50 mm on site. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those figures rise to 79.2 N and 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The male rod thread (B code) suits external rod accessories, and the fitted -S magnet accepts CMSE / DMSE switches for end-position sensing.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarded cells where a full-length cylinder cannot. A rule of thumb for real work: plan on roughly 34 N (about 0.6 of the push force) at 0.5 MPa, which corresponds to lifting about 2.9 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, TPU bumpers sit at both ends, and the M5x0.8 ports take air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), running 30-500 mm/s from -20 to +70 C.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| 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 50 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 (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 57 N | 42 N |
| 0.7 MPa | 79 N | 59 N |
| Max (@1.0 MPa) | 12 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 ACEJ12X50-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | 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 ACEJ12X50-20SB Is Used
PCB fixture clamping
A 34 N usable push at 0.5 MPa is enough to hold small circuit boards in a test fixture, and the 30-50 mm trimmed stroke fits shallow jig plates.
Small-part ejection with feedback
Ejects light components from a bowl-feeder track while the fitted magnet drives a CMSE switch to confirm each extend cycle.
Bottle-cap press check
In a packaging line, the adjustable window lets technicians dial the press stroke between 30 and 50 mm for different cap heights.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20SB the Right Cylinder?
At 56.5 N push (0.5 MPa) this 12 mm bore covers light clamping, ejecting and part-presenting duties; if your load needs more, step up to the 16 mm bore (100.5 N push) or the 20 mm bore (157.1 N push). Smaller needs do not exist below this bore in the range, so downsize the pressure instead. Choose the male rod thread (B) when bolting on knuckles or custom tooling, and keep the -S magnet with CMSE / DMSE switches for PLC feedback. Remember the stop screw only shortens the extend stroke within the 20 mm window - it is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost.
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 ACEJ12X50-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N; theoretical maximum is 11.5 kgf at 1.0 MPa. The -20 code gives a 20 mm adjustment window: an external stop screw shortens the 50 mm extend stroke, giving a usable range of 30-50 mm. It shortens only - it never extends past the ordered stroke, and it is an end stop, not a load-holding lock.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with fixed TPU bumpers absorbing end-of-stroke energy. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped into the body slots for position feedback. FA flange and LB foot mounts plus I/Y rod knuckles bolt to the standard face, and the male rod thread accepts external tooling. Port is M5x0.8; weight is not listed - confirm from datasheet.
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