Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB 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 ACEJ12X50-40SB
The ACEJ12X50-40SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, and the short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body cannot.
The -40 code is a 40 mm adjustment window: an external stop screw trims the 50 mm extend stroke on site, giving a usable range of 10-50 mm without swapping the cylinder. Plan on roughly 34 N (about 3 kg) of usable work at 0.5 MPa rather than the full rating, which corresponds to lifting roughly 1.5 kg vertically with a 2:1 margin. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted for end-of-stroke signalling, and fixed TPU bumpers at both ends absorb end-of-stroke shock.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB |
|---|---|
| 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 ACEJ12X50-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -40 | 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 ACEJ12X50-40SB Is Used
Small-part presence check
A 12 mm bore probing tiny electronic components on an assembly fixture gets 56.5 N at 0.5 MPa, and the fitted magnet drives a CMSE switch to confirm the trimmed stroke was reached.
Multi-length ejection station
One ejector serving 10-50 mm product variants: the stop screw is re-set per changeover instead of re-piping, with the 40 mm window covering the whole family.
Compact jig clamping
Inside a cramped drill jig head, the short body that saves about 50% of an ISO 15552 profile cylinder's mounting length delivers about 34 N of practical clamp force at 0.5 MPa.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB the Right Cylinder?
At this bore size the neighbours matter: a 16 mm bore pushes 100.5 N at 0.5 MPa if your load creeps up, while stepping down is not possible since 12 mm is the smallest ACEJ bore. The -40 window suits stations where one cylinder must serve several product lengths; remember the stop screw only shortens the extend stroke and drifts on air loss, so it is not a load-holding lock. With the -S magnet fitted, add CMSE or DMSE switches; FA flange or LB foot mounts bolt straight to the ISO 21287 face.
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 ACEJ12X50-40SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push is 79.2 N and pull 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke (40 mm window on a 50 mm stroke, so 10-50 mm usable), runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s, port M5x0.8, 6 mm rod with male thread, and fixed TPU bumpers both ends.
An external stop screw shortens the extend stroke by up to 40 mm within the ordered -40 window; it cannot lengthen the stroke past 50 mm, and it acts as an end stop only, so the piston still drifts if air is lost. Because this model carries the optional -S magnet, CMSE / DMSE reed or solid-state switches mount directly on the body slots for end-of-stroke detection.
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