Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 40mm 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
- Stroke40 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 ACEJ12X40-40S
A double acting compact actuator built to ISO 21287, the ACEJ12X40-40S pairs a 12 mm bore with a 40 mm stroke and an external stop screw that trims the extend stroke anywhere in the 0-40 mm window, so one cylinder serves several fixture positions. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N on the extend stroke at 0.7 MPa, with a theoretical ceiling of 11.5 kgf at 1.0 MPa.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into slim pick-and-place heads and guarded test stations. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped anywhere along the body for end-of-travel signals. As a rule of thumb, plan on roughly 34 N of usable work at 0.5 MPa (about 60% of the push rating), which corresponds to lifting around 1.7 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 40 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 ACEJ12X40-40S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 ACEJ12X40-40S Is Used
Lab sample indexing
The 56.5 N push at 0.5 MPa advances small sample trays into a test position, and the 0-40 mm stop screw lets technicians dial in exact advance distances per assay.
Sensored ejection check
With the fitted -S magnet, CMSE switches confirm the 6 mm rod has fully ejected a finished micro-part from a mould pocket before the conveyor indexes.
Small clamp on an assembly bench
About 1.7 kg of vertical lift equivalent makes this cylinder suitable for holding light PCB fixtures or connector blocks during a hand-solder or press-fit step.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40S the Right Cylinder?
At this bore size the neighbours matter: the ACEJ16X40-40S reaches 100.5 N push at 0.5 MPa if your load creeps above about 34 N, while stepping down to a 10 mm class actuator leaves little margin. Keep the stop screw set as an end stop only - on air loss the rod drifts, so do not rely on it to hold a load mid-stroke.
FA flange or LB foot mounts bolt to the standard ISO 21287 face, and the female M3x0.5 rod thread accepts standard rod knuckles. The fitted -S magnet means CMSE / DMSE switches work out of the box; order the plain code only if no sensing is needed.
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 ACEJ12X40-40S FAQ
At 0.5 MPa it delivers 56.5 N push and 42.4 N pull; at 0.7 MPa that rises to 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed range 30-500 mm/s on air filtered to 40 um. The extend stroke is adjustable from 0-40 mm via the external stop screw, and the bore 12 port is M5x0.8 with a female M3x0.5 rod thread.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits tight jigs and guarded cells. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches mount directly in the body slots for end-of-stroke detection. A fixed TPU bumper at each end absorbs end-of-stroke energy, and FA flange or LB foot mounts bolt to the standard face.
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