Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40B 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 ACEJ12X40-40B
A double acting AirTAC ACEJ12X40-40B with a 12 mm bore and 40 mm stroke, trimmed on site by an external stop screw across the full 40 mm window, so the extend stroke can be set anywhere from 0 to 40 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those rise to 79.2 N and 59.4 N, with a theoretical 11.5 kgf at 1.0 MPa. The male rod thread (B code) suits tooling that screws straight onto the rod.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarded cells. For sizing, treat roughly 34 N (about 3.4 kg of push) as the practical working force at 0.5 MPa, or plan on lifting about 2.9 kg vertically with a 2:1 margin. Air is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and fixed TPU bumpers absorb the ends. Note: no magnet is fitted unless you order the optional -S code, which then enables CMSE / DMSE switches.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40B |
|---|---|
| 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 ACEJ12X40-40B
| 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 ACEJ12X40-40B Is Used
Small-part ejection
Ejects finished bushings or pins off a lathe fixture; the 0-40 mm adjustable stroke lets one cylinder serve several part lengths.
Lab sample indexing
Advances sample trays in compact analytical equipment where the short ISO 21287 body fits inside a tight enclosure.
Light gate latching
Latches small machine guards and chutes; the male rod thread (B code) takes a threaded latch arm directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40B the Right Cylinder?
At this bore size the 56.5 N push at 0.5 MPa suits light clamping, ejecting small parts and low-load positioning; if your load needs more, step up to bore 16 (100.5 N push at 0.5 MPa) or bore 20 (157.1 N). Going smaller is not possible - 12 mm is the smallest ACEJ bore. The stop screw is a mechanical end stop only: on air loss the piston drifts, so do not rely on it to hold a load mid-stroke. Mount with FA flange or LB foot on the ISO 21287 face, and add the -S magnet code if you need CMSE / DMSE position switches.
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 ACEJ12X40-40B FAQ
Push 56.5 N and pull 42.4 N at 0.5 MPa; push 79.2 N and pull 59.4 N at 0.7 MPa; theoretical maximum 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um, port M5x0.8, rod 6 mm with male thread, and the extend stroke is adjustable 0-40 mm via the stop screw.
The ISO 21287 compact 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. Sensing is not included by default: order the optional -S magnet code to enable CMSE / DMSE switches; without -S there is no magnet and no switch can be read.
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