Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20S 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 ACEJ12X40-20S
The ACEJ12X40-20S 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 (79.2 N / 59.4 N at 0.7 MPa), with a theoretical maximum of 11.5 kgf at 1.0 MPa. The external stop screw trims the 40 mm stroke by up to 20 mm on site, giving a usable extend range of 20-40 mm without changing the cylinder.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures, small gates and compact pick stations. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clipped onto the body for end-of-stroke signalling. In practice, plan on roughly 34 N of usable push at 0.5 MPa, which lifts about 3 kg vertically - halve that for a 2:1 margin and match parts under 1.5 kg. The hard-anodized aluminium body and S45C hard-chrome plated 6 mm rod keep wear low, and a fixed TPU bumper at each end absorbs end-of-stroke shock.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20S |
|---|---|
| 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 ACEJ12X40-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 ACEJ12X40-20S Is Used
Small-part ejection from fixtures
Trims its extend stroke between 20 and 40 mm to eject machined pins or bushings from a drilling jig, with the 56.5 N push at 0.5 MPa enough for parts under about 3 kg.
Position feedback on compact gates
The fitted -S magnet lets CMSE or DMSE switches confirm gate-open and gate-closed on a small guarding door, where the short body fits inside the guard frame.
Light clamping in electronics assembly
Holds PCB carriers or connector housings during screwdriving, using roughly 34 N of practical force at 0.5 MPa and the stop screw to set exact clamp travel.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20S the Right Cylinder?
At 56.5 N push at 0.5 MPa this 12 mm bore suits light clamping, ejecting and sorting of small parts. Step down is not available below 12 mm in this series; step up to the 16 mm bore (100.5 N push) if your load needs more margin. The stop screw only shortens the extend stroke and acts as an end stop - it does not lock the piston mid-stroke, so on air loss the rod can drift. The fitted -S magnet pairs with CMSE / DMSE switches, and FA flange or LB foot mounts bolt to the standard ISO 21287 face. Port is M5x0.8 and the rod end carries a female M3x0.5 thread.
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 ACEJ12X40-20S FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push rises to 79.2 N and pull to 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, with an M5x0.8 port and a 6 mm rod with female M3x0.5 thread. The -20 stop screw gives a 20-40 mm extend range.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits tight jigs and guards. FA flange and LB foot mounts bolt to the standard face, and I or Y rod knuckles attach to the female M3x0.5 rod thread. A fixed TPU bumper at each end absorbs end-of-stroke shock. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted on the body slots for stroke-end detection.
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