Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20SB 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 ACEJ12X40-20SB
A double acting compact actuator built to ISO 21287, the ACEJ12X40-20SB pairs a 12 mm bore with a 40 mm stroke that an external stop screw can trim anywhere in a 20 mm window, giving a usable extend range of 20-40 mm. 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 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarding where a full-length body simply will not fit.
Plan on roughly 34 N of real work at 0.5 MPa (about 60% of the rated push), which is around 3 kg of vertical lift with a sensible margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod with a male thread (the B code), and fixed TPU bumpers absorb end-of-stroke shock at both ends. Because this model carries the optional -S magnet, CMSE or DMSE reed and solid-state switches can be clamped straight onto the body slots for end-of-travel signalling.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20SB |
|---|---|
| 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 ACEJ12X40-20SB
| 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 ACEJ12X40-20SB Is Used
Small-part ejection from plastic moulds
The 56.5 N push at 0.5 MPa is enough to kick light moulded clips or caps off the ejector side, and the 20-40 mm adjustable range lets the setter dial the ejection travel to the cavity depth.
Lab sample vial indexing
A 6 mm hard-chrome rod with male thread drives a lightweight vial pusher between two positions 20-40 mm apart, while the fitted magnet and a CMSE switch confirm each vial has arrived.
Bench-top clamp for electronics assembly
Holding PCB carriers or small jigs needs only a few tens of newtons; the compact body saves about 50% of the length of an ISO 15552 profile cylinder, keeping the fixture footprint tight.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20SB the Right Cylinder?
Check the load first: if your part or tooling weighs under about 3 kg vertically, this 12 mm bore has headroom; heavier picks should step up to the 16 mm bore (100.5 N push at 0.5 MPa) or the 20 mm bore (157.1 N). Smaller duty than 56.5 N at 0.5 MPa is rare, so this is effectively the entry point of the range. Remember the stop screw only shortens the extend stroke within the ordered 20 mm window and drifts on air loss, so it is not a load lock. FA flange or LB foot mounting bolts to the ISO 21287 face, PT ports take M5x0.8 fittings, and the fitted magnet lets you add CMSE / DMSE switches without reordering.
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 ACEJ12X40-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa the figures are 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting, 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, with the extend stroke adjustable between 20 and 40 mm via the stop screw.
An external stop screw shortens the 40 mm extend stroke by up to 20 mm, so you can set any extend travel from 20 to 40 mm on site; it acts only as an end stop, so the rod still drifts if air is lost. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches mount directly in the body slots. The male-threaded rod, M5x0.8 PT ports and FA/LB mounting make it a drop-in for compact ISO 21287 fixtures.
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