Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 45mm 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.
- BoreØ20 mm
- Stroke45 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40
The ACEJ20X45-40 is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 45 mm stroke that an external stop screw trims anywhere in a 40 mm window, giving a usable extend range of 5-45 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa, with a theoretical peak of 32 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 tight fixtures where a full-length body will not fit.
In practice, plan on roughly 94 N of real work at 0.5 MPa (about 60% of the push rating), which means this unit lifts about 4 kg vertically with a 2:1 margin - enough for small clamps, chutes and light parts. The hard-anodized aluminium body carries a roller-burnished bore, the S45C rod is hard-chrome plated, and fixed TPU bumpers absorb end-of-stroke shock. Air supply is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the rod end is female M6x1.0 with a PT port thread.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 45 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| 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 100 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | 165 N |
| Max (@1.0 MPa) | 32 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 ACEJ20X45-40
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | 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 ACEJ20X45-40 Is Used
Small-part press fitting
Pressing dowel pins or bushings into aluminium housings on an assembly bench, where the 157.1 N push at 0.5 MPa and the 5-45 mm trim range let one cylinder serve several part heights.
Packaging line part stop
Stopping or diverting cartons on a conveyor lane, using the compact short body that saves about 50% of the mounting length of an ISO 15552 profile cylinder beside the guard rail.
Lab sample indexing
Advancing sample trays in a compact analytical or filling station, where the M5x0.8 port, 30-500 mm/s speed band and 4 kg vertical-lift margin suit light, repeatable moves.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40 the Right Cylinder?
At this bore size the 20 mm ACEJ sits mid-range: a 16 mm bore gives 100.5 N push at 0.5 MPa, while a 25 mm bore reaches 245.4 N, so step up if your clamp needs more than about 94 N of working force. Note that the stop screw only shortens the extend stroke and is a mechanical end stop, not a mid-stroke lock - on air loss the piston still drifts, so add a separate holding valve if the load must stay put. FA flange or LB foot mounts bolt to the ISO 21287 face, and if you need position sensing, order the -S variant, since this code has no magnet and accepts no CMSE / DMSE switch.
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 ACEJ20X45-40 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The ordered stroke is 45 mm and the -40 code allows the extend stroke to be trimmed by up to 40 mm with the external stop screw, so the usable range is 5-45 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed 30-500 mm/s.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, S45C hard-chrome plated rod, threaded covers and fixed TPU bumpers at both ends that absorb end-of-stroke energy. Mounting is via FA flange or LB foot on the ISO 21287 face. Position sensing requires the optional -S magnet code, which enables CMSE / DMSE switches; this model without -S carries no magnet, so no switch can be mounted.
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