Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke40 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 ACEJ20X40-40B
The ACEJ20X40-40B is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 40 mm stroke that an external stop screw can trim anywhere in a 40 mm window, giving a usable extend range of 0-40 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N and 164.9 N, with a theoretical peak of 32 kgf at 1.0 MPa. The male rod thread (B code) bolts directly to tooling, and the M5x0.8 ports suit small manifolds.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into cramped slide assemblies and fixture plates. Rule of thumb: plan on roughly 94 N (about 0.6 of the push force) for real work, which lifts about 8 kg vertically, or about 4 kg with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke impact, the hard-anodized aluminium body carries the optional -S magnet for CMSE / DMSE switches (no magnet is fitted without it), and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 40 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 ACEJ20X40-40B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | 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 ACEJ20X40-40B Is Used
Small-parts ejection from an injection mold
The 0-40 mm adjustable extend stroke trims exactly how far the pusher reaches into a mold pocket, with 157.1 N at 0.5 MPa enough to clear a 30 g plastic cap.
Vial diverter on a pharma packaging line
Short 40 mm body fits between conveyor guard rails where a full-length profile cylinder will not; the male rod thread drives a lightweight gate directly.
End-of-arm bracket on a benchtop robot
With the optional -S magnet, CMSE / DMSE switches confirm gate or gripper position inside the tight envelope of a compact pick-and-place cell.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40B the Right Cylinder?
At 20 mm bore this sits in the light class: step down to the 16 mm bore (100.5 N push at 0.5 MPa) for lighter pick-and-place, or up to the 25 mm bore (245.4 N) when loads creep past 100 N. Note the stop screw is an extend-side end stop only, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange or LB foot mountings and I/Y rod knuckles fit the ISO 21287 face; order the -S code if you need CMSE / DMSE position sensing.
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 ACEJ20X40-40B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; theoretical maximum is 32 kgf at 1.0 MPa. The -40 code is a 40 mm adjustment window: an external stop screw shortens the 40 mm extend stroke on site, so the usable range is 0-40 mm. It cannot lengthen the stroke past 40 mm, and the stop is an end stop, not a load-holding lock.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at both ends and FA/LB mounting plus I/Y knuckles on the standard face. Position sensing requires the optional -S magnet code; without it there is no magnet and no CMSE / DMSE switch can be read. Operating range is 0.15-1.0 MPa (22-145 psi), -20 to +70 C, 30-500 mm/s.
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