Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20SB 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 ACEJ20X40-20SB
The ACEJ20X40-20SB is a double acting 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 20 mm window, giving a usable extend range of 20-40 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The male-threaded rod (B code) bolts directly to tooling, and the -S magnet this model carries lets CMSE / DMSE switches report end positions.
The hard-anodized aluminium body with an S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into shallow fixtures and guarded cells. Plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), 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 shock, and speed runs 30-500 mm/s on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20SB |
|---|---|
| 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 ACEJ20X40-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | 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 ACEJ20X40-20SB Is Used
Small-part ejector on assembly fixtures
The 20-40 mm trimmed extend range clears a shallow die pocket exactly, and 157.1 N at 0.5 MPa is enough to push pressed bushings or terminals off a nest.
Light clamping of machined housings
About 94 N of usable clamping force holds aluminium brackets against a stop during a drilling or deburring cycle, with the male rod thread taking a custom clamp pad.
Position-verified indexing slide
The fitted -S magnet drives CMSE or DMSE switches at both ends, confirming the slide reached full extend and retract before the PLC releases the next part.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20SB the Right Cylinder?
Size this bore when your jig needs 157.1 N of push at 0.5 MPa. A 16 mm bore delivers only 100.5 N at the same pressure, while a 25 mm bore reaches 245.4 N - so the 20 mm sits in the middle for light clamping and indexing. Remember the stop screw is an 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 and I/Y rod knuckles fit the ISO 21287 face, and the fitted -S magnet works with CMSE / DMSE 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 ACEJ20X40-20SB FAQ
This 20 mm bore, 40 mm stroke model pushes 157.1 N and pulls 117.8 N at 0.5 MPa, pushes 219.9 N and pulls 164.9 N at 0.7 MPa, and reaches a theoretical 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke: the stop screw trims the 40 mm stroke by up to 20 mm for a 20-40 mm range. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, port M5x0.8, rod 10 mm with male thread, and the max standard stroke for this bore is 100 mm.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits where a full-length cylinder cannot. FA flange and LB foot mounts plus I/Y rod knuckles bolt to the standard face. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots; ACEJ models ordered without -S have no magnet. A fixed TPU bumper at each end absorbs end-of-stroke impact.
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