Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10 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 ACEJ20X40-10
A double acting ISO 21287 compact cylinder, the ACEJ20X40-10 pairs a 20 mm bore with a 40 mm stroke and an external stop screw that trims the extend stroke anywhere in a 10 mm window, so the usable range is 30-40 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 32 kgf at 1.0 MPa. The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight jigs and guarding where a full-length body cannot.
For sizing the work, plan on roughly 94 N of usable push at 0.5 MPa, and expect it to lift about 8 kg vertically once you keep a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, a fixed TPU bumper sits at both ends, and the optional -S magnet lets CMSE / DMSE switches report position; without the -S code there is no magnet fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10 |
|---|---|
| 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 ACEJ20X40-10
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -10 | 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 ACEJ20X40-10 Is Used
Small-part press fitting
Pressing dowel pins or bearings into aluminium housings on an electronics assembly bench, where the 30-40 mm trimmed stroke matches shallow insert depths and the 94 N working push is enough for light interference fits.
Fixture clamping on CNC pallets
Clamping machined brackets against a CNC fixture stop; the short body fits under the pallet guard where an ISO 15552 profile cylinder would be about twice as long.
Reject gate on a packaging line
Kicking off-spec blister packs at a sorting station, with the optional -S magnet driving CMSE or DMSE switches to confirm the gate reached its trimmed end position.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10 the Right Cylinder?
At 157.1 N push at 0.5 MPa this 20 mm bore sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N); step up to 25 mm if your fixture grows, or down to 16 mm for lighter clamping. The stop screw only shortens the extend stroke and is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange, LB foot and FTC brackets plus I/Y rod knuckles bolt to the ISO 21287 face, and the female M6x1.0 rod thread takes standard tooling plates directly.
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 ACEJ20X40-10 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 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), speed 30-500 mm/s, temperature -20 to +70 C, with a 10 mm adjustment window on the 40 mm stroke and an M5x0.8 port.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange, LB foot and FTC brackets plus I/Y rod knuckles bolt straight to its face. Position sensing needs the optional -S magnet code; with -S ordered, CMSE and DMSE switches mount in the body slots, while the standard build has no magnet. A fixed TPU bumper at each end absorbs end-of-stroke energy.
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