Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 ACEJ20X50-40S
The ACEJ20X50-40S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw trims on site: the -40 code gives a 40 mm adjustment window, so the extend stroke can be set anywhere from 10 to 50 mm without changing the cylinder. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa, with a theoretical maximum of 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 suits tight jigs and guarded stations. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped straight into the body slots for end-of-stroke signalling. For sizing, treat roughly 94 N (about 9.6 kgf) as the usable working force at 0.5 MPa, and expect it to lift around 8 kg vertically once a 2:1 margin is applied. A fixed TPU bumper at each end absorbs end-of-stroke impact, and the hard-anodized aluminium body with an S45C hard-chrome plated rod stands up to continuous cycling.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 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 ACEJ20X50-40S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-40S Is Used
Fixture clamp with trimmed stroke
On a small CNC jig, the stop screw is set to 32 mm so the 157.1 N push seats a locating pin without bottoming out, and the fitted magnet signals clamp-complete to the PLC.
Position-verified ejector
A packaging mini-station uses the 10-50 mm adjustable range to eject cartons of differing widths, with a DMSE solid-state switch confirming each extend stroke.
Compact press-assist
An electronics assembly bench uses the 94 N usable working force at 0.5 MPa to press-fit connectors, where the short body fits inside the guarding that excludes a longer profile cylinder.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40S the Right Cylinder?
At 157.1 N push at 0.5 MPa this bore sits between the 16 mm size (100.5 N push) and the 25 mm size (245.4 N push); step up to 25 mm if your fixture needs the extra margin, or down to 16 mm to save space on lighter clamping. The stop screw shortens the extend stroke only within the 40 mm window - it is a mechanical end stop, not a mid-stroke lock, so the rod will still drift if air is lost and a separate holding method is needed for suspended loads. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet means CMSE / DMSE switches can be added at any time. Running speed is 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
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 ACEJ20X50-40S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The -40 code is a 40 mm adjustment window: an external stop screw shortens the 50 mm extend stroke to any value from 10 to 50 mm. It is a mechanical end stop only - it does not lock or hold a load if air pressure is lost.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, an S45C hard-chrome rod and a fixed TPU bumper at both ends. The -S magnet is fitted on this model, so CMSE / DMSE reed or solid-state switches mount in the body slots. FA flange and LB foot mounts attach to the standard ISO 21287 face; the air port is M5x0.8.
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