Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 90mm 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
- Stroke90 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 ACEJ20X90-20SB
The ACEJ20X90-20SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 90 mm stroke by up to 20 mm on site, giving a usable 70-90 mm range without changing the cylinder. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa. The male rod thread (B code) bolts straight into knuckle and fixture hardware, and the fitted -S magnet accepts CMSE / DMSE switches for end-position sensing.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so this 90 mm stroke unit slots into tight slides, guarding and gantries where a full-length body will not fit. For sizing, plan on roughly 94 N (about 9.6 kgf) of usable push at 0.5 MPa, which lifts around 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke energy, and the hard-anodized aluminium body with S45C hard-chrome rod runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 90 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 ACEJ20X90-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×90 | 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 ACEJ20X90-20SB Is Used
Small-part ejection on assembly fixtures
The 70-90 mm trimmed extend stroke and 157.1 N push at 0.5 MPa eject machined bushings or connector shells from a nest, with the male rod thread picking up a custom pusher.
Position-verified clamping on test rigs
With the fitted magnet driving CMSE / DMSE switches, the cylinder confirms the clamped position of PCB or sensor housings before a test cycle starts.
Light vertical lift in a compact gantry
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and the 8 kg vertical-lift margin handles small fixture plates inside a guarded pick station.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-20SB the Right Cylinder?
Step up or down by force: the 16 mm bore gives 100.5 N push at 0.5 MPa, while the 25 mm bore reaches 245.4 N - choose the 20 mm when 157.1 N push and a 90 mm stroke sit between them. Remember the stop screw only shortens the extend stroke; it is a mechanical end stop, not a mid-stroke lock, so the rod can drift if air is lost. The FA flange and LB foot mount on the ISO 21287 face, and this model already carries the -S magnet, so CMSE / DMSE switches can be added without reordering.
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 ACEJ20X90-20SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N (pull 164.9 N), with a theoretical maximum of 32 kgf at 1.0 MPa. A practical rule of thumb is about 94 N of usable push at 0.5 MPa, which lifts roughly 8 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
The -20 code sets a 20 mm window: an external stop screw shortens the 90 mm extend stroke anywhere down to 70 mm, set on site with a wrench. The stop is a mechanical end stop only - it does not hold a load if air is lost. This unit carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots for end-position signals, and the fixed TPU bumpers at both ends absorb end-of-stroke shock.
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