Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 80mm 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
- Stroke80 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 ACEJ20X80-20SB
The ACEJ20X80-20SB is a double acting AirTAC compact cylinder built to ISO 21287, with an adjustable extend stroke: an external stop screw trims the 80 mm stroke by up to 20 mm on site, giving a usable range of 60-80 mm. 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) suits inline tooling, and the -S magnet is fitted, so CMSE or DMSE switches can be mounted in the body slots for end-of-stroke signalling.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body will not fit. In practice, plan for roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which lifts about 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke energy, the hard-anodized aluminium body resists wear, and the S45C hard-chrome rod keeps friction low across the 30-500 mm/s speed range.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 80 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 ACEJ20X80-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 ACEJ20X80-20SB Is Used
Fixture clamping on CNC pallets
The 60-80 mm adjustable window lets a jig builder trim clamp travel to the part without changing cylinders, while 157.1 N push at 0.5 MPa holds light aluminium housings during drilling.
Small-part pusher on packaging lines
With about 8 kg vertical-lift equivalent and a short body that fits under low guard rails, this cylinder kicks cartons or blisters off a conveyor at up to 500 mm/s.
Position-checked ejector in test rigs
The fitted -S magnet works with CMSE / DMSE switches to confirm the trimmed extend position, so the rig interlocks before the probe cycle starts.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20SB 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). If your load needs more than about 94 N of usable force, step up to 25 mm; if under 60 N, the 16 mm bore saves space and air. Remember the stop screw is a mechanical end stop, not a mid-stroke lock - on air loss the piston can still drift, so use a separate valve or lock for load holding. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet lets CMSE / DMSE switches report the trimmed stroke position.
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 ACEJ20X80-20SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa that rises to 219.9 N push and 164.9 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 80 mm extend stroke by up to 20 mm, so the working range is 60-80 mm. It is double acting, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, and cycles at 30-500 mm/s.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and the port is M5x0.8 on this 20 mm bore. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches can be clipped into the body slots; models ordered without -S have no magnet. FA flange and LB foot mounts bolt straight to the ISO 21287 face, and a fixed TPU bumper at each end absorbs end-of-stroke energy - it does not hold or brake a load.
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