Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40SB 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 ACEJ20X80-40SB
A double acting compact cylinder built to ISO 21287, the ACEJ20X80-40SB pairs a 20 mm bore with an 80 mm stroke that an external stop screw can trim anywhere in a 40 mm window, giving a usable extend range of 40-80 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend side at 0.7 MPa. The hard-anodized aluminium body with an S45C hard-chrome rod takes up roughly half the mounting length of an ISO 15552 profile cylinder, so it slots into shallow fixtures and guarded cells.
Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches clamp straight onto the body slots for end-of-stroke signalling. The male rod thread (B code) suits couplers and tooling plates, and the fixed TPU bumper at each end softens arrival at 30-500 mm/s. For sizing, treat about 94 N (roughly 0.6 of the push force) as the practical working load at 0.5 MPa, and expect it to lift about 8 kg vertically once a 2:1 margin is applied.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40SB |
|---|---|
| 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 ACEJ20X80-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 ACEJ20X80-40SB Is Used
Carton push-off on a case packer
The 40-80 mm trim range lets one cylinder eject cartons of differing widths on a packaging line, with 157.1 N at 0.5 MPa enough for light corrugated loads.
Position-flagged part present check
With the -S magnet fitted, CMSE / DMSE switches confirm the rod has reached the trimmed stop before a PLC releases the next part in an assembly station.
Small fixture clamping on a drill jig
The short ISO 21287 body fits under a jig lid where a full-length profile cylinder will not, holding jigs with about 94 N of usable clamping force.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40SB 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 down for light pick-and-place, step up when the payload climbs past about 94 N of real work. The 40 mm window means one cylinder can serve several product lengths, but remember the stop screw only shortens the extend stroke and drifts on air loss, so it is not a mid-stroke lock. FA flange or LB foot mountings bolt to the ISO 21287 face, and the -S magnet already on board accepts 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 ACEJ20X80-40SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; 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. 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, and the port is M5x0.8. The extend stroke is adjustable from 40 to 80 mm via the external stop screw within the -40 window.
An external stop screw on the front end shortens the 80 mm extend stroke by up to 40 mm, so the working range is 40-80 mm; it is a mechanical end stop, not a load-holding brake, so the rod can drift if air is lost. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches mount directly in the body slots. The fixed TPU bumper at both ends absorbs end-of-stroke energy, and FA flange or LB foot mountings bolt to the standard ISO 21287 face.
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