Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40 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 ACEJ20X80-40
This double acting compact cylinder is built to the ISO 21287 short-body format, so it takes up roughly half the mounting length of an ISO 15552 profile cylinder - ideal when a small jig or fixture has no room for a full-length body. On a 20 mm bore it delivers 157.1 N pushing and 117.8 N pulling at 0.5 MPa (219.9 N / 164.9 N at 0.7 MPa), with the -40 code giving a 40 mm adjustment window: an external stop screw trims the 80 mm extend stroke down to as little as 40 mm on site, no disassembly needed.
The hard-anodized aluminium body carries a hard-chrome plated S45C rod with a female M6x1.0 thread, and fixed TPU bumpers at both ends absorb end-of-stroke shock. In practice, plan on about 94 N (roughly 9.6 kg) of usable push at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. The magnet is not fitted on this version; order the -S code if you later need CMSE / DMSE switch positioning.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40 |
|---|---|
| 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 ACEJ20X80-40
| 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 ACEJ20X80-40 Is Used
Small-part ejection from plastic molds
The 40-80 mm trim range lets you tune the ejector throw per mold, while the 157.1 N push at 0.5 MPa clears lightweight PP or ABS parts reliably.
Bench-top test station actuation
A lab press fixture for connector crimp checks uses the adjustable stop to set contact depth in 40-80 mm, with about 9.6 kg of usable push force at 0.5 MPa.
Carton flap tucking on a packing line
The short ISO 21287 body slots between conveyor guards where a profile cylinder will not fit, and the stop screw adapts the stroke to different carton heights.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-40 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 tooling mass grows, or down to 16 mm to save space. Remember the stop screw is a mechanical end stop, not a mid-stroke lock - the rod will drift if air is lost, so add a separate clamp for load holding. FA flange and LB foot mountings bolt to the standard ISO 21287 face, and the optional -S magnet enables 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 ACEJ20X80-40 FAQ
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 maximum of 32 kgf at 1.0 MPa. It runs on 0.15-1.0 MPa (22-145 psi) filtered air at 30-500 mm/s, from -20 to +70 C, with a 1.5 MPa (215 psi) proof pressure and an M5x0.8 port. The extend stroke is trimmed from 80 mm down to 40 mm via the external stop screw.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits tight fixtures and guards. Fixed TPU bumpers at both ends absorb end-of-stroke impact. FA flange and LB foot mountings plus I/Y rod knuckles bolt to the standard face. This version has no magnet; ordering the optional -S code adds one so CMSE / DMRE-free CMSE / DMSE switches can sense position.
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