Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 ACEJ20X40-20
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ20X40-20 pairs a 20 mm bore with a 40 mm stroke and a 20 mm adjustment window. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N. Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit.
For sizing work, treat roughly 94 N (about 0.6 of the push force) as the usable output at 0.5 MPa, which corresponds to lifting about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a 10 mm S45C hard-chrome rod with an M6x1.0 female thread, and air supply is M5x0.8. The fixed TPU bumper at each end absorbs end-of-stroke impact, and the optional -S magnet enables CMSE / DMSE switch sensing when ordered.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 40 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 ACEJ20X40-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACEJ20X40-20 Is Used
Small jig clamping
Trims the 40 mm stroke down to 20-40 mm to clamp brackets or housings on an assembly fixture, with 157.1 N push at 0.5 MPa suiting light clamping plates.
Bench press and staking
The short ISO 21287 body fits under a bench-top press frame, and about 94 N of usable force at 0.5 MPa handles staking pins and light forming on small parts.
Compact ejector on pick stations
Ejects finished components from a nest on a rotary indexing table; add the optional -S magnet to run CMSE / DMSE switches for part-present confirmation.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20 the Right Cylinder?
Pick this model when a 40 mm extend stroke must be trimmed on site: the external stop screw shortens it by up to 20 mm, giving a usable range of 20-40 mm. If your load needs more than about 157 N at 0.5 MPa, step up to the 25 mm bore (245.4 N push); for lighter duty the 16 mm bore delivers 100.5 N. Note the adjuster is a mechanical end stop only - on air loss the piston still drifts, so it is not a mid-stroke lock. FA flange, LB foot and FTC brackets bolt to the ISO 21287 face, and I / Y rod knuckles suit pivoting tooling. Order the -S code if CMSE / DMSE switches are planned.
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 ACEJ20X40-20 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; theoretical maximum is 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, fluid air filtered to 40 um. The extend stroke is adjustable from 20 to 40 mm via the stop screw within the -20 window.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits narrow gantries and guards. FA flange, LB foot and FTC brackets attach to the standard face, with I / Y rod knuckles for pivoting links. A fixed TPU bumper at both ends absorbs end-of-stroke impact. Position sensing needs the optional -S magnet, which allows CMSE / DMSE switches; without -S no magnet is fitted.
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