Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20S 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 ACEJ20X40-20S
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ20X40-20S pairs a 20 mm bore with a 40 mm stroke and a 20 mm stop-screw window, so the usable extend range is trimmed anywhere from 20 to 40 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa, with a theoretical ceiling of 32 kgf at 1.0 MPa. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight jigs and guarding where a full-length body will not fit.
The hard-anodized aluminium body carries a roller-burnished bore, the S45C rod is hard-chrome plated, and a fixed TPU bumper at each end absorbs end-of-stroke energy. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches mount directly in the body slots for end-of-travel signals. As a working rule, plan on roughly 94 N (about 9 kg vertical) of real work at 0.5 MPa rather than the full 157.1 N rating, which keeps a sensible margin on clamping and lifting jobs.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20S |
|---|---|
| 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 ACEJ20X40-20S
| 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 ACEJ20X40-20S Is Used
Small-part clamping on assembly fixtures
The 157.1 N push at 0.5 MPa holds connectors, brackets and stamped clips in drilling or press fixtures, and the 20-40 mm adjustable range lets one fixture serve several part heights.
Position-verified ejection on packaging lines
With the -S magnet fitted, CMSE or DMSE switches confirm the 40 mm eject stroke is complete before the conveyor advances, preventing jams on carton or blister lines.
Compact stopper modules in test rigs
The short body, about 50% shorter than an ISO 15552 profile cylinder, fits inside tight gauge and test stations where a 20-40 mm extend stroke and 117.8 N pull are enough.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-20S the Right Cylinder?
Size both ways before committing: the 16 mm bore gives 100.5 N push at 0.5 MPa if your load is lighter, while the 25 mm bore reaches 245.4 N if you need more clamping force at the same compact footprint. This model suits loads in the 90-95 N working band at 0.5 MPa. Remember the stop screw only shortens the extend stroke and is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange or LB foot mountings bolt to the ISO 21287 face, and the fitted -S magnet lets you add CMSE / DMSE switches 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 ACEJ20X40-20S 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 push and 164.9 N pull, 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 fluid is air filtered to 40 um. The stop screw trims the 40 mm extend stroke by up to 20 mm, giving a 20-40 mm working range.
An external stop screw on the head shortens the extend stroke within the ordered -20 window, so you set any extend length from 20 to 40 mm by turning the screw; it cannot lengthen the stroke past 40 mm. This model carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches mount in the body slots for end-of-travel detection. Mounting is via the ISO 21287 face with FA flange or LB foot options, and a fixed TPU bumper at each end absorbs end-of-stroke energy.
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