Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40S 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 ACEJ20X40-40S
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ20X40-40S pairs a 20 mm bore with a 40 mm stroke and a 40 mm trim window. An external stop screw shortens the extend stroke on site anywhere from 0 to 40 mm, so one cylinder covers several fixture positions. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight jigs, guards and gantry frames.
For sizing, treat roughly 94 N (about 0.6 of the push figure) as the practical working force at 0.5 MPa, and expect around 8 kg of vertical lift capability with a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, fixed TPU bumpers at both ends, and this -S model includes the magnet, so CMSE / DMSE reed or solid-state switches can be clipped on for end-of-stroke sensing. Speed range is 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40S |
|---|---|
| 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 ACEJ20X40-40S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACEJ20X40-40S Is Used
Small-part ejector on assembly jigs
The 0-40 mm trim window lets one cylinder serve multiple part heights, with 157.1 N push at 0.5 MPa enough to eject clips or bushings from light-duty nests.
Position-verified test stations
With the -S magnet fitted, CMSE or DMSE switches confirm extend and retract on a 40 mm stroke, ideal for leak-test or go/no-go fixtures in electronics assembly.
Compact lid-clamp module
The short ISO 21287 body fits inside machine guards where a full-length profile cylinder will not, holding small inspection covers closed with about 94 N of practical working force.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40S the Right Cylinder?
At 157.1 N push (0.5 MPa), bore 20 suits light clamping and positioning; step down to bore 16 (100.5 N) for smaller loads or up to bore 25 (245.4 N) when more force is needed. Remember the stop screw only trims the extend stroke and is not a mid-stroke lock, so the rod will drift if air is lost under load. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet lets CMSE / DMSE switches report 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 ACEJ20X40-40S 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. The -40 code is a 40 mm adjustment window: an external stop screw shortens the 40 mm extend stroke on site anywhere between 0 and 40 mm. It is a mechanical end stop only, not a mid-stroke lock, so the piston still drifts if air pressure is lost.
The ISO 21287 compact body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with fixed TPU bumpers at both ends and FA flange or LB foot mounting options. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots for end-of-stroke detection. Operating range is 0.15-1.0 MPa (22-145 psi), 30-500 mm/s, -20 to +70 C, on air filtered to 40 um.
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