Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30S 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 ACEJ20X40-30S
The ACEJ20X40-30S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 40 mm stroke that an external stop screw can trim by up to 30 mm, giving a usable extend range of 10-40 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa. A practical rule of thumb: plan on roughly 94 N of real work at 0.5 MPa, and expect it to lift about 8 kg vertically with a 2:1 margin (16 kg theoretical).
The hard-anodized aluminium body is about 50% shorter in mounting length than an ISO 15552 profile cylinder, so it slots into tight jigs and gantries. The -S code on this model means the magnet is fitted, so CMSE / DMSE reed or solid-state switches can be clamped straight into the body slots. Air supply is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and a fixed TPU bumper sits at both ends.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30S |
|---|---|
| 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 ACEJ20X40-30S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -30 | 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 ACEJ20X40-30S Is Used
Small-parts ejection in assembly jigs
A 157.1 N push at 0.5 MPa is enough to kick stamped terminals or molded inserts off a nest, and the 10-40 mm adjustable range lets one cylinder serve nests of different depths.
Position-verified test stations
With the -S magnet fitted, CMSE or DMSE switches confirm extend and retract on a PCB or connector test fixture running at 30-500 mm/s.
Light press-fit of bushings
About 94 N of practical working force at 0.5 MPa presses small bushings or dowels into plastic housings, with the stop screw trimming stroke per part variant.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30S the Right Cylinder?
At 157.1 N push at 0.5 MPa this 20 mm bore suits light clamping and positioning; drop to a 16 mm bore (100.5 N) for smaller loads or step up to a 25 mm bore (245.4 N) if you need more force in the same compact family. The 30 mm window lets one cylinder serve several station depths - set the stop screw once and the extend stroke lands anywhere from 10 to 40 mm. Remember the stop is a mechanical end stop only: on air loss the rod still drifts, so it is not a load-holding lock. Choose FA flange or LB foot mounting, and order CMSE or DMSE switches to read position - the magnet is already fitted on this -S model.
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 ACEJ20X40-30S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The -30 code is a 30 mm adjustment window: an external stop screw shortens the 40 mm extend stroke by up to 30 mm, so the working range is 10-40 mm. It is double acting, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, and moves at 30-500 mm/s.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow fixtures and guarded cells. The hard-anodized aluminium body carries a 10 mm hard-chrome-plated S45C rod with a female M6x1.0 thread, a fixed TPU bumper at each end, and slots for CMSE / DMSE switches because the optional -S magnet is fitted on this model. FA flange and LB foot mounts bolt straight to the standard face.
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