Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30 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 ACEJ20X40-30
A double acting compact cylinder built to ISO 21287, the ACEJ20X40-30 pairs a 20 mm bore with a 40 mm stroke that an external stop screw can trim anywhere from 10 to 40 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, enough for small clamping and positioning heads in tight jigs. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into guard rails and gantry fixtures a full-length body cannot reach.
The hard-anodized aluminium body carries a hard-chromed S45C rod with a female M6x1.0 thread, and fixed TPU bumpers at both ends absorb end-of-stroke shock. For sizing, plan on roughly 94 N (about 9.6 kgf) of usable work at 0.5 MPa, or expect it to lift about 8 kg vertically with a 2:1 margin. FA flange and LB foot brackets bolt to the standard ISO 21287 face, and ordering the optional -S magnet enables CMSE / DMSE switches; without -S no magnet is fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30 |
|---|---|
| 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 ACEJ20X40-30
| 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 ACEJ20X40-30 Is Used
Small-parts press fitting
Trims the 40 mm stroke down to seat bearings or bushings in electronics assemblies, using the 157.1 N push force at 0.5 MPa for repeatable light pressing.
Fixture clamp in tight jigs
The short ISO 21287 body fits inside welding and machining jigs where an ISO 15552 profile cylinder would overhang, with FA flange mounting on the standard face.
Indexed gate on a pick station
With the optional -S magnet, CMSE or DMSE switches confirm end positions on a sorting gate running at 30-500 mm/s.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30 the Right Cylinder?
At 157.1 N push (117.8 N pull) at 0.5 MPa, this 20 mm bore suits light clamps, gates and ejectors. Step down to the 16 mm bore (100.5 N push) for smaller loads, or up to the 25 mm bore (245.4 N push) if you need more margin. Note the stop screw only shortens the extend stroke and does not hold a load if air is lost. Choose the female rod thread here, or the B option for a male M6x1.0 stud, and add the -S code if CMSE / DMSE position sensing is 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 ACEJ20X40-30 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; 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, giving a usable range of 10-40 mm. It is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, hard-chromed S45C rod, M5x0.8 ports and fixed TPU bumpers at both ends. FA flange and LB foot brackets bolt straight on. Position sensing requires the optional -S magnet ordered with the cylinder; only then can CMSE / DMSE switches be mounted.
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