Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 35mm 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.
- BoreØ12 mm
- Stroke35 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B
The ACEJ12X35-20B is a double acting ISO 21287 compact cylinder with a 12 mm bore and a 35 mm stroke that an external stop screw trims on site. The -20 code gives a 20 mm adjustment window, so the extend stroke can be set anywhere from 15 mm to the full 35 mm without changing hardware. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. In practice, plan for roughly 34 N of real work at 0.5 MPa, which is about 3 kg of vertical lift with a 2:1 margin.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so this 12 mm unit slots into slim fixtures, small gates and compact test rigs. A hard-anodized aluminium body carries an S45C hard-chrome-plated 6 mm rod with a male M3x0.5 thread (the B code), and a fixed TPU bumper at each end absorbs end-of-stroke shock. Note that no magnet is fitted on this version; order the -S code if you later need CMSE or DMSE switch position sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 35 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| 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 50 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 (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 57 N | 42 N |
| 0.7 MPa | 79 N | 59 N |
| Max (@1.0 MPa) | 12 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 ACEJ12X35-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×35 | 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 ACEJ12X35-20B Is Used
Compact test station actuator
The 56.5 N push at 0.5 MPa is enough to press small sensor probes or dip-test caps in a benchtop fixture, and the 15-35 mm trim range dials in exact probe travel.
Small-part ejection on assembly benches
A short 35 mm stroke ejects connectors or pins from a nest, and the compact body fits where a full-length ISO 15552 profile cylinder would overhang the bench.
Slide or gate positioning in tight cells
Male M3x0.5 rod thread couples straight to a sliding gate; the stop screw lets technicians shorten travel to 15 mm when the cell layout changes.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X35-20B the Right Cylinder?
At this bore size the 12 mm unit delivers 56.5 N push at 0.5 MPa. If your load needs more, step up to the 16 mm bore for 100.5 N push at the same pressure, or drop to a lighter duty if 56.5 N is already generous. The 35 mm stroke sits inside the 50 mm maximum standard stroke for bore 12, so it ships as a standard build. The male rod thread suits couplings and tooling that bolt directly to the rod, and FA flange or LB foot mounts attach to the standard ISO 21287 face. Remember the stop screw only shortens the extend stroke and drifts on air loss, so it is not a load-holding device.
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 ACEJ12X35-20B FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those rise to 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 12 mm bore, 35 mm stroke and a 20 mm adjustment window (usable 15-35 mm), running on air filtered to 40 um at 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, with a fixed TPU bumper at both ends and an M5x0.8 port.
An external stop screw shortens the extend stroke by up to 20 mm within the ordered -20 window, giving any setting from 15 mm to 35 mm; it is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. This version has no magnet, so CMSE or DMSE switches cannot be used; order the -S variant to enable them. Mounting is via FA flange or LB foot on the ISO 21287 face, and the short body saves about 50% of the length of an ISO 15552 profile cylinder.
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