Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 20mm 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
- Stroke20 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 ACEJ12X20-20S
The ACEJ12X20-20S is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. An external stop screw trims the 20 mm stroke anywhere within the ordered -20 window, so one cylinder covers a 0-20 mm range without re-plumbing. The -S code means the magnet is fitted, so CMSE or DMSE reed and solid-state switches can be clamped into the body slots for end-of-stroke signalling.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits slim pick-and-place heads and guarded test stations. A hard-anodized aluminium body carries an S45C hard-chrome-plated 6 mm rod with an M3x0.5 female thread, and a fixed TPU bumper at each end absorbs end-of-stroke shock. As a rule of thumb, plan on roughly 34 N (about 3.4 kg of vertical lift with a margin) of real work at 0.5 MPa rather than the full rating. Speed range is 30-500 mm/s across 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 20 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 ACEJ12X20-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×20 | 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 ACEJ12X20-20S Is Used
Micro part ejection from fixtures
The 0-20 mm trimmed stroke nudges machined pins or SMD trays off a nest; 56.5 N at 0.5 MPa is enough for parts under 3 kg, and the fitted magnet confirms the eject position via CMSE switch.
Lab sample press station
A benchtop assay or capping jig uses the adjustable window to set an exact press depth per recipe; the TPU bumpers keep the 30-500 mm/s cycle quiet inside a compact enclosure.
Slide gate on a small feeder
The 12 mm bore meters granulate or pills through a 20 mm gate opening; the -S magnet and a DMSE switch verify gate open and closed without adding an external sensor bracket.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20S the Right Cylinder?
At this bore size, compare downward and upward: the ACEJ16 at the same 20 mm stroke gives 100.5 N push at 0.5 MPa if your part is heavier, while there is no smaller bore below 12 mm in the range. If 56.5 N push and 42.4 N pull cover your gripper or sensor-press load, stay at 12 mm for the smallest footprint. The stop screw is a mechanical end stop for the extend stroke only - it does not hold position if air is lost, so add a separate locking strategy for suspended loads. FA flange or LB foot mounts plus I/Y rod knuckles bolt to the ISO 21287 face, and the fitted -S magnet lets CMSE/DMSE switches report stroke 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 ACEJ12X20-20S 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. The ordered stroke is 20 mm and the -20 stop screw lets you shorten the extend stroke anywhere in a 0-20 mm window. The bore is 12 mm with a 6 mm rod, M3x0.5 female rod thread, M5x0.8 ports, and 50 mm is the maximum standard stroke for this bore.
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 tight jigs and guarded assemblies. The -S code means the position magnet is fitted on this model, so CMSE or DMSE reed or solid-state switches clamp into the body slots. Fixed TPU bumpers at both ends absorb end-of-stroke energy, and FA flange, LB foot or FTC brackets mount straight to the ISO 21287 face.
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