Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20SB 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 ACEJ12X20-20SB
The ACEJ12X20-20SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 20 mm stroke anywhere in a 0-20 mm window, so one unit can be tuned on the machine without swapping parts. At 0.5 MPa this 12 mm bore 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.
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 compact test rigs. Because the -S code is ordered, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be mounted directly in the body slots. The B code gives a male 6 mm rod thread, and the fixed TPU bumper at each end absorbs end-of-stroke shock. As a rule of thumb, plan on roughly 34 N (about 3.5 kg vertical equivalent) of real work at 0.5 MPa rather than the full rating.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20SB |
|---|---|
| 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 ACEJ12X20-20SB
| 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 ACEJ12X20-20SB Is Used
Micro part ejection
Ejecting small stamped terminals or connector pins from a compact die, where the 56.5 N push at 0.5 MPa is enough and the 0-20 mm trim lets you match the exact ejection distance.
Lab sample indexing
Advancing sample vials or slides one station in benchtop analytical equipment, using the fitted -S magnet with CMSE switches to confirm each 20 mm or shorter advance.
Small carton hold-down
Pressing a lightweight flap or label flat on a compact packaging head, where the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder inside tight guards.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X20-20SB the Right Cylinder?
For this force class, compare both neighbours: a 16 mm bore gives 100.5 N push at 0.5 MPa if your clamp load creeps up, while stepping down is not possible below 12 mm in this series, so the 12 mm is the light-duty entry point. If the stroke may grow later, note the max standard stroke for bore 12 is 50 mm and longer strokes are made to order. The male rod thread (B) suits rod knuckles such as the I or Y types, FA flange or LB foot mounting bolts to the ISO 21287 face, and the fitted -S magnet lets you add CMSE / DMSE switches for end-position sensing. Remember the stop screw is a mechanical end stop only: on air loss the piston drifts, so it is not a load-holding lock.
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 ACEJ12X20-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N; the theoretical maximum is 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, speed range 30-500 mm/s, air filtered to 40 um, and -20 to +70 C temperature. The extend stroke is 20 mm, adjustable down to 0 mm via the stop screw within the -20 window.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, S45C hard-chrome plated 6 mm rod and threaded aluminium covers, roughly 50% shorter in mounting length than an ISO 15552 profile cylinder. A fixed TPU bumper at each end absorbs end-of-stroke energy. The -S magnet on this model accepts CMSE / DMSE reed or solid-state switches, and FA flange, LB foot or FTC brackets plus I/Y rod knuckles bolt to the standard face; the port is M5x0.8.
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