Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 45mm 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
- Stroke45 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 ACEJ12X45-20B
The ACEJ12X45-20B is a double acting ISO 21287 compact cylinder with a 12 mm bore and a 45 mm stroke that you can trim on site. A stop screw shortens the extend stroke by up to 20 mm, giving a usable range of 25-45 mm without swapping the cylinder. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N and 59.4 N 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, so it slots into slim fixtures, small gates and compact pick heads. Plan on roughly 34 N of real work at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a 6 mm S45C hard-chrome rod with a male thread (B code), and the M5x0.8 ports suit small air lines. Add the optional -S magnet if you later need CMSE or DMSE switch position signals.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACEJ12X45-20B Is Used
Miniature fixture clamping
Clamps small brackets or PCB-side jigs on assembly benches; the 34 N usable force at 0.5 MPa is enough for light hold-down, and the 25-45 mm range fits varying part heights.
Compact gate and chute diverting
Pushes small divert gates on packaging micro-lines where a full-length profile cylinder will not fit; the short body halves the mounting length.
Lab and test station ejection
Ejects sample trays or test coupons from small fixtures; the male rod thread (B) accepts custom tooling and the M5x0.8 ports keep tubing minimal.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20B the Right Cylinder?
At 56.5 N push at 0.5 MPa this 12 mm bore suits light clamping, part presence and small ejection tasks. Step down is rare at this size, but for near-zero force sensing a smaller custom unit would be needed; step up to the 16 mm bore (100.5 N push at 0.5 MPa) when loads approach 50 N. The 20 mm window means your shortest working stroke must stay at or above 25 mm. Remember the stop screw is an end stop only: on air loss the rod drifts, so do not rely on it to hold a load. FA flange or LB foot mountings bolt to the ISO 21287 face, and the male rod thread (B) takes your own coupling directly.
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 ACEJ12X45-20B FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa, 79.2 N push and 59.4 N pull; theoretical maximum is 11.5 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 45 mm extend stroke, so the working range is 25-45 mm. It is double acting, runs at 30-500 mm/s on 0.15-1.0 MPa (22-145 psi) air, and the stop is an end stop, not a mid-stroke lock.
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 fixed TPU bumper at each end to absorb end-of-stroke impact. Switches are possible only with the optional -S magnet code, which enables CMSE or DMSE reed or solid-state switches; this model (no S) has no magnet, so no sensor can be mounted. FA flange and LB foot mountings bolt to the standard ISO 21287 face.
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