Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-30
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-30 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke45 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 ACEJ20X45-30
The ACEJ20X45-30 is a double acting compact cylinder built to ISO 21287, with a 20 mm bore and a 45 mm stroke that an external stop screw trims on site by up to 30 mm, giving a usable extend range of 15-45 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical peak of 32 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 tight fixtures, guards and slide assemblies a full-length body cannot reach.
For real-world sizing, plan on roughly 94 N of usable push at 0.5 MPa rather than the full rating, which means this unit lifts about 8 kg vertically once you keep a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod with an M6x1.0 female thread, an M5x0.8 air port, a fixed TPU bumper at each end and a speed window of 30-500 mm/s. Note that the stop screw sets the end of stroke only - it is not a mid-stroke lock, so the rod still drifts if air is lost.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-30 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-30 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 45 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 ACEJ20X45-30
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | 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 ACEJ20X45-30 Is Used
Small-part press fitting
Snapping bearings or bushings into aluminium housings on an assembly bench, where the 157.1 N push at 0.5 MPa suits light interference fits and the 15-45 mm trim range matches varying part heights.
Pick-and-place lift of jigs
Raising fixture plates or small workpiece pallets of about 8 kg or less between two levels of a compact indexing table, using the short body where a longer profile cylinder will not fit.
Gated ejection on test rigs
Kicking rejected components off a conveyor-mounted inspection station, with the -S magnet option enabling CMSE or DMSE switches to confirm extend and retract positions.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-30 the Right Cylinder?
Check the load both ways before committing: the next bore down, ACEJ16, delivers 100.5 N push at 0.5 MPa, while the bore 25 ACEJ25 reaches 245.4 N, so the 20 mm sits comfortably in the light clamping and lifting band. If your part weighs more than about 8 kg for vertical lift, step up a bore. The 45 mm stroke is well inside the 100 mm maximum standard stroke for this bore, and the -30 window lets maintenance shorten the extend stroke without swapping the cylinder.
Mount with FA flange or LB foot hardware on the ISO 21287 face, and add I or Y rod knuckles where the tooling needs a bit of angular freedom. If you want position feedback, order the -S variant - without that code there is no magnet and no CMSE / DMSE switch can be fitted.
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 ACEJ20X45-30 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The bore is 20 mm with a 10 mm rod, the port is M5x0.8, the rod end thread is female M6x1.0, and the extend stroke is adjustable from 15-45 mm via the -30 stop screw. Operating pressure is 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, and the fluid is air filtered to 40 um.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange or LB foot brackets bolt straight to its standard face. A fixed TPU bumper at each end absorbs end-of-stroke impact, though it never holds or brakes a load - on air loss the rod drifts. Sensing requires the optional -S magnet code; this model without -S carries no magnet, so CMSE / DMSE switches cannot be mounted unless you order the -S version.
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