Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20 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 ACEJ20X45-20
Double acting and built to the ISO 21287 compact format, the ACEJ20X45-20 pairs a 20 mm bore with a 45 mm stroke that an external stop screw trims on site by up to 20 mm, giving a usable extend range of 25-45 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa, with a theoretical ceiling of 32 kgf at 1.0 MPa. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, and fixed TPU bumpers absorb end-of-stroke shock at both ends.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs, guarding and gantry frames. FA flange and LB foot mounts plus I/Y rod knuckles bolt straight to the ISO 21287 face. As a rule of thumb, plan on roughly 94 N (about 9.6 kg) of real work at 0.5 MPa, and for vertical lifts halve the 16 kgf equivalent to lift about 8 kg with a 2:1 margin. Note this unit ships without a magnet: order the -S code if you need CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20 |
|---|---|
| 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 ACEJ20X45-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | 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 ACEJ20X45-20 Is Used
Small-parts press fitting
Trim the stroke to 25-45 mm to seat bearings or bushings in electronics and small appliance assemblies, using the 157.1 N push at 0.5 MPa for light interference fits.
Packaging line part stoppers
The 45 mm stroke with a 20 mm trim window lets one cylinder serve several bottle or carton lanes, and the compact body fits under low conveyor guarding.
Lab and test fixture actuation
Lifts about 8 kg vertically with a 2:1 margin, enough for raising sample trays or probe heads in benchtop test rigs where a full-length cylinder will not fit.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20 the Right Cylinder?
At 157.1 N push and 117.8 N pull at 0.5 MPa, the 20 mm bore suits light clamping, ejecting and positioning. Step down to the 16 mm bore (100.5 N push) for lighter loads, or up to the 25 mm bore (245.4 N push) when the job needs more muscle at the same pressure. Remember the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock, so the rod still drifts if air is lost. If position feedback matters, specify the -S magnet variant; FA flange or LB foot mounting matches standard ISO 21287 fixtures.
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 ACEJ20X45-20 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; theoretical maximum is 32 kgf at 1.0 MPa. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s. The extend stroke is adjustable from 45 mm down to 25 mm via the stop screw, with a fixed TPU bumper at each end and an M5x0.8 port.
The ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow fixtures and tight machine frames. FA flange, LB foot, FTC brackets and I/Y rod knuckles mount directly. Sensing is optional: this model has no magnet, so order the -S code to enable CMSE / DMSE reed or solid-state switches along the body's magnet slots.
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