Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 55mm 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
- Stroke55 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 ACEJ20X55-30S
The ACEJ20X55-30S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 55 mm stroke that an external stop screw trims on site. The -30 code sets a 30 mm adjustment window, so the extend stroke can be shortened anywhere in a 25-55 mm range without changing the cylinder. 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 maximum of 32 kgf at 1.0 MPa.
Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which makes it a natural fit for tight jigs, guarding and small gantries. A practical sizing rule: plan for roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. This -S version carries the optional magnet, so CMSE / DMSE reed or solid-state switches can be clipped onto the body for end-of-stroke sensing. FA flange, LB foot and I/Y rod knuckles bolt straight to the ISO 21287 face.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 55 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 ACEJ20X55-30S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | 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 ACEJ20X55-30S Is Used
Small jig clamping
A 20 mm bore gives 157.1 N push at 0.5 MPa, enough to clamp brackets or PCB fixtures in compact machining jigs where the 25-55 mm trimmed stroke matches varying part heights.
Gated ejection with sensing
The fitted -S magnet lets CMSE / DMSE switches confirm each eject stroke on assembly lines, while the short body slots into narrow gantry frames.
Benchtop press assist
At 0.7 MPa the bore reaches 219.9 N push, useful for light pressing of bushings or labels on a bench fixture, with the stop screw set per product variant.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30S the Right Cylinder?
Check the load both ways before committing. At 0.5 MPa this bore delivers 157.1 N push and 117.8 N pull; if your tooling needs more, step up to the 25 mm bore (245.4 N push) or down to the 16 mm bore (100.5 N push). Remember the stop screw is a mechanical end stop only - on air loss the piston drifts, so do not treat it as a load-holding lock. Match FA or LB mounting and the female M6x1.0 rod thread to your fixture, and keep the -S magnet in the code if CMSE / DMSE switching is planned.
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 ACEJ20X55-30S FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push rises to 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. It runs double acting 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, with a fixed TPU bumper at both ends and an M5x0.8 port.
The -30 code is a 30 mm window: an external stop screw shortens the 55 mm extend stroke to any length down to 25 mm. The TPU bumper only decelerates at the ends and never holds a load. Because this is the -S version, the magnet is fitted, so CMSE / DMSE reed or solid-state switches mount directly on the hard-anodized aluminium body; FA flange, LB foot and I/Y knuckles attach to the ISO 21287 face.
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