Airtac ACE Compact Cylinder ACE25X55S
The AirTAC Airtac ACE Compact Cylinder ACE25X55S is a genuine double acting ISO 21287 compact air cylinder with a Ø25mm 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.
- BoreØ25 mm
- Stroke55 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACE Compact Cylinder ACE25X55S
This AirTAC ACE25X55S is a double acting ISO 21287 compact cylinder with a 25 mm bore and a 55 mm stroke, delivering a 245.4 N push force at 0.5 MPa. Its hard-anodized aluminium body is about 50% shorter than an ISO 15552 profile cylinder, so it fits into tight machine frames and guarding where a full-length cylinder will not. The rod is S45C carbon steel with hard-chrome plating, and the fixed TPU bumper at each end absorbs end-of-stroke impact.
With the optional -S magnet fitted, this unit works with CMSE or DMSE reed and solid-state switches for reliable position sensing. For a real-world load, plan on about 15 kg of safe vertical lift at 0.5 MPa, which is roughly 0.6 times the rated push force divided by gravity. The M5x0.8 port and female M6x1.0 rod thread make it easy to plumb and connect, and the operating pressure range is 0.15-1.0 MPa (22-145 psi) with a speed range of 30-500 mm/s.
Airtac ACE Compact Cylinder ACE25X55S Technical Specifications
| Model | Airtac ACE Compact Cylinder ACE25X55S |
|---|---|
| Series | ACE compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø25 mm |
| Stroke | 55 mm |
| Acting type | Double acting |
| 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 150 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACE Compact Cylinder ACE25X55S
| ACE | ISO 21287 compact cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| 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 ACE Compact Cylinder ACE25X55S Is Used
Compact Jig Clamping
Use this 55 mm stroke cylinder to clamp small parts in a CNC fixture where the short body clears the spindle guard, with the 245.4 N push force holding thin aluminum workpieces firmly.
Sorting Gate Actuator
Mount this cylinder on a packaging conveyor to divert lightweight cartons at a 55 mm stroke, using the M5x0.8 port for quick connection to a 5 mm air line and the -S magnet to confirm the gate position.
Lab Test Rig Pusher
In a materials testing rig, this cylinder pushes a probe 55 mm into a sample at a controlled speed up to 500 mm/s, with the fixed TPU bumper preventing shock to sensitive sensors at the end of travel.
Is the Airtac ACE Compact Cylinder ACE25X55S the Right Cylinder?
When sizing this ACE25X55S, compare it with the ACE20X55S, which offers a 157.1 N push at 0.5 MPa for lighter loads, or step up to the ACE32X55S with a 402.1 N push for heavier work. Since the stroke is 55 mm, well within the 150 mm maximum standard stroke for this bore, it is a standard off-the-shelf unit. Remember that a plain ACE cylinder does not hold its position when air pressure is lost or the valve is centered, so for holding a load, add a rod lock or pilot check valve. The FA/FB flange, LB foot, CA/CB clevis, and SDB pivot mounts all bolt directly to the ISO 21287 face, and the optional -S magnet is already fitted here for sensor feedback.
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 ACE Compact Cylinder ACE25X55S FAQ
At 0.5 MPa, the push force is 245.4 N and the pull force is 206.2 N. At 0.7 MPa, push is 343.6 N and pull is 288.6 N. The theoretical maximum force is 50.1 kgf at 1.0 MPa. The bore is 25 mm, the rod is 10 mm, and the port is M5x0.8.
The ACE25X55S body is about 50% shorter than an ISO 15552 profile cylinder, so it fits into tight spaces like machine guards and gantries. It has a fixed TPU bumper at both ends to absorb impact, and the optional -S magnet allows CMSE or DMSE switches to detect the rod position. Mounting options include FA/FB flange, LB foot, and CA/CB clevis.
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