Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40B 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 ACEJ20X55-40B
The ACEJ20X55-40B is a double acting ISO 21287 compact cylinder with a trimmable extend stroke: an external stop screw shortens the 55 mm stroke by up to 40 mm, giving a usable range of 15-55 mm without swapping the cylinder. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight fixture plates and guarding where a full-length body will not fit.
In practice that 157.1 N push means roughly 94 N of real work at 0.5 MPa, and vertically it lifts about 8 kg with a 2:1 margin. The male rod thread (B code) bolts straight to external tooling, the fixed TPU bumper at each end absorbs end-of-stroke impact, and the hard-anodized aluminium body with an S45C hard-chrome rod stands up to continuous cycling at 30-500 mm/s. Note that no magnet is fitted on this version; order the optional -S code if you later need CMSE / DMSE switch position feedback.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40B |
|---|---|
| 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 ACEJ20X55-40B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -40 | 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 ACEJ20X55-40B Is Used
Bench-top press fixture
A 15-55 mm trimmed extend stroke lets one cylinder serve several small staking and marking dies on a jig plate, with about 8 kg of vertical margin for light pressing work at 0.5 MPa.
Compact assembly module
The short ISO 21287 body fits inside a slim pick-and-place gantry where a full-length profile cylinder would overhang, and the male rod thread picks up gripper tooling directly.
Stop-and-eject station
On a conveyor line the stop screw sets the exact extend position for part ejection between 15 and 55 mm, and the fixed TPU bumpers quiet the end-of-stroke impact at cycling speeds up to 500 mm/s.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40B the Right Cylinder?
Size by force first: if 157.1 N push at 0.5 MPa is marginal for your tooling mass, step up to the 25 mm bore (245.4 N push at 0.5 MPa); if you need less force and a shorter body, the 16 mm bore gives 100.5 N. The stop screw is a mechanical end stop for the extend stroke only - it does not lock the piston mid-stroke, so on air loss the rod will drift and a separate holding method is needed for suspended loads. Match FA flange or LB foot mounts to your fixture, and remember the male rod thread here suits couplings that thread onto the rod rather than female-tapped tooling.
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 ACEJ20X55-40B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. 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 air supply should be filtered to 40 um. The 55 mm stroke is adjustable down to 15 mm via the 40 mm stop-screw window, and the port is M5x0.8.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA flange and LB foot options on the standard mounting face and a fixed TPU bumper at each end. Position sensing is not included: this model has no magnet fitted, so add the optional -S magnet code to enable CMSE or DMSE switches on the body slots.
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