Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40SB 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 ACEJ20X55-40SB
The ACEJ20X55-40SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 55 mm stroke by up to 40 mm, giving a usable range of 15-55 mm on site. At 0.5 MPa the 20 mm bore pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa. The male rod thread (B code) bolts straight into knuckle joints, and the fitted -S magnet accepts CMSE / DMSE switches for end-position sensing.
The hard-anodized aluminium body with S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight pick-and-place heads and guarding. Running on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um at 30-500 mm/s, it carries fixed TPU bumpers at both ends. As a rule of thumb, plan on roughly 94 N (about 9.6 kg) of real work at 0.5 MPa, which lifts about 4.9 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40SB |
|---|---|
| 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 ACEJ20X55-40SB
| 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 ACEJ20X55-40SB Is Used
Small-part ejection from plastic moulds
The 157.1 N push at 0.5 MPa is enough to tip finished caps or bushings off a moulding nest, and the 15-55 mm trim lets one cylinder serve several cavity depths.
Pick-and-place lift on compact gantries
With about 4.9 kg vertical lift at a 2:1 margin, the male-threaded rod suits gripper knuckles on short-stroke Z axes where a full-length profile cylinder will not fit.
Position-verified test fixtures
The fitted -S magnet works with CMSE / DMSE switches so a QC bench can confirm the trimmed extend stroke before a probe cycle starts.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40SB the Right Cylinder?
Size against neighbours: the 16 mm bore gives 100.5 N push at 0.5 MPa while the 25 mm bore reaches 245.4 N, so the 20 mm bore at 157.1 N sits squarely in the middle for light clamping and transfer. The 40 mm window means you can dial the extend stroke anywhere from 15 mm to the full 55 mm, but remember the stop screw is a mechanical end stop, not a mid-stroke lock - on air loss the piston still drifts. Order FA flange or LB foot brackets, add I or Y rod knuckles for the male thread, and note the magnet is the optional -S code, which this model already carries.
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 ACEJ20X55-40SB 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; theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um, port M5x0.8, rod 10 mm with male thread.
The -40 code sets a 40 mm adjustment window: an external stop screw shortens the 55 mm extend stroke to any value from 15 mm upward. Fixed TPU bumpers absorb end-of-stroke energy at both ends. The body carries the optional -S magnet (fitted here), so CMSE / DMSE reed or solid-state switches can be clamped into the body slots for end-position feedback.
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