Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-50B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-50B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 90mm 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
- Stroke90 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 ACEJ20X90-50B
The ACEJ20X90-50B is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 90 mm stroke that an external stop screw trims by up to 50 mm, giving a usable extend range of 40-90 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical 32 kgf at 1.0 MPa. The male rod thread (B code) suits external rod accessories, and the M5x0.8 ports keep the plumbing small.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body cannot. In practice, plan for about 94 N of real work at 0.5 MPa, which corresponds to lifting roughly 4.8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke energy, the hard-anodized aluminium body runs 30-500 mm/s on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), and the optional -S magnet enables CMSE / DMSE switches (this model has no magnet fitted).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-50B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-50B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 90 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 ACEJ20X90-50B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×90 | Stroke length in mm. |
| -50 | 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 ACEJ20X90-50B Is Used
Fixture clamping on CNC pallets
The 157.1 N push at 0.5 MPa clamps small aluminium or plastic workpieces, and the 40-90 mm trim range lets one cylinder serve several pallet sizes.
Small part ejection from stamping dies
With about 4.8 kg of vertical lift capacity at a 2:1 margin, the male-threaded rod pushes finished blanks off the die face stroke after stroke.
Gated indexing on compact conveyor lines
The short ISO 21287 body fits under low guarding, and adding the -S magnet code allows CMSE / DMSE switches to confirm gate position.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X90-50B the Right Cylinder?
Size this 20 mm bore when your load needs roughly 157 N of push at 0.5 MPa; step down to the 16 mm bore (100.5 N push) for lighter clamping or up to the 25 mm bore (245.4 N push) for heavier work. The 50 mm window means you can dial the extend stroke anywhere from 40 to 90 mm, but remember the stop screw is a mechanical end stop only - it does not lock the piston if air is lost. Bolt on FA flange or LB foot mounts plus I/Y rod knuckles, and order the -S code if you need CMSE / DMSE position sensing.
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 ACEJ20X90-50B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The -50 code is a 50 mm adjustment window: an external stop screw shortens the 90 mm extend stroke by up to 50 mm, so the usable range is 40-90 mm. It shortens the stroke only - it cannot lengthen it, and it is not a mid-stroke lock, so the rod still drifts if air pressure is lost.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. Sensing is not included by default: order the optional -S magnet code to enable CMSE / DMSE switches, since without -S there is no magnet in the piston. Mounting options include FA flange and LB foot, and the rod end on this model is male thread (B).
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