Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 50mm stroke, 1/8" 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
- Stroke50 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- 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 ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20
The ACEJ20X50-20 is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw trims on site. The -20 code gives a 20 mm adjustment window, so the extend stroke can be set anywhere from 30 to 50 mm without changing hardware. 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.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarded cells. In practice, plan for roughly 94 N of usable push at 0.5 MPa, and expect it to lift about 8 kg vertically once a 2:1 margin is applied. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, a fixed TPU bumper sits at each end, and the optional -S magnet enables CMSE / DMSE switches - this unit has no magnet fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| 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 ACEJ20X50-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -20 | 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 ACEJ20X50-20 Is Used
Small-parts ejection from plastic molds
A 30-50 mm adjustable push clears finished clips or caps off a mold face; 157.1 N at 0.5 MPa handles light ejection pins without oversizing the tool.
Clamping on a benchtop drilling fixture
Roughly 94 N of practical clamping force holds aluminum brackets against a drill jig, and the stop screw lets one cylinder serve several part heights.
Reject pusher on a packaging line
The compact body fits beside a narrow conveyor, kicking off underweight cartons within the 30-500 mm/s speed range.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-20 the Right Cylinder?
Compare both directions before committing: the smaller ACEJ16 bore delivers 100.5 N push at 0.5 MPa, while the ACEJ25 steps up to 245.4 N. If your tooling needs more than about 94 N of working force, stay with the 20 mm bore. The stop screw only shortens the extend stroke and drifts on air loss, so it is not a load holder. FA flange or LB foot mounts bolt to the ISO 21287 face, and ordering the -S version adds the magnet for CMSE / DMSE 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 ACEJ20X50-20 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push reaches 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. The 50 mm stroke is trimmed by the stop screw within the -20 window, giving a usable extend range of 30-50 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the air port is 1/8" with a female M6x1.0 rod thread.
The ISO 21287 body is about 50% shorter in mounting length than an ISO 15552 profile cylinder, with a hard-anodized aluminium barrel and an S45C hard-chrome rod. A fixed TPU bumper at each end absorbs end-of-stroke impact only - it never locks or holds a load. FA flange and LB foot mounts fit the standard face, and the optional -S magnet allows CMSE / DMSE switch mounting; without it no sensor can be attached.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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