Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50SB 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 ACEJ20X55-50SB
The ACEJ20X55-50SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Air drives the rod out and pulls it back, and an external stop screw trims the 55 mm stroke by up to 50 mm, giving a usable range of 5-55 mm without changing the cylinder. At 0.5 MPa this 20 mm bore pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it reaches 219.9 N on the extend side. In practice, plan on roughly 94 N of real work at 0.5 MPa, which is about 9 kg of vertical lift with a 2:1 margin - enough for small clamps, gates and part pushers.
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 will not fit. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, a fixed TPU bumper sits at both ends, and the male rod thread (B code) bolts straight into standard knuckles. This model carries the optional -S magnet, so CMSE / DMRE-free CMSE / DMSE reed or solid-state switches can be mounted anywhere along the body slots.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50SB |
|---|---|
| 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 ACEJ20X55-50SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | 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 ACEJ20X55-50SB Is Used
Small jig clamping
With 157.1 N push at 0.5 MPa and a trim range of 5-55 mm, this bore holds light fixtures and drill jigs where clamp position must be dialled in on site.
Packaging line part pushers
The compact body fits beside narrow conveyor frames, and the adjustable stop lets one cylinder serve cartons of different widths without re-plumbing.
Position-verified ejectors
The fitted -S magnet works with CMSE / DMSE switches so the PLC confirms full extension on small electronics or lab automation strokes.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-50SB the Right Cylinder?
Size both ways before ordering: the 16 mm bore gives 100.5 N push at 0.5 MPa if your load is lighter, while the 25 mm bore delivers 245.4 N push if you need more headroom at the same stroke class. Remember the stop screw only shortens the extend stroke - it is a mechanical end stop, not a mid-stroke lock, so the rod will drift if air is lost. For foot or flange fixing add LB or FA; order CMSE or DMSE switches to pair with the -S magnet already fitted on this model.
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 ACEJ20X55-50SB FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push rises to 219.9 N and pull to 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The 55 mm stroke can be shortened by up to 50 mm via the external stop screw, giving a 5-55 mm working range. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the port is M5x0.8.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, hard-chrome S45C rod and fixed TPU bumpers at both ends, saving about 50% of the mounting length of an ISO 15552 profile cylinder. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots. FA flange, LB foot and I/Y rod knuckles bolt to the standard ISO 21287 face.
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