Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10SB 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 ACEJ20X55-10SB
The ACEJ20X55-10SB is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 55 mm stroke that can be trimmed on site. An external stop screw shortens the extend stroke by up to 10 mm, giving a usable range of 45-55 mm without swapping the cylinder. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. In practice, plan on roughly 94 N of real work at 0.5 MPa, which lifts about 4.8 kg vertically with a 2:1 margin - enough for small clamps, gates and light pick-and-place parts.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarded cells. The hard-anodized aluminium body carries an S45C hard-chrome plated 10 mm rod with a male thread (the B code), and fixed TPU bumpers absorb end-of-stroke energy at both ends. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted anywhere along the body for end-of-stroke signalling. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s, from -20 to +70 C.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10SB |
|---|---|
| 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 ACEJ20X55-10SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -10 | 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 ACEJ20X55-10SB Is Used
Small fixture clamping
Trims between 45 and 55 mm to clamp brackets or machined blanks on a jig, using about 94 N of usable force at 0.5 MPa for light holding duty.
Conveyor gate diverter
Pushes light product stops or divert gates on packaging lines; the 157.1 N push at 0.5 MPa and 30-500 mm/s speed suit fast, short-throw gating.
Position-signalled ejector
Ejects small parts from a nest with CMSE or DMSE switch feedback, since the -S magnet is fitted on this model for end-of-stroke detection.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-10SB the Right Cylinder?
Size against neighbours: the 16 mm bore gives 100.5 N push at 0.5 MPa, while stepping up to 25 mm raises it to 245.4 N - choose this 20 mm model when your load sits between those figures and you need the 45-55 mm adjustable window. The stop screw is a mechanical end stop only; it trims the extend stroke but does not lock the piston, so on air loss the rod will drift. Mount with FA flange or LB foot on the ISO 21287 face, and add I or Y rod knuckles if side alignment matters. The -S magnet is already fitted here, so CMSE / DMSE switches work out of the box.
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 ACEJ20X55-10SB 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; the theoretical maximum is 32 kgf at 1.0 MPa. The -10 code is a 10 mm adjustment window: an external stop screw shortens the 55 mm extend stroke to any setting from 45 to 55 mm. It is a mechanical end stop, not a mid-stroke lock, so the rod can drift if air 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, a hard-chrome plated 10 mm male-thread rod and fixed TPU bumpers at both ends. The -S magnet is fitted on this model, so CMSE / DMSE reed or solid-state switches can be slid along the body slots. Mounting uses FA flange or LB foot brackets plus I/Y rod knuckles; the port is M5x0.8 and the rod thread is male.
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