Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 ACEJ20X50-50
This ACEJ20X50-50 is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw can trim anywhere in a 0-50 mm window on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. In practice plan on roughly 94 N of real work at 0.5 MPa, which corresponds to lifting about 8 kg vertically with a 2:1 margin.
The hard-anodized aluminium body with an S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding. A fixed TPU bumper sits at both ends, speed runs 30-500 mm/s, and the optional -S code adds a magnet for CMSE / DMSE switches - without it no magnet is fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 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 ACEJ20X50-50
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-50 Is Used
Small-part press fitting
Trims the 50 mm extend stroke down to the exact depth needed to seat bearings or bushings in electronics and small assembly fixtures, with about 94 N of usable force at 0.5 MPa.
Pick-and-place on compact gantries
The short ISO 21287 body fits where a full-length profile cylinder will not, and the 8 kg vertical-lift equivalent covers lightweight plastic housings and connectors.
Adjustable ejector stations
On packaging and sorting lines, the stop screw lets one cylinder serve multiple product heights within the 0-50 mm window without changing hardware.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50 the Right Cylinder?
At 157.1 N push (0.5 MPa) this 20 mm bore suits light clamping and small part handling; step down to the 16 mm bore (100.5 N) for lighter loads or up to the 25 mm bore (245.4 N) when more force is needed. The stop screw only shortens the extend stroke and is not a mid-stroke lock - on air loss the piston drifts, so add a valve or external stop to hold position. Match FA flange or LB foot mounts and the I/Y rod knuckles to your fixture, and order the -S variant if CMSE / DMSE position sensing is required.
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 ACEJ20X50-50 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, air filtered to 40 um, and -20 to +70 C temperature range. The rod is 10 mm with an M6x1.0 female thread and the port is M5x0.8 (PT).
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA flange and LB foot options plus I/Y rod knuckles bolting straight to the standard face. A fixed TPU bumper at each end absorbs end-of-stroke energy. Sensing requires the optional -S magnet code - with it, CMSE / DMSE switches mount in the body slots; without -S no magnet is fitted and no switch can be read.
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