Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50B 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 ACEJ20X50-50B
The ACEJ20X50-50B is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 50 mm stroke anywhere from 0 to 50 mm on site, so one unit covers several fixture positions. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs and guarded stations. For sizing, treat roughly 94 N (about 0.6 of the push force) as the practical working effort, and expect it to lift about 8 kg vertically with a 2:1 margin. The rod end is male thread (B code), the port is M5x0.8, and a fixed TPU bumper sits at both ends.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50B |
|---|---|
| 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 ACEJ20X50-50B
| 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 ACEJ20X50-50B Is Used
Small-part ejection from molds
The 0-50 mm trim lets one cylinder serve several shallow mold cavities, with 157.1 N push at 0.5 MPa enough to kick 8 kg-class parts clear of the tool.
Clamping on compact rotary indexing tables
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits under low tooling plates where a full-length body cannot.
Dispense or test-head press in lab automation
Male rod thread (B code) accepts threaded probes directly, and the stop screw sets a repeatable 0-50 mm extend position for each recipe.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50B the Right Cylinder?
At this force class the 20 mm bore sits between the 16 mm bore (100.5 N push at 0.5 MPa) and the 25 mm bore (245.4 N push at 0.5 MPa); step up if your tooling mass approaches the 8 kg vertical-lift figure. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock, so the rod will drift if air is lost. FA flange or LB foot mountings bolt to the ISO 21287 face, and if you later need position sensing, order the -S variant with the optional magnet for CMSE / DMSE switches - this model has no magnet fitted.
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 ACEJ20X50-50B FAQ
Push 157.1 N and pull 117.8 N at 0.5 MPa; push 219.9 N and pull 164.9 N at 0.7 MPa; theoretical maximum 32 kgf at 1.0 MPa. It is double acting with a 50 mm stroke adjustable from 0 to 50 mm via the external stop screw, running on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, temperature -20 to +70 C, proof pressure 1.5 MPa (215 psi).
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, S45C hard-chrome-plated 10 mm rod, M5x08 port and fixed TPU bumpers at both ends. This version has a male rod thread and PT ports. No magnet is fitted; order the -S code to get the optional magnet so CMSE / DMSE switches can be mounted. FA flange and LB foot mountings fit the standard ISO 21287 face.
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