Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm 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.
- BoreØ12 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B
The ACEJ12X50-20B is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. The -20 code gives a 20 mm adjustment window: an external stop screw trims the 50 mm stroke on site, so the usable extend range is 30-50 mm without changing the cylinder.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why this size fits inside slim pick-and-place heads and small fixtures. A hard-anodized aluminium body carries an S45C hard-chrome plated 6 mm rod, and a fixed TPU bumper at each end absorbs end-of-stroke shock. In practice, plan on roughly 34 N of usable push at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. Note this unit has no magnet fitted; order the -S code if you later need CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| 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 50 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 (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 57 N | 42 N |
| 0.7 MPa | 79 N | 59 N |
| Max (@1.0 MPa) | 12 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 ACEJ12X50-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | 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 ACEJ12X50-20B Is Used
Micro part ejection from small molds
The 56.5 N push at 0.5 MPa is enough to strip tiny plastic or metal parts from shallow mold cavities, while the 30-50 mm adjustable range lets operators set the ejection depth per tool.
Compact gating on small conveyor lines
With a body about 50% shorter than an ISO 15552 profile cylinder, this 12 mm unit slides into tight conveyor frames to push small cartons or vials off a 60-100 mm belt lane.
Sample press in lab automation
About 34 N of practical working force seats microplates, caps or probes in diagnostic instruments, and the stop screw allows repeatable, tool-free stroke tuning between assay formats.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-20B the Right Cylinder?
At this bore size the choice is between the 12 mm (56.5 N push at 0.5 MPa) and the 16 mm (100.5 N push at 0.5 MPa); step up to 16 mm if your part or tooling mass approaches the 2.9 kg vertical-lift equivalent of the 12 mm bore. The 20 mm adjustment window suits stations where the exact stop position is tuned during commissioning. Remember the stop screw is a mechanical end stop only: on air loss the piston drifts, so it does not hold a load mid-stroke. The male rod thread (B code) suits external knuckles, and FA flange or LB foot mounts bolt to the standard ISO 21287 face. PT ports, M5x0.8.
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 ACEJ12X50-20B FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N. The theoretical maximum is 11.5 kgf at 1.0 MPa. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), at 30-500 mm/s and -20 to +70 C. The -20 stop screw trims the 50 mm extend stroke anywhere down to 30 mm.
It is an ISO 21287 compact cylinder: hard-anodized aluminium body, threaded aluminium covers, a 6 mm hard-chrome plated S45C rod and a fixed TPU bumper at each end that only decelerates the piston at the ends. Mounting uses the standard ISO 21287 face with FA flange or LB foot options plus I/Y rod knuckles. Sensing requires the optional -S magnet, which enables CMSE / DMSE switches; this model without the S code carries no magnet, so no switch can be mounted.
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