Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30S 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 ACEJ20X50-30S
The ACEJ20X50-30S is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 50 mm stroke by up to 30 mm, giving a usable range of 20-50 mm on site. At 0.5 MPa the 20 mm bore pushes 157.1 N and pulls 117.8 N, enough for light clamping and positioning work in tight fixtures. The hard-anodized aluminium body with an S45C hard-chrome plated rod runs at 0.15-1.0 MPa (22-145 psi) and 30-500 mm/s.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into compact jigs and gantries where a full-length cylinder will not fit. Because the magnet is fitted (the -S code), CMSE / DMSE reed or solid-state switches can be mounted directly in the body slots for end-of-stroke signalling. As a rule of thumb, plan for about 94 N of usable push at 0.5 MPa, which lifts roughly 9 kg vertically with a 2:1 margin - handy when matching the cylinder to a real part weight.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30S |
|---|---|
| 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 ACEJ20X50-30S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -30 | 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 ACEJ20X50-30S Is Used
Small-part jig clamping
The 157.1 N push at 0.5 MPa secures brackets or housings in drilling and assembly jigs, and the 20-50 mm adjustable range lets one cylinder serve several fixture variants.
Indexing with position feedback
With the -S magnet fitted, CMSE or DMSE switches signal end positions on a pick-and-place slide moving parts between assembly stations at up to 500 mm/s.
Compact ejection in packaging heads
The short body, about 50% shorter than an ISO 15552 profile cylinder, ejects cartons or blisters from tight packaging machine frames where space is limited.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30S the Right Cylinder?
Size both ways before committing: 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 if you need more headroom. 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. This model carries the optional -S magnet, so CMSE / DMSE switches work out of the box; FA flange and LB foot mounts plus I/Y rod knuckles bolt straight to the ISO 21287 face.
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 ACEJ20X50-30S 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; theoretical maximum is 32 kgf at 1.0 MPa. The -30 code is a 30 mm adjustment window: an external stop screw shortens the 50 mm extend stroke by up to 30 mm, so the working range is 20-50 mm. It shortens the stroke only - it never lengthens it past 50 mm, and it is an end stop, not a load-holding brake.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at both ends to absorb end-of-stroke energy. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots. FA flange, LB foot mounts and I/Y rod knuckles attach to the standard ISO 21287 face; the rod end is female M6x1.0 and the port is M5x0.8.
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