Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30SB 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 ACEJ20X50-30SB
The ACEJ20X50-30SB is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 50 mm stroke that an external stop screw trims by up to 30 mm, giving a usable extend range of 20-50 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N, with a theoretical 32 kgf at 1.0 MPa. The male rod thread (B code) suits external tooling, and the fitted -S magnet lets CMSE / DMSE switches report end positions.
Because the short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight jigs, guarding and gantries where a full-length body will not fit. A practical sizing rule: plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, fixed TPU bumpers sit at both ends, and the cylinder runs 30-500 mm/s on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30SB |
|---|---|
| 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 ACEJ20X50-30SB
| 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 ACEJ20X50-30SB Is Used
Small-part ejection from injection molds
The 157.1 N push at 0.5 MPa clears finished clips or bushings off a mold face, and the 20-50 mm trimmed stroke matches shallow cavity depth without re-plumbing.
Position-verified clamping on assembly benches
With the fitted magnet, CMSE or DMSE switches confirm the rod has reached the trimmed stop before the operator releases the part.
Press-fitting dowels into 3D-printed and plastic housings
About 94 N of usable force at 0.5 MPa seats small dowels gently, and the male rod thread accepts a custom press tip directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30SB the Right Cylinder?
At 157.1 N push at 0.5 MPa this 20 mm bore sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N), so pick the 16 for lighter pick-and-place and step up to 25 when the load grows. The stop screw is a mechanical end stop only: it shortens the extend stroke within the 30 mm window but never holds a load if air is lost. FA flange or LB foot mountings bolt to the ISO 21287 face, and this unit already carries the optional -S magnet, so CMSE / DMSE switches can be fitted without reordering.
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 ACEJ20X50-30SB 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 -30 code sets a 30 mm adjustment window: an external stop screw shortens the 50 mm extend stroke on site, so the working range is 20-50 mm. It shortens the stroke only and acts as an end stop, not a load brake.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits cramped fixtures. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clamped to the body for end-position signals. FA flange and LB foot mountings plus I and Y rod knuckles bolt straight to the standard face, and a fixed TPU bumper at each end absorbs end-of-stroke shock.
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