Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30B 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 ACEJ20X50-30B
The ACEJ20X50-30B is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 50 mm stroke that an external stop screw trims on site within a 30 mm window, giving a usable extend range of 20-50 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa. The male rod thread (B code) bolts straight to tooling, and the PT port is M5x0.8.
The hard-anodized aluminium body with an S45C hard-chrome rod keeps the mounting length about 50% shorter than an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding. In practice, plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. The optional -S magnet enables CMSE / DMSE switches; without it no magnet is fitted. Speed range is 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30B |
|---|---|
| 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 ACEJ20X50-30B
| 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 ACEJ20X50-30B Is Used
Small-parts ejection in plastic molding
The 157.1 N push at 0.5 MPa clears finished clips or bushings from a mold nest, and the 20-50 mm adjustable range lets one cylinder serve several cavity depths.
Clamping on compact CNC fixtures
About 94 N of usable holding force at 0.5 MPa secures aluminum brackets in a machining jig, with the short body fitting where a full-length profile cylinder cannot.
Product diverting on packaging lines
The male-thread rod drives a pusher finger that diverts cartons at 30-500 mm/s, and the 30 mm trim window dials the throw to match lane width without re-plumbing.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-30B the Right Cylinder?
For this force class, compare both directions: the 20 mm bore gives 157.1 N push / 117.8 N pull at 0.5 MPa, while a 16 mm bore manages 100.5 N push and a 25 mm bore reaches 245.4 N push at the same pressure. Step up to 25 mm if your pull-side load exceeds about 118 N. Note the stop screw is a mechanical end stop only - on air loss the piston still drifts, so do not use it to hold a load mid-stroke. FA flange or LB foot mounts and I/Y rod knuckles fit the ISO 21287 face; order the -S code if you need CMSE / DMSE position sensing.
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 ACEJ20X50-30B FAQ
At 0.5 MPa: 157.1 N push and 117.8 N pull. 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), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um. The extend stroke is adjustable from 20 to 50 mm via the stop screw, 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 a fixed TPU bumper at both ends to absorb end-of-stroke energy. Sensing requires the optional -S magnet code; this model has no magnet fitted, so no CMSE or DMSE switch can be read until you order the -S version.
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