Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B is a genuine double acting, double rod, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 20mm stroke, 1/8" 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
- Stroke20 mm
- Port size1/8"
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B
A double acting compact cylinder built to ISO 21287, the ACEJ20X20-20B uses a 20 mm bore and a 20 mm stroke that an external stop screw can trim anywhere in a 0-20 mm window on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, enough for light clamping, ejecting and indexing work. The male rod thread from the B code bolts directly to your tooling.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into cramped fixtures and guard spaces. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the hard-anodized aluminium body with an S45C hard-chrome plated 10 mm rod stands up to continuous cycling at 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 20 mm |
| Acting type | Double acting, double rod, adjustable stroke |
| Port size | 1/8" |
| 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 118 N |
| 0.7 MPa | 165 N |
| Max (@1.0 MPa) | 24 kgf |
ACEJ is double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×20 | 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 (double rod, 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 ACEJ20X20-20B Is Used
Small-part press fitting
Presses bearings or dowels into plastic housings on electronics assembly benches, using about 94 N of usable force at 0.5 MPa with the stroke trimmed to the exact insertion depth.
Fixture clamping on CNC jigs
Clamps thin aluminium brackets against CNC jig stops where the short ISO 21287 body fits under the fixture lid that a full-length profile cylinder cannot.
Slide indexing in test stations
Advances a sensor slide 0-20 mm into a test nest, with the male rod thread coupling straight to the slide and speed set between 30-500 mm/s.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X20-20B the Right Cylinder?
Remember the stop screw only shortens the extend stroke; it is not a mid-stroke lock, so the rod will drift if air is lost. If you need position feedback, order the -S variant to enable CMSE / DMSE switches, and match FA flange or LB foot mounts plus I/Y rod knuckles to your fixture.
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 ACEJ20X20-20B FAQ
Push is 157.1 N and pull is 117.8 N at 0.5 MPa; at 0.7 MPa push rises to 219.9 N and pull to 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. It is double acting with a 20 mm stroke adjustable down to 0 mm via the stop screw, runs on air at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s, and ports are 1/8" with a PT supply thread.
The ISO 21287 short body is hard-anodized aluminium with threaded covers, an S45C hard-chrome rod and a fixed TPU bumper at each end, saving about 50% of the mounting length of an ISO 15552 profile cylinder. This unit has no magnet fitted; order the optional -S code to enable CMSE / DMSE switches. Mounting options include FA flange and LB foot, and the male rod thread suits direct tooling attachment.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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