Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X25-20B
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ20X25-20B is a genuine double acting, double rod, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 25mm 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
- Stroke25 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 ACEJ20X25-20B
The ACEJ20X25-20B is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 25 mm stroke by up to 20 mm on site, giving a usable range of 5-25 mm without changing the cylinder. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, and the male rod thread (the B code) bolts straight 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 tight fixtures and guarded cells.
The hard-anodized aluminium body carries a 10 mm S45C hard-chrome rod, a fixed TPU bumper absorbs end-of-stroke shock at both ends, and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). Note there is no magnet fitted on this version; the optional -S code adds one for CMSE / DMSE switches.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X25-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X25-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 25 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 ACEJ20X25-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×25 | 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 ACEJ20X25-20B Is Used
Fixture clamping on CNC jigs
Male rod thread plus FA flange makes the 20 mm bore a direct clamp for aluminum machining fixtures, where the compact body fits between jaws and guard walls.
Packaging line reject pushers
At 30-500 mm/s the cylinder kicks off-spec cartons or blisters off a conveyor track, and the short body mounts where a full-length profile cylinder cannot.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X25-20B the Right Cylinder?
Remember the stop screw is a mechanical end stop only - on air loss the piston drifts, so it is not a mid-stroke lock or load-holding brake. Mount with FA flange or LB foot on the ISO 21287 face, and if you need position feedback order the -S magnet variant instead of this code.
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 ACEJ20X25-20B FAQ
The -20 code sets a 20 mm adjustment window: the external stop screw shortens the 25 mm extend stroke anywhere down to 5 mm. It runs double acting on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, at 30-500 mm/s, with a fixed TPU bumper at both ends.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA flange, LB foot, FTC brackets and I/Y rod knuckles available. This standard code has no magnet, so no switch can be read; order the optional -S magnet version to enable CMSE / DMSE reed or solid-state switches. Port is 1/8" and the rod end is male thread (B code).
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Standard models are processed and dispatched in 3-5 business days.
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