Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 25mm 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.
- BoreØ12 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM3×0.5
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB
The ACEJ12X25-20SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa (rising to 79.2 N at 0.7 MPa), and the -20 code gives a 20 mm adjustment window, so the external stop screw trims the 25 mm stroke anywhere down to 5 mm on site. The hard-anodized aluminium body with an S45C hard-chrome plated 6 mm rod runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s.
This short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures, small gantries and guarded stations where a full-length body will not fit. Because the magnet is ordered as the -S option and this model carries it, CMSE or DMSE reed and solid-state switches mount directly in the body slots. In practice, plan for roughly 34 N (about 3.4 kgf) of real work at 0.5 MPa, and expect it to lift about 2.8 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 25 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| 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 50 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 (Ø12mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 57 N | 42 N |
| 0.7 MPa | 79 N | 59 N |
| Max (@1.0 MPa) | 12 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 ACEJ12X25-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | 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 (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 ACEJ12X25-20SB Is Used
Small-part ejection on assembly benches
With 56.5 N push at 0.5 MPa and a stroke trimmed from 25 mm down to 5 mm, the cylinder kicks finished connectors or pins out of a nest without disturbing adjacent fixtures.
Position-confirmed clamping of electronics housings
The fitted -S magnet drives CMSE or DMSE switches, so a PLC confirms the clamp has reached the adjusted stop before a solder or test cycle starts.
Sample pusher in compact lab automation
The short body, about 50% of the mounting length of an ISO 15552 profile cylinder, fits inside a benchtop analyzer frame to advance microplates or vials one station at a time.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB the Right Cylinder?
At this bore size the choice is between micro force classes: the ACEJ12 gives 56.5 N push at 0.5 MPa, while stepping up to the ACEJ16 raises that to 100.5 N and the ACEJ20 to 157.1 N. If your part weight exceeds about 3.4 kgf of working load, move up a bore. The male (B) rod thread suits inline tooling, and FA flange or LB foot mounts bolt to the ISO 21287 face. Note that the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock: on air loss the piston can still drift, so add a separate holding valve where a load must stay put. The fitted -S magnet lets you add CMSE / DMSE switches for end-of-stroke 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 ACEJ12X25-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those rise to 79.2 N and 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The bore is 12 mm with a 6 mm rod, the ordered stroke is 25 mm, and the -20 adjustment window lets the stop screw shorten the extend stroke to any length from 5 mm to 25 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, threaded aluminium covers, a fixed TPU bumper at both ends and an S45C hard-chrome rod, saving about 50% of the mounting length of an ISO 15552 profile cylinder. Air ports are M5x0.8 and the male rod thread suits inline tooling. Position sensing needs the optional -S magnet, which this model carries: order CMSE or DMSE switches separately and mount them in the body slots. FA flange and LB foot mounts attach to the standard ISO 21287 face.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X25-20SB
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.