Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 45mm 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
- Stroke45 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 ACEJ12X45-20SB
This ACEJ12X45-20SB is a double acting compact cylinder built to ISO 21287, with a 12 mm bore and a 45 mm stroke that an external stop screw trims by up to 20 mm, giving a usable extend range of 25-45 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N at 0.7 MPa, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The male rod thread (B code) and the fitted -S magnet make it ready for CMSE / DMSE switch sensing straight out of the box.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures where a full-length body cannot. In practice, plan for roughly 34 N of real work at 0.5 MPa (about 0.6 of the push figure), which corresponds to lifting about 3 kg vertically with a 2:1 margin. A hard-anodized aluminium body, S45C hard-chrome rod, fixed TPU bumpers at both ends and a speed range of 30-500 mm/s round out the package.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACEJ12X45-20SB Is Used
Small-part ejection from plastic molds
The trimmed 25-45 mm extend range is ideal for knocking lightweight finished caps or bushings off a mold table, with 56.5 N at 0.5 MPa enough for parts under about 3 kg.
Pick-and-place verification on SMT benches
With the -S magnet fitted, CMSE or DMSE switches confirm extend and retract on a 45 mm stroke, verifying that a feeder or tray is fully seated before the next cycle.
Light hold-down of PCBs during test
About 34 N of usable force at 0.5 MPa presses a circuit board flat against a fixture bed, and the stop screw lets you dial the exact press depth per board type.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-20SB the Right Cylinder?
At 56.5 N push at 0.5 MPa, this 12 mm bore suits light clamping and small-part positioning; step down is not available below 12 mm, while the 16 mm bore delivers 100.5 N at the same pressure if you need nearly double the force. Remember the stop screw only shortens the extend stroke within the 20 mm window and is not a mid-stroke lock - on air loss the piston still drifts, so add a separate holding valve where a load must stay put. FA flange or LB foot mountings bolt to the standard ISO 21287 face, and the fitted -S magnet lets CMSE / DMSE switches report end positions without any retrofit.
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 ACEJ12X45-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa the figures are 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 45 mm extend stroke on site, so the usable range is 25-45 mm. It cannot lengthen the stroke past 45 mm, and the stop is not a load-holding lock - on air loss the piston still drifts. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, and the 6 mm rod carries a male thread.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow jigs, guards and gantries. Air ports are M5x0.8, and FA flange or LB foot mountings bolt to the standard face. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped onto the body slots for end-position sensing; models ordered without -S have no magnet. Fixed TPU bumpers absorb end-of-stroke energy at both ends, and the unit runs on air filtered to 40 um from -20 to +70 C.
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