Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 40mm 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
- Stroke40 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 ACEJ12X40-20B
The ACEJ12X40-20B 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 push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. The B code gives a male rod thread on the 6 mm rod, and the port is M5x0.8. An external stop screw trims the 40 mm stroke by up to 20 mm on site, so the usable extend range is 20-40 mm.
The hard-anodized aluminium body with an S45C hard-chrome rod resists wear, and a fixed TPU bumper at each end absorbs end-of-stroke energy. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarding. As a rule of thumb, plan for roughly 34 N (about 3.4 kgf) of real work at 0.5 MPa, enough to lift about 2.9 kg vertically with a 2:1 margin. Note the magnet is not fitted here: order the optional -S code to enable CMSE / DMSE switches.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 40 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 ACEJ12X40-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 ACEJ12X40-20B Is Used
Small-part ejection from micro molds
The 56.5 N push at 0.5 MPa clears finished clips or bushings from shallow cavities, and the 20-40 mm trim range lets one cylinder serve several mold depths.
Compact pick station on a PCB line
The short body fits inside tight SMT gantry frames, and with the optional -S magnet, CMSE or DMSE switches confirm extend and retract on the 40 mm stroke.
Lab fixture clamping of small housings
About 34 N of practical holding force at 0.5 MPa secures lightweight sensor housings during a manual screwdriving or glue-dispense step.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-20B the Right Cylinder?
At this bore size, compare the ACEJ12X40-20B against the ACEJ16X40-20B, which pushes 100.5 N at 0.5 MPa, or step down if 56.5 N covers the job. The stop screw is a mechanical end stop for the extend stroke only: on air loss the piston still drifts, so do not rely on it to hold a load mid-stroke. FA flange or LB foot mounts bolt to the ISO 21287 face, and the male rod thread suits external knuckle joints. If position feedback is needed later, specify the -S magnet option when ordering.
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 ACEJ12X40-20B FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push reaches 79.2 N, and the theoretical maximum is 11.5 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke (20 mm window, usable 20-40 mm), runs on air filtered to 40 um at 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, with an M5x0.8 port and male rod thread on the 6 mm rod.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits narrow jigs and machine guards. FA flange and LB foot brackets bolt straight to the standard face. This version has no magnet fitted; order the optional -S code to enable CMSE / DMSE reed or solid-state switches. A fixed TPU bumper at both ends absorbs end-of-stroke energy.
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