Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB 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 ACEJ12X40-40SB
This is a double acting AirTAC ACEJ compact cylinder built to ISO 21287, with a 12 mm bore, a 40 mm stroke and a male-threaded rod end. An external stop screw trims the extend stroke anywhere within the ordered 40 mm window, so one cylinder covers a 0-40 mm working range without changing hardware. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N on the extend stroke at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into slim fixtures a full-length body cannot reach.
The hard-anodized aluminium body carries a hard-chrome plated S45C rod, and a fixed TPU bumper at each end absorbs end-of-stroke energy. Because the S code is ordered, the magnet is fitted, so CMSE or DMSE reed and solid-state switches can be clipped into the body slots for end-of-stroke sensing. Plan on roughly 34 N (about 0.6 of the push rating) for real work at 0.5 MPa, which is about 3.4 kg of horizontal load; vertically it lifts around 5.7 kg, or about 2.9 kg with a 2:1 margin. Running speed is 30-500 mm/s across 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB |
|---|---|
| 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 ACEJ12X40-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -40 | 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 ACEJ12X40-40SB Is Used
Micro part ejection from a pick-and-place nest
A 0-40 mm trimmed extend stroke nudges small electronics or machined parts off a nest; 56.5 N at 0.5 MPa is ample for parts under 3 kg, and the fitted magnet confirms ejection via a CMSE switch.
Presence check on a compact assembly fixture
The male rod thread takes a Y knuckle to probe whether a connector or bracket is seated; the -S magnet drives a DMSE switch to signal the checked position back to the PLC.
Small-batch carton tab folding on a benchtop line
The stop screw is set once to fold tabs at a repeatable 25 mm travel, then re-trimmed for a different carton size within the same 40 mm window - no cylinder swap needed.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB the Right Cylinder?
At 56.5 N push at 0.5 MPa, this 12 mm bore suits light clamping, sorting and small-part ejection. If your load needs more, the 16 mm bore delivers 100.5 N at the same pressure; if it needs less travel force, this is the smallest ACEJ bore available. The 40 mm adjustment window means the stop screw shortens the extend stroke on site - it cannot lengthen travel past 40 mm, and it is a mechanical end stop only, so the rod will drift if air is lost. FA flange or LB foot mounts and I/Y rod knuckles bolt to the ISO 21287 face; the fitted -S magnet accepts CMSE / DMSE switches.
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 ACEJ12X40-40SB 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 -40 code is a 40 mm adjustment window: the external stop screw shortens the 40 mm extend stroke to any setting from 0 to 40 mm. It is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air pressure is lost.
This model carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches mount directly in the body slots for end-position detection. The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at both ends, an M5x0.8 port, FA flange or LB foot mounting, and operation from 0.15-1.0 MPa (22-145 psi) at 30-500 mm/s.
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