Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ12X40-40SB is a genuine double acting, double rod, 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, double rod, adjustable stroke
- Rod threadM3×0.5
- 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 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. 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, double rod, 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 42 N |
| 0.7 MPa | 59 N |
| Max (@1.0 MPa) | 9 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 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 (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 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?
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
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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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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