Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB is a genuine double acting, double rod, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 50mm 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
- Stroke50 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 ACEJ12X50-40SB
The ACEJ12X50-40SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, and the short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body cannot.
The -40 code is a 40 mm adjustment window: an external stop screw trims the 50 mm extend stroke on site, giving a usable range of 10-50 mm without swapping the cylinder. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted for end-of-stroke signalling, and fixed TPU bumpers at both ends absorb end-of-stroke shock.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 50 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 ACEJ12X50-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 ACEJ12X50-40SB Is Used
Small-part presence check
A 12 mm bore probing tiny electronic components on an assembly fixture gets 56.5 N at 0.5 MPa, and the fitted magnet drives a CMSE switch to confirm the trimmed stroke was reached.
Multi-length ejection station
One ejector serving 10-50 mm product variants: the stop screw is re-set per changeover instead of re-piping, with the 40 mm window covering the whole family.
Compact jig clamping
Inside a cramped drill jig head, the short body that saves about 50% of an ISO 15552 profile cylinder's mounting length delivers about 34 N of practical clamp force at 0.5 MPa.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40SB the Right Cylinder?
At this bore size the neighbours matter: a 16 mm bore pushes 100.5 N at 0.5 MPa if your load creeps up, while stepping down is not possible since 12 mm is the smallest ACEJ bore. The -40 window suits stations where one cylinder must serve several product lengths; remember the stop screw only shortens the extend stroke and drifts on air loss, so it is not a load-holding lock. With the -S magnet fitted, add CMSE or DMSE switches; FA flange or LB foot mounts bolt straight to the ISO 21287 face.
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 ACEJ12X50-40SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push is 79.2 N and pull 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke (40 mm window on a 50 mm stroke, so 10-50 mm usable), runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s, port M5x0.8, 6 mm rod with male thread, and fixed TPU bumpers both ends.
An external stop screw shortens the extend stroke by up to 40 mm within the ordered -40 window; it cannot lengthen the stroke past 50 mm, and it acts as an end stop only, so the piston still drifts if air is lost. Because this model carries the optional -S magnet, CMSE / DMSE reed or solid-state switches mount directly on the body slots for end-of-stroke detection.
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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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