Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40B
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40B 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 ACEJ12X50-40B
The ACEJ12X50-40B is a double acting ISO 21287 compact cylinder with a 12 mm bore and a 50 mm stroke that an external stop screw trims on site. The -40 code gives a 40 mm adjustment window, so the extend stroke can be set anywhere from 10 to 50 mm without changing the cylinder. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push rises to 79.2 N, with a theoretical maximum 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, so it slots into slim fixtures, small guarding and bench-top tooling. The B code supplies a male M3x0.5 rod thread, and the fixed TPU bumpers at both ends absorb end-of-stroke shock. Note that no magnet is fitted on this version; the optional -S code is required before CMSE or DMSE switches can be used.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40B |
|---|---|
| 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 ACEJ12X50-40B
| 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 ACEJ12X50-40B Is Used
Micro assembly press
The 34 N practical push class at 0.5 MPa is enough to seat small connectors, pins and springs in electronics or watch-grade subassemblies, with the 10-50 mm stroke range matched per fixture.
Small-part diverting on conveyors
Mounted on an LB foot bracket beside a miniature conveyor, the trimmed extend stroke kicks chips, caps or sorted components off the belt without overshooting the lane.
Lab and test fixture actuation
The compact body fits inside bench-top test rigs and inspection jigs where a full-length ISO 15552 profile cylinder cannot, and the male M3x0.5 rod thread suits small tooling adapters.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X50-40B the Right Cylinder?
The stop screw is a mechanical end stop only - on air loss the piston can still drift, so do not rely on it to hold a load mid-stroke. Mount with FA flange or LB foot brackets on the ISO 21287 face, and if position sensing is needed, order the -S variant to enable the optional magnet for 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 ACEJ12X50-40B FAQ
Bore 12 mm, stroke 50 mm with a 40 mm adjustment window (usable extend stroke 10-50 mm). Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push reaches 79.2 N and pull 59.4 N; theoretical maximum force is 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, air filtered to 40 um, temperature -20 to +70 C. Port is M5x0.8 and the rod thread is male M3x0.5 (B code).
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with fixed TPU bumpers at both ends to absorb end-of-stroke impact. FA flange, LB foot and FTC brackets plus I and Y rod knuckles bolt to the standard face. This version has no magnet fitted; order the -S code to enable the optional magnet so CMSE or DMSE reed or solid-state switches can be mounted on the body slots.
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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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