Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø12mm bore and 45mm 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
- Stroke45 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 ACEJ12X45-40B
This double acting AirTAC ACEJ12X45-40B is an ISO 21287 compact cylinder with a 12 mm bore and a 45 mm stroke that an external stop screw can trim anywhere in a 40 mm window, giving a usable extend range of 5-45 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those figures rise to 79.2 N and 59.4 N, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. The hard-anodized aluminium body is about 50% shorter in mounting length than an ISO 15552 profile cylinder, so it slots into tight fixtures a full-length body cannot reach.
Practically, plan for roughly 34 N of real work at 0.5 MPa (about 60% of the push rating), which corresponds to lifting around 1.7 kg vertically - or about 0.9 kg if you keep a 2:1 margin. The rod is 6 mm with a MALE thread (the B code), and the port is M5x0.8. A fixed TPU bumper at each end absorbs end-of-stroke impact, and the stop screw is a mechanical end stop only: on air loss the piston still drifts, so it never holds a load. Note there is no magnet fitted - order the -S variant if you need CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-40B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACEJ12X45-40B Is Used
Micro switch assembly press
The 56.5 N push at 0.5 MPa is enough to seat small tact switches and terminals into PCB housings, and the 5-45 mm adjustable range lets one cylinder serve several board heights.
Vial and ampoule rejection pusher
On pharma packaging lines, the 45 mm stroke with a 40 mm trim window ejects off-spec vials from a conveyor lane, and the compact body fits inside tight guard panels.
Semiconductor fixture lid latch
A 6 mm male-thread rod with a small hook lifts about 1.7 kg vertically at 0.5 MPa, ideal for latching inspection fixture lids where space is at a premium.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40B the Right Cylinder?
At this bore size the 56.5 N push at 0.5 MPa suits light clamping, indexing and small-part ejection; if your load needs more, the 16 mm bore delivers 100.5 N and the 20 mm bore 157.1 N at the same pressure, while the 12 mm stays the lightest option. Check that your duty is extend-side trimming only - the -40 window shortens the 45 mm stroke down to 5 mm but never extends past it, and it is not a mid-stroke lock. Mount with FA flange or LB foot on the ISO 21287 face, choose female or male (B) rod thread to suit your tooling, and add the -S magnet code only if CMSE / DMSE position switches are actually needed.
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 ACEJ12X45-40B FAQ
Bore 12 mm, stroke 45 mm, adjustable extend stroke in a 40 mm window (usable 5-45 mm). Push 56.5 N and pull 42.4 N at 0.5 MPa; push 79.2 N and pull 59.4 N at 0.7 MPa; theoretical maximum 11.5 kgf at 1.0 MPa. Operating pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um. Port is M5x0.8, rod is 6 mm with male thread (B code), and the body is hard-anodized aluminium with an S45C hard-chrome rod.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it fits crowded jigs and gantries. A fixed TPU bumper at each end absorbs end-of-stroke impact. Mounting options include FA flange and LB foot plus I/Y rod knuckles on the standard ISO 21287 face. Position sensing requires the optional -S magnet code - this model (no S) has no magnet, so CMSE / DMSE switches cannot be mounted unless you order the -S version.
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