Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40S 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 ACEJ12X45-40S
Double acting and stroke-trimmable, the ACEJ12X45-40S is an ISO 21287 compact cylinder with a 12 mm bore and a 45 mm stroke. An external stop screw shortens the extend stroke by up to 40 mm, giving a usable range of 5-45 mm without changing the cylinder. 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 maximum of 11.5 kgf at 1.0 MPa.
The hard-anodized aluminium body and hard-chrome-plated S45C rod keep the short build light yet durable, and the body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slips into tight jigs and guarding. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped straight into the body slots for end-of-stroke signalling. A practical sizing note: plan on roughly 34 N of real work at 0.5 MPa, and expect about 2.9 kg of vertical lift with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40S |
|---|---|
| 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 ACEJ12X45-40S
| 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 ACEJ12X45-40S Is Used
Small-part ejection in plastic moulding
The 5-45 mm trim range suits knocking lightweight finished parts off a mould or nest, with 56.5 N of push at 0.5 MPa enough for grams-scale components.
Position confirmation on assembly benches
With the -S magnet fitted, CMSE or DMSE switches report rod position, so a bench-top fixture can verify a 5-45 mm press or present stroke before the next cycle.
Light hold-down in electronics testing
About 2.9 kg of vertical lift with a 2:1 margin makes this bore a fit for clamping PCBs or small housings under a test probe, where the short body fits inside the fixture frame.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ12X45-40S the Right Cylinder?
For light clamping and positioning, this 12 mm bore delivers 56.5 N push at 0.5 MPa. Step down only if you need under 40 N - there is no smaller ACEJ bore - or step up to the 16 mm bore (100.5 N push at 0.5 MPa) when the load grows. The 40 mm window lets one cylinder serve several stroke points between 5 and 45 mm. Remember the stop screw trims the extend stroke only; it is a mechanical end stop, not a mid-stroke lock, so the rod will drift if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and 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 ACEJ12X45-40S FAQ
Bore 12 mm, stroke 45 mm, adjustable down to 5 mm via the 40 mm stop-screw window. Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push is 79.2 N and pull 59.4 N; theoretical maximum 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, port M5x0.8, rod thread M3x0.5 female.
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. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches clamp into the body slots; FA flange and LB foot mounts bolt to the standard ISO 21287 face.
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