Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke45 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B
The ACEJ20X45-40B is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 45 mm stroke by up to 40 mm, giving a usable range of 5-45 mm without changing hardware. At 0.5 MPa the 20 mm bore pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into shallow fixtures, slide brackets and guarding where a full-length body simply will not fit.
For sizing, plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which is enough to lift about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a hard-chrome plated S45C rod, and the male rod thread (the B code) bolts straight to your tooling. Note that the stop screw is a mechanical end stop, not a mid-stroke lock - on air loss the piston still drifts. The optional -S magnet enables CMSE / DMSE switches; this model without the S code carries no magnet.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 45 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| 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 100 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | 165 N |
| Max (@1.0 MPa) | 32 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 ACEJ20X45-40B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | 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 ACEJ20X45-40B Is Used
Small-parts press fitting
A 157.1 N push at 0.5 MPa (219.9 N at 0.7 MPa) presses bearings, bushings and dowel pins into electronics or watch-component housings, with the stop screw set per part variant.
Multi-variant jig clamping
On an assembly bench that handles several product heights, the 5-45 mm adjustable range lets one cylinder clamp short and tall workpieces without swapping hardware.
Light part ejection from chutes
Pushes small machined or molded parts off a nest into a bin at up to 500 mm/s; the fixed TPU bumper at both ends absorbs the end-of-stroke shock quietly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40B the Right Cylinder?
At 157.1 N push (0.5 MPa) this 20 mm bore suits light clamping and positioning; step down to a 16 mm bore (100.5 N) for lighter loads or up to a 25 mm bore (245.4 N) when you need more margin. The 40 mm window means you can dial the extend stroke anywhere from 5 to 45 mm on site, so one cylinder can serve several jig variants. Choose the B male rod thread for direct attachment to custom tooling, add FA flange or LB foot mounting to match your fixture, and order the -S code if you will need CMSE / DMSE position switches later. Speed range is 30-500 mm/s.
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 ACEJ20X45-40B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke (40 mm window on a 45 mm stroke, usable 5-45 mm), 20 mm bore, 10 mm rod with male thread, M5x0.8 port, operating pressure 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um.
An external stop screw shortens the extend stroke on site by up to 40 mm, so the effective stroke runs from 5 to 45 mm; it is a mechanical end stop only and will not hold a load if air is lost. Sensing requires the optional -S magnet, which allows CMSE / DMSE switches to ride the body's magnet slots; this model, ordered without the S code, has no magnet fitted. The short ISO 21287 body takes about 50% less mounting length than an ISO 15552 profile cylinder, and FA flange or LB foot brackets bolt straight to the standard face.
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