Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20B 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 ACEJ20X45-20B
A double acting ISO 21287 compact cylinder, the ACEJ20X45-20B pairs a 20 mm bore with a 45 mm stroke and a male-threaded 10 mm rod (the B code). An external stop screw trims the extend stroke anywhere in the ordered 20 mm window, so the working range is 25-45 mm, set on site without disassembly. At 0.5 MPa it pushes 157.1 N, which means you can plan on roughly 94 N of real work and lift about 8 kg vertically with a 2:1 margin.
The hard-anodized aluminium body with an S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding. A fixed TPU bumper sits at both ends, speed runs 30-500 mm/s, and the optional -S magnet enables CMSE / DMSE switches if position feedback is added later.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20B |
|---|---|
| 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 ACEJ20X45-20B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | Stroke length in mm. |
| -20 | 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 ACEJ20X45-20B Is Used
Small-part ejection from jigs
The 25-45 mm adjustable extend stroke lets a fixture builder trim the push-off travel of a 157.1 N ram to exactly where a machined bracket clears the nest.
Benchtop test station actuator
A lab press cycling small sample trays at 30-500 mm/s uses the stop screw to shorten travel per test recipe, with the male rod thread taking a custom probe tip.
Carton flap tuck on a packing line
With about 8 kg of vertical-lift margin at 0.5 MPa, the cylinder folds lightweight flaps inside a tight guard where a full-length profile cylinder will not fit.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20B the Right Cylinder?
Size check: a 16 mm bore gives 100.5 N push at 0.5 MPa, while stepping up to 25 mm raises it to 245.4 N - pick the 20 mm when your load sits between those. Remember the stop screw is a mechanical end stop only; on air loss the rod still drifts, so it is not a mid-stroke lock. FA flange or LB foot mount on the ISO 21287 face, and order the -S code if you need the magnet for CMSE / DMSE sensing.
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 ACEJ20X45-20B 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, with a theoretical maximum of 32 kgf at 1.0 MPa. The -20 code is a 20 mm adjustment window: an external stop screw shortens the 45 mm extend stroke by up to 20 mm, giving a usable 25-45 mm range. It is double acting, runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), and the M5x0.8 port follows the 20 mm bore.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at each end absorbing end-of-stroke energy. FA flange and LB foot brackets bolt straight to the standard face, and the B code gives a male rod thread. Position sensing requires the optional -S magnet ordered with the cylinder; without it no CMSE or DMSE switch can be mounted.
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