Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40SB 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 ACEJ20X45-40SB
Double acting and stroke-trimmable, the ACEJ20X45-40SB is an AirTAC ISO 21287 compact cylinder with a 20 mm bore and 45 mm stroke. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. The -40 code means an external stop screw lets you shorten the extend stroke anywhere in a 40 mm window, so the usable range is 5-45 mm - set it once with a screwdriver, no disassembly.
The short hard-anodized aluminium body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding. This -S model carries the optional magnet, so CMSE / DMSE reed or solid-state switches can be clamped straight onto the body for end-of-stroke signals. With 157.1 N of push, plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the male rod thread (B code) suits tooling that threads on directly.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40SB |
|---|---|
| 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 ACEJ20X45-40SB
| 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 ACEJ20X45-40SB Is Used
Fixture clamp with tuned stroke
On a small CNC jig, the stop screw trims the 45 mm stroke down to clamp thin sheet without over-compressing, while the CMSE switch confirms the clamp is made.
Packaging line push-off
Kicks cartons or blisters off a narrow conveyor lane; the 8 kg vertical-lift margin covers product weight with room to spare at 0.5 MPa.
Lab dosing head actuator
The 5-45 mm adjustable range positions a small dosing or sampling head precisely, with the male rod thread accepting the tooling directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40SB the Right Cylinder?
At 157.1 N push at 0.5 MPa this 20 mm bore sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N). If your part weight and friction stay under about 94 N of working force, stay here; step up to bore 25 for heavier clamping or down to 16 for tighter spaces. The stop screw is a mechanical end stop only - on air loss the rod drifts, so add a separate valve or lock if you must hold a load mid-stroke. FA flange or LB foot mount on the ISO 21287 face, and the male rod thread takes I or Y knuckles directly. Runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 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 ACEJ20X45-40SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa, 219.9 N push and 164.9 N pull; theoretical maximum is 32 kgf at 1.0 MPa. The -40 code gives a 40 mm adjustment window: an external stop screw shortens the 45 mm extend stroke by up to 40 mm, so you can run anywhere from 5 to 45 mm. It is double acting, runs at 30-500 mm/s, and the stop is an end stop, not a mid-stroke lock.
It is an ISO 21287 compact cylinder whose body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. This -S version carries the optional magnet, so CMSE / DMSE switches mount on the body slots. FA flange, LB foot, FTC brackets and I/Y rod knuckles bolt to the standard face; the air port is M5x0.8 and the rod end is male thread.
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