Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30B is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 ACEJ20X40-30B
A double acting AirTAC compact cylinder to ISO 21287, the ACEJ20X40-30B pairs a 20 mm bore with a 40 mm stroke and an external stop screw that trims the extend stroke anywhere in a 30 mm window, giving a usable range of 10-40 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa, with a theoretical ceiling of 32 kgf at 1.0 MPa. The male rod thread (B code) bolts straight to tooling without an adapter nut.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarded cells. A rule of thumb: keep real work near 94 N (about 9.6 kgf) at 0.5 MPa, which corresponds to lifting roughly 8 kg vertically with a 2:1 margin. Fixed TPU bumpers absorb end-of-stroke shock, speed runs 30-500 mm/s, and the optional -S magnet enables CMSE / DMSE switches - without -S no magnet is fitted.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30B |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 40 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 ACEJ20X40-30B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -30 | 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 ACEJ20X40-30B Is Used
Small electronics press fit
Pressing connectors into PCB housings needs roughly 90-150 N of controlled force; the 10-40 mm trim range lets one cylinder serve several housing heights on the same jig.
Vial and vial-tray transfer
Pushing trays of 10-30 ml vials off a conveyor lane at 30-500 mm/s suits the 157.1 N push at 0.5 MPa, with the short body fitting under low guard rails.
Pick station with end-position check
With the -S magnet ordered, CMSE or DMSE switches confirm the trimmed extend position on a pick-and-place slide handling parts up to about 8 kg vertical equivalent.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30B the Right Cylinder?
Size between neighbours: the 16 mm bore delivers 100.5 N push at 0.5 MPa while the 25 mm bore reaches 245.4 N, so this 20 mm unit at 157.1 N sits squarely in the light-clamping and small-part-transfer band. If your load needs holding against air loss, add an external brake - the stop screw only sets the extend stroke end position and cannot lock the piston mid-stroke. Mount on the ISO 21287 face with FA flange or LB foot brackets plus I/Y rod knuckles, and order the -S code if CMSE / DMSE position sensing is planned.
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 ACEJ20X40-30B 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. The base stroke is 40 mm and the stop screw shortens the extend stroke by up to 30 mm, so any setting from 10 to 40 mm is available. 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 10 mm with male thread.
The ISO 21287 compact body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium barrel, S45C hard-chrome rod and fixed TPU bumpers at both ends. Position sensing requires the optional -S magnet code - without it no magnet is fitted and no switch can be read. With -S, CMSE and DMSE switches mount in the body slots.
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