Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10B 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 ACEJ20X40-10B
The ACEJ20X40-10B is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore and a 40 mm stroke that an external stop screw trims by up to 10 mm, giving a usable extend range of 30-40 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N and 164.9 N, with a theoretical 32 kgf at 1.0 MPa. The hard-anodized aluminium body carries a male-threaded S45C hard-chrome rod (the B code) and fixed TPU bumpers at both ends.
Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight fixtures, guards and pick stations where a full-length body will not fit. Plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. The magnet is not fitted on this version; order the -S code if you later need CMSE or DMSE switch position feedback.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10B |
|---|---|
| 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 ACEJ20X40-10B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -10 | 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 ACEJ20X40-10B Is Used
Small-part press fitting
Seating dowel pins or bearings into aluminium housings on an electronics assembly bench, where the 157.1 N push at 0.5 MPa is enough and the 30-40 mm trim dials in the exact seating depth.
Fixture clamping in tight jigs
Clamping thin-walled plastic or sheet-metal parts in a machining jig whose guard leaves no room for a full-length body - the short ISO 21287 frame fits where longer cylinders cannot.
Light pick-and-place lift
Raising connectors or sensor bodies weighing up to about 8 kg vertically from a conveyor tray into a test nest, with the male rod thread (B) taking a standard knuckle.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-10B the Right Cylinder?
Size against neighbours: the 16 mm bore gives 100.5 N push at 0.5 MPa, while the 25 mm bore reaches 245.4 N, so this 20 mm unit sits in the middle for light clamping and small part transfer. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock - on air loss the piston still drifts. FA flange or LB foot mounts bolt to the ISO 21287 face; PT ports are standard and a G-thread version can be ordered.
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 ACEJ20X40-10B 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 runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), from -20 to +70 C, at 30-500 mm/s. The 40 mm stroke is trimmed by the stop screw within the 10 mm window (30-40 mm usable).
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, S45C hard-chrome-plated male-thread rod, threaded aluminium covers and fixed TPU bumpers at both ends - about 50% shorter in mounting length than an ISO 15552 profile cylinder. This version has no magnet; order the -S code to enable CMSE or DMSE switches. FA flange and LB foot mounts fit the standard ISO 21287 face.
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