Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40 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 ACEJ20X40-40
The ACEJ20X40-40 is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: a stop screw on the outside of the body trims the 40 mm stroke down to any length within the ordered 40 mm window, so one unit covers a whole family of stroke settings on the line. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa. In practice that means roughly 94 N of usable work force at 0.5 MPa, and a vertical lift of about 8 kg with a 2:1 margin - enough to index small fixtures or lift light plastic parts.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit. A hard-anodized aluminium barrel carries a hard-chrome plated S45C rod, and a fixed TPU bumper at each end absorbs end-of-stroke impact. Note that this model has no magnet fitted - order the -S code if you need CMSE / DMSE switch position sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40 |
|---|---|
| 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 ACEJ20X40-40
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACEJ20X40-40 Is Used
Adjustable clamp fixtures
The 0-40 mm trim range lets a machining fixture take different part heights without swapping cylinders - just wind the stop screw to the new extend position.
Small parts ejection
With 157.1 N push at 0.5 MPa and about 8 kg of safe vertical lift, the 20 mm bore ejects light stamped or moulded parts from a nest at up to 500 mm/s.
Compact pick stations
The body is about 50% shorter than an ISO 15552 profile cylinder, so it fits inside tight gantry Z-axes and guarded test stations where space is the constraint.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40 the Right Cylinder?
Size against the load: the next bore down, ACEJ16, gives 100.5 N push at 0.5 MPa, while stepping up to ACEJ25 raises it to 245.4 N - choose the 20 mm bore when your clamp or lift sits between roughly 90 and 150 N of real work. Remember the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock: on air loss the piston still drifts, so do not rely on it to hold a load. FA flange or LB foot mounts bolt straight to the ISO 21287 face, and the optional -S magnet enables CMSE / DMSE switches if you later need end-position 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 ACEJ20X40-40 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. It is double acting with an extend stroke adjustable from 0 to 40 mm via the external stop screw, running on air filtered to 40 um at 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, with a female M6x1.0 rod thread and M5x0.8 ports.
The -40 code is a 40 mm adjustment window: an external stop screw shortens the 40 mm extend stroke to any setting within that range, and a fixed TPU bumper at each end absorbs the end-of-stroke impact. Position sensing is not fitted on this model - the magnet is the optional -S code, so order ACEJ20X40-40S if you want CMSE or DMSE switches to detect end positions.
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