Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 70mm 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
- Stroke70 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 ACEJ20X70-40
The ACEJ20X70-40 is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 70 mm stroke that an external stop screw trims on site: the -40 code gives a 40 mm window, so the usable extend range is 30-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs and guarded stations where a full-length body will not fit.
In practice, plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which lifts about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries a S45C hard-chrome plated 10 mm rod, a fixed TPU bumper sits at both ends, and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). No magnet is fitted on this version; order the optional -S code if you later need CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 70 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 ACEJ20X70-40
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 ACEJ20X70-40 Is Used
Fixture clamping on small CNC pallets
The 30-70 mm adjustable window lets one cylinder serve several pallet heights, and 157.1 N push at 0.5 MPa holds light aluminium parts through drilling cycles.
Pick-and-place ejection in compact gantries
With the short body saving about 50% of the mounting length of an ISO 15552 profile cylinder, it ejects connectors from nests inside tight guarding; add the -S magnet for CMSE / DMSE switches.
Sample press in laboratory dosing stations
About 8 kg of vertical lift with a 2:1 margin seats vials or microplates gently, and the fixed TPU bumper quiets each end of the 70 mm stroke.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40 the Right Cylinder?
Size against neighbours: the 16 mm bore delivers 100.5 N push at 0.5 MPa, while the 25 mm bore reaches 245.4 N, so pick the ACEJ20X70-40 when your load sits between those classes and the 30-70 mm adjustable range covers your part tolerance. Remember the stop screw is a mechanical end stop, not a mid-stroke lock - on air loss the piston still drifts. FA flange, LB foot and FTC brackets plus I/Y rod knuckles bolt to the ISO 21287 face, and the female M6x1.0 rod thread suits standard tooling plates.
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 ACEJ20X70-40 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 bore is 20 mm with a 10 mm rod, M5x0.8 ports, PT body threads and a female M6x1.0 rod thread. Operating pressure is 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, and the extend stroke adjusts between 30 and 70 mm via the stop screw.
An external stop screw shortens the extend stroke on site by up to 40 mm within the ordered window, giving 30-70 mm of usable travel; it cannot lengthen the stroke past 70 mm. It acts as an end stop only, so the piston still drifts if air is lost. Sensing requires the optional -S magnet, which enables CMSE / DMSE reed or solid-state switches on the body's magnet slots; this model without the S code carries no magnet. The fixed TPU bumper at both ends simply decelerates the piston.
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