Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40S 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 ACEJ20X70-40S
The ACEJ20X70-40S is a double acting ISO 21287 compact cylinder with a 20 mm bore and 70 mm stroke, and its -40 code adds a 40 mm adjustment window: an external stop screw trims the extend stroke on site anywhere between 30 and 70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. 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 cannot fit.
This model carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches can be clipped into the body slots for end-of-stroke signalling. The hard-anodized aluminium body pairs with an S45C hard-chrome-plated 10 mm rod, a fixed TPU bumper absorbs end-of-stroke shock at each end, and the female M6x1.0 rod thread plus FA flange or LB foot mounting drops straight into standard fixtures. Running 30-500 mm/s on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, it delivers a theoretical 32 kgf at 1.0 MPa.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40S |
|---|---|
| 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 ACEJ20X70-40S
| 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 ACEJ20X70-40S Is Used
Fixture clamping on CNC pallets
The 30-70 mm adjustable window lets one cylinder serve several pallet fixtures: set the stop screw to the clamp height of each pallet, with 157.1 N of push at 0.5 MPa holding light aluminium parts.
Eject with position feedback
With the -S magnet fitted, CMSE switches confirm the extend and retract ends of a 70 mm eject stroke on a small-parts sorting chute, while the TPU bumper quiets each cycle.
Press-fit of connector pins
A bench-top pin-press uses the 219.9 N push at 0.7 MPa to seat connectors, and the trimmed stroke range prevents over-travel past the die shoulder.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40S the Right Cylinder?
Size this bore by load: at 0.5 MPa the 20 mm bore gives 157.1 N of push, so plan on roughly 94 N (about 9.6 kg) of real work with a 1.6x margin. If your load needs more, step up to the 25 mm bore with 245.4 N push at 0.5 MPa; if less, the 16 mm bore with 100.5 N keeps the envelope smaller. Note the stop screw only shortens the extend stroke - it is a mechanical end stop, not a mid-stroke lock, so the piston still drifts if air is lost. Choose the -S magnet (fitted here) when CMSE / DMSE position sensing is needed, and match FA flange or LB foot mounting to your fixture face.
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 ACEJ20X70-40S 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, female M6x1.0 rod thread, operating pressure 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 a 40 mm adjustment window giving a 30-70 mm usable extend stroke.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it fits shallow jigs and gantries. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches can be mounted in the body slots; FA flange and LB foot brackets bolt to the standard mounting face.
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