Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20S 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 ACEJ20X70-20S
The ACEJ20X70-20S is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 70 mm stroke by up to 20 mm, giving a usable range of 50-70 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, and the -S code means the magnet is already fitted, so CMSE / DMSE reed or solid-state switches can be clamped straight into the body slots for end-of-stroke sensing.
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 an S45C hard-chrome rod, a fixed TPU bumper sits at each end, and speed runs 30-500 mm/s. For sizing, treat roughly 94 N (about 0.6 of the push force) as the practical working force at 0.5 MPa, which corresponds to lifting around 9 kg vertically - halve that to about 4-5 kg if you want a 2:1 margin on a vertical lift.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20S |
|---|---|
| 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 ACEJ20X70-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -20 | 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 ACEJ20X70-20S Is Used
Fixture clamping on CNC jigs
The 50-70 mm adjustable window lets a machinist dial the clamp stroke to the fixture without shimming, and the 157.1 N push at 0.5 MPa holds light aluminium parts during drilling.
Small-part diverting on packaging lines
With the fitted magnet and a CMSE switch, the PLC confirms each 70 mm push that nudges cartons or blisters off a conveyor, at line speeds within the 30-500 mm/s range.
Sample press in lab automation
The compact body fits inside benchtop analyzer frames, and the M6x1.0 female rod thread accepts a custom press pad for sealing microplates or vials.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20S the Right Cylinder?
At 20 mm bore this sits in the light-to-medium class: if your load needs more than about 157 N at 0.5 MPa, step up to the 25 mm bore (245.4 N push at 0.5 MPa); if 100 N from a 16 mm bore is enough, the smaller frame saves more space. Remember the stop screw only shortens the extend stroke within the 20 mm window - it is a mechanical end stop, not a mid-stroke lock, so the rod will still drift if air is lost. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet lets you add CMSE / DMSE switches without reordering.
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 ACEJ20X70-20S FAQ
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 maximum of 32 kgf at 1.0 MPa. The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 70 mm extend stroke by up to 20 mm, so the working range is 50-70 mm. It shortens the stroke only - it never extends past 70 mm and does not hold a load if air pressure drops.
It is an ISO 21287 compact cylinder whose short 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. Because this model carries the -S magnet, CMSE / DMSE reed or solid-state switches mount in the body slots for position feedback. FA flange and LB foot brackets bolt to the standard ISO 21287 face, and the air port is M5x0.8.
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