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, 1/8" 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 size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
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 | 1/8" |
| 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 1/8".
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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