Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30B 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 ACEJ20X70-30B
The ACEJ20X70-30B 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 30 mm, giving a usable range of 40-70 mm without changing the order code. At 0.5 MPa the 20 mm bore pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. The male rod thread (B code) on the 10 mm rod bolts straight to tooling, and the M5x0.8 ports keep the plumbing small.
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 rule of thumb: plan on roughly 94 N of real work at 0.5 MPa (about 0.6 of the push force), which is enough to lift about 8 kg vertically with a 2:1 margin. Note that no magnet is fitted on this version - the optional -S code is what enables CMSE / DMSE switch sensing. The fixed TPU bumper at each end absorbs end-of-stroke impact, and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30B |
|---|---|
| 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 ACEJ20X70-30B
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -30 | 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 ACEJ20X70-30B Is Used
Fixture stop height setting
On a small CNC jig, the stop screw sets the exact clamp position anywhere between 40 and 70 mm, so one cylinder serves several part heights without re-plumbing.
Carton push-off on compact lines
With 157.1 N push at 0.5 MPa (about 94 N usable), the 20 mm bore nudges light cartons off a conveyor lane inside tight guarding where a longer body will not fit.
Lab sample press
The male rod thread carries a small pressing pad for capping or sample seating, and the 8 kg vertical-lift margin covers typical vial and tray weights.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30B the Right Cylinder?
At this force class, the 16 mm bore (100.5 N push at 0.5 MPa) suits lighter pick-and-place, while the 25 mm bore (245.4 N push) covers heavier clamping - the 20 mm sits between them with 157.1 N. The 70 mm stroke with a 30 mm trim window is ideal when the final position is set on the machine, not on paper. Remember the stop screw is a mechanical end stop only: it shortens the extend stroke but does not lock the piston, so on air loss the rod still drifts. Pair FA flange or LB foot mounts with the male rod thread, and if position feedback is needed later, order the -S variant to add CMSE / DMSE switches.
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 ACEJ20X70-30B FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The -30 code is a 30 mm adjustment window: a stop screw on the extend side shortens the 70 mm stroke on site, so the working range is 40-70 mm. It is a mechanical end stop, not a mid-stroke lock - on air loss the rod still drifts.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. Sensing is not fitted on this model: the magnet is the optional -S code, which allows CMSE / DMSE switches to be clipped into the body slots. Mounting options include FA flange and LB foot, and the male rod thread suits direct tooling attachment.
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