Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30 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 ACEJ20X70-30
The ACEJ20X70-30 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 -30 code gives a 30 mm window, so the usable extend stroke spans 40-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N. The hard-anodized aluminium body with an S45C hard-chrome-plated rod runs at 0.15-1.0 MPa (22-145 psi) and 30-500 mm/s.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body will not fit. Plan on roughly 94 N of usable push at 0.5 MPa rather than the full rating, which equals lifting about 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke impact, and FA flange or LB foot mounts bolt straight to the ISO 21287 face.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30 |
|---|---|
| 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 ACEJ20X70-30
| 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 ACEJ20X70-30 Is Used
Small parts press-fit in electronics assembly
The 157.1 N push at 0.5 MPa seats connectors and small bearings in PCB fixtures, and the 40-70 mm trim range lets one cylinder serve several jig depths.
Clamping on compact CNC fixtures
About 94 N of usable clamping force holds aluminium workpieces during light machining, and the short body fits inside fixture plates where an ISO 15552 profile cylinder cannot.
Ejecting parts from packaging chutes
The 70 mm stroke pushes cartons or blisters off a chute at up to 500 mm/s, with the stop screw set to 55 mm when the line runs shorter packs.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30 the Right Cylinder?
Size this bore when your load sits under about 94 N of real work at 0.5 MPa; a 16 mm bore delivers only 100.5 N push at 0.5 MPa, while stepping up to 25 mm gives 245.4 N. If you need position holding during a power loss, remember the stop screw only shortens the extend stroke - the rod still drifts when air is removed, so add a separate valve or lock for holding. Order the -S code if you want the optional magnet for CMSE / DMSE switches; this model without S has no magnet fitted. Female M6x1.0 rod thread, PT ports, FA/LB mounting.
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 ACEJ20X70-30 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The 20 mm bore has a 10 mm rod, M5x0.8 ports, a female M6x1.0 rod thread, and a 70 mm stroke adjustable down to 40 mm via the -30 stop screw. Operating range is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C on air filtered to 40 um.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at each end to soften the stops. Sensing is available only when you order the optional -S magnet code, which then accepts CMSE or DMSE switches; this model without -S carries no magnet, so no switch can be mounted. FA flange and LB foot mounts bolt directly to the ISO 21287 face.
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