Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20B
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20B 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 ACEJ20X70-20B
A double acting compact cylinder built to ISO 21287, the ACEJ20X70-20B pairs a 20 mm bore with a 70 mm stroke and an external stop screw that trims the extend stroke by up to 20 mm on site, giving a usable range of 50-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. The male rod thread (B code) bolts straight to tooling, and the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder.
Plan on roughly 94 N of real work at 0.5 MPa (about 60% of the push rating), which is the equivalent of lifting about 8 kg vertically with a 2:1 margin. The hard-anodized aluminium body carries the S45C hard-chrome rod, fixed TPU bumpers sit at both ends, and the optional -S magnet enables CMSE / DMSE switches - without that code no magnet is fitted. Speed range is 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20B Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20B |
|---|---|
| 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 ACEJ20X70-20B
| 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 ACEJ20X70-20B Is Used
Small-parts press fitting
Presses dowel pins or bushings into aluminium housings on an electronics assembly line, where the 50-70 mm adjustable window lets one cylinder serve several housing depths.
Pick-and-place lift stations
Raises about 8 kg of fixture or part weight vertically with a 2:1 margin, fitting the tight Z-axis envelope of a compact gantry thanks to the short ISO 21287 body.
Jig clamping on CNC fixtures
Clamps machined brackets against a hard stop with 157.1 N at 0.5 MPa, the male rod thread (B) threading directly into a custom clamp arm.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20B the Right Cylinder?
At this bore size the ACEJ20X70-20B delivers 157.1 N push at 0.5 MPa; step down to a 16 mm bore (100.5 N) for lighter clamping or up to a 25 mm bore (245.4 N) when the load grows. The 70 mm stroke sits well inside the 100 mm maximum standard stroke for bore 20, so no made-to-order stroke is needed. 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 FA flange or LB foot mounting to suit the fixture, and add the -S code if CMSE / DMSE position sensing is planned.
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 ACEJ20X70-20B 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. Operating pressure is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure, speed 30-500 mm/s, air filtered to 40 um, and -20 to +70 C temperature range. The port is M5x0.8 and the rod end is a male thread (B code).
An external stop screw shortens the 70 mm extend stroke by up to 20 mm, so the working range is 50-70 mm; it acts as an end stop only and never holds a load if air is lost. Sensing requires the optional -S magnet code - this model has no magnet fitted, so CMSE or DMSE switches can only be used when the magnet is ordered. Fixed TPU bumpers absorb the end-of-stroke shock at both ends.
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