Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50SB 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 ACEJ20X70-50SB
A double acting ISO 21287 compact cylinder, the ACEJ20X70-50SB pairs a 20 mm bore with a 70 mm stroke that an external stop screw trims anywhere in a 50 mm window, giving a usable extend range of 20-70 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 and S45C hard-chrome plated rod run on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), with speed from 30-500 mm/s.
Because the short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight jigs, guarding and gantries where a full-length cylinder will not fit. The -S magnet this model carries lets CMSE or DMSE reed or solid-state switches report end positions, and the male rod thread (B code) bolts straight to standard tooling. As a rule of thumb, plan on roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50SB |
|---|---|
| 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 ACEJ20X70-50SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -50 | 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 ACEJ20X70-50SB Is Used
Small-parts ejection from assembly dies
The 157.1 N push at 0.5 MPa clears pressed terminals or bushings off a die face, while the 20-70 mm adjustable range lets the operator tune the eject distance per part.
Position-confirmed clamping on test benches
With the fitted -S magnet, CMSE or DMSE switches verify the rod has reached the trimmed stop before a leak or electrical test starts, cutting false rejects on PCB or harness fixtures.
Compact press-fit of dowel pins
About 94 N of usable work force seats dowel pins in aluminium housings, and the short ISO 21287 body fits inside the confined envelope of a benchtop press fixture.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50SB the Right Cylinder?
Size the load against 157.1 N push at 0.5 MPa. A 16 mm bore only delivers 100.5 N, so step up if your jig needs more; a 25 mm bore gives 245.4 N if you want spare capacity. The 50 mm adjustment window suits fixtures where the exact stop position is tuned on the machine, not fixed at design time. Remember the stop screw is an end stop only - on air loss the piston drifts, so add a separate clamp if you must hold position. FA flange or LB foot mountings and I/Y rod knuckles bolt to the ISO 21287 face, and the fitted -S magnet works with 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 ACEJ20X70-50SB 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 -50 code sets a 50 mm adjustment window: an external stop screw shortens the 70 mm extend stroke by up to 50 mm, so the working range is 20-70 mm. It shortens the stroke only - it never extends past 70 mm, and it is an end stop, not a mid-stroke lock, so the rod still drifts if air is lost. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
The ISO 21287 compact body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow fixtures and tight guarding. A fixed TPU bumper at each end absorbs end-of-stroke energy without any adjustment. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches can be clipped to the body for end-position signals. The male rod thread suits threaded tooling, and FA flange or LB foot mountings plus I/Y rod knuckles bolt straight to the standard ISO 21287 face.
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