Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30SB 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 ACEJ20X70-30SB
The ACEJ20X70-30SB 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 on site, giving a usable range of 40-70 mm without swapping the cylinder. At 0.5 MPa the 20 mm bore delivers 157.1 N of push force, and the male rod thread (B code) bolts straight to external tooling.
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. The hard-anodized aluminium body carries an S45C hard-chrome rod, fixed TPU bumpers absorb end-of-stroke energy, and the fitted -S magnet lets CMSE / DMSE switches report position. As a rule of thumb, plan for about 94 N of real work at 0.5 MPa, which lifts roughly 8 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30SB |
|---|---|
| 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 ACEJ20X70-30SB
| 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 ACEJ20X70-30SB Is Used
Bench-top press fixture
The 157.1 N push at 0.5 MPa suits light press-fitting of bushings or terminals, with the 30 mm window letting the operator dial the 70 mm stroke down to 40 mm for a shorter, faster cycle.
Small-part ejection on assembly machines
With the fitted -S magnet, CMSE or DMSE switches confirm part ejection at each stroke, and the compact body fits the tight envelope under a rotary indexing table.
Pick-and-place drop station
The male rod thread mounts a gripper or suction tooling directly, and the stop screw trims the drop depth between 40 and 70 mm to match tray height without re-gapping the fixture.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30SB the Right Cylinder?
Size the bore against the load: at 0.5 MPa the 16 mm bore pushes 100.5 N and the 25 mm bore pushes 245.4 N, so the 20 mm bore at 157.1 N sits squarely between them for medium clamping and positioning. If the cylinder must hold a load through a power loss, add an external stop - the adjuster is a mechanical end stop for the extend stroke, not a mid-stroke lock. FA flange or LB foot mountings bolt to the ISO 21287 face, and the male rod thread suits knuckle or tooling attachment.
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 ACEJ20X70-30SB 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, with a theoretical maximum of 32 kgf at 1.0 MPa. The -30 code sets a 30 mm adjustment window: an external stop screw shortens the 70 mm extend stroke by up to 30 mm, so the working range is 40-70 mm. It is double acting, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, and travels at 30-500 mm/s.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body and S45C hard-chrome rod. Fixed TPU bumpers at both ends absorb end-of-stroke impact; they do not hold or brake a load. FA flange and LB foot mountings bolt to the standard face, the rod end is male thread, and because this model carries the optional -S magnet, CMSE / DMRE switches - correctly CMSE / DMSE reed or solid-state switches - can be mounted for position feedback.
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