Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB 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 ACEJ20X70-20SB
A double acting compact actuator built to ISO 21287, the ACEJ20X70-20SB 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 50-70 mm range without changing the order. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa, with a theoretical ceiling of 32 kgf at 1.0 MPa. The male rod thread (B code) suits inline tooling, and the fitted -S magnet lets CMSE / DMSE switches report position.
The hard-anodized aluminium body with an S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into cramped jigs and guarding. For sizing, treat roughly 94 N (about 9.6 kgf) as the practical working force at 0.5 MPa, and expect around 8 kg of vertical lift with a 2:1 margin. Air supply is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and a fixed TPU bumper sits at both ends.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB |
|---|---|
| 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 ACEJ20X70-20SB
| 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 ACEJ20X70-20SB Is Used
Fixture clamp with trimmable stroke
The 50-70 mm adjustable window lets a jig builder dial in the exact clamp position on small aluminium brackets without reordering a different stroke.
Small-parts ejector on assembly benches
With 157.1 N of push at 0.5 MPa, the cylinder ejects plastic housings or stamped clips from nests at up to 500 mm/s.
Position-monitored test station
The fitted -S magnet accepts CMSE / DMSE switches, so a QC rig can confirm the rod has reached the trimmed extend position before the next cycle.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB the Right Cylinder?
At 157.1 N push (0.5 MPa) this 20 mm bore covers light clamping and small-part transfer. Step down to the 16 mm bore (100.5 N) for lighter loads, or up to the 25 mm bore (245.4 N) when the job needs more muscle. Remember the stop screw is an end stop only: on air loss the piston drifts, so it is not a mid-stroke lock. FA flange or LB foot mountings bolt to the ISO 21287 face, and this unit already carries the -S magnet for CMSE / DMSE switch 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 ACEJ20X70-20SB FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push reaches 219.9 N, and the theoretical maximum is 32 kgf at 1.0 MPa. The 20 mm bore runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C. The stop screw shortens the 70 mm extend stroke within the ordered 20 mm window, and the M5x0.8 port matches this bore size.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder. FA flange and LB foot mountings attach to the standard face, and the male rod thread (B code) takes inline tooling. A fixed TPU bumper decelerates the piston at each end of travel. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped to the body for end-position sensing.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-20SB
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.