Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50 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 ACEJ20X70-50
The ACEJ20X70-50 is a double acting compact cylinder built to ISO 21287, with a 20 mm bore, 70 mm stroke and a 50 mm adjustment window. An external stop screw lets you trim the extend stroke anywhere from 20 to 70 mm on site, so one cylinder serves several fixture positions. At 0.5 MPa it pushes with 157.1 N, and its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder - ideal for tight jigs, guards and gantries.
The hard-anodized aluminium body carries a S45C hard-chrome plated 10 mm rod, with a fixed TPU bumper at each end to absorb end-of-stroke shock. 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. The magnet is not fitted on this version; order the -S code if you want CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50 |
|---|---|
| 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 ACEJ20X70-50
| 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 ACEJ20X70-50 Is Used
Small-parts ejector on assembly fixtures
The 20-70 mm adjustable extend stroke lets one cylinder serve multiple part heights on a jig, with 157.1 N of push at 0.5 MPa enough to seat connectors or press small pins.
Packaging line part diverter
Compact 20 mm bore body slots beside narrow conveyor frames where a full-length profile cylinder will not fit, and the stop screw dials in the exact divert position.
Lab and test-rig actuation
Speed range 30-500 mm/s and fine stroke trimming from 20 to 70 mm suit sample indexing and light test cycles, with the M5x0.8 port keeping tubing runs minimal.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50 the Right Cylinder?
At this bore size the 20 mm version delivers 157.1 N push / 117.8 N pull at 0.5 MPa; step down to a 16 mm bore for about 100.5 N push, or up to 25 mm for 245.4 N push if the load grows. Remember the stop screw only shortens the extend stroke - it is not a mid-stroke lock, so the rod will drift if air is lost. Mounting: FA flange or LB foot brackets plus I/Y rod knuckles bolt straight to the ISO 21287 face; add the -S magnet code if CMSE / DMSE switches are 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 ACEJ20X70-50 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N. Theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, air filtered to 40 um, and the extend stroke is adjustable from 20 to 70 mm via the stop screw.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at both ends and FA/LB mounting options. Sensing requires the optional -S magnet code - this model has no magnet fitted, so CMSE / DMSE switches cannot be mounted unless -S is ordered.
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 ACEJ20X70-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.