Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50S 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 ACEJ20X70-50S
A double acting ISO 21287 compact cylinder, the ACEJ20X70-50S pairs a 20 mm bore with a 70 mm stroke and a 50 mm adjustment window: an external stop screw trims the extend stroke on site anywhere from 20 to 70 mm, so one cylinder serves several fixture positions. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, and the hard-anodized aluminium body with an S45C hard-chrome plated 10 mm rod stands up to continuous jig duty.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight guarding and slide assemblies. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped anywhere along the body to flag end positions. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the female M6x1.0 rod thread accepts standard knuckles. As a rule of thumb, plan for roughly 94 N of real work at 0.5 MPa, which lifts about 8 kg vertically - halve that to 4 kg for a 2:1 margin on part handling.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50S |
|---|---|
| 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 ACEJ20X70-50S
| 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 ACEJ20X70-50S Is Used
Fixture clamp with tunable stroke
A 50 mm window lets a jig builder trim the 70 mm extend stroke to clamp thin or thick batches of brackets without swapping cylinders, with 157.1 N of push at 0.5 MPa holding light parts.
Reject pusher on a packaging line
Mounted beside a conveyor, the compact body fits under guarding, and the fitted magnet with a CMSE switch confirms the pusher has fully retracted between cartons.
Sample lift in a lab automation cell
With about 4 kg vertical lift at a 2:1 margin, the cylinder raises reagent trays in a compact analyzer frame, and the M5x0.8 ports keep tubing runs short.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-50S the Right Cylinder?
Size against the load: the 16 mm bore delivers 100.5 N push at 0.5 MPa while the 25 mm bore reaches 245.4 N, so this 20 mm bore at 157.1 N sits squarely in the middle for light clamping and slide duty. The 50 mm window covers setups where the stroke must be dialed in after commissioning. Remember the stop screw is a mechanical end stop only - on air loss the piston drifts, so add a separate lock if you need to hold a load mid-stroke. FA flange and LB foot mountings bolt straight on, and the fitted -S magnet lets CMSE / DMSE switches report position without any retrofit.
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 ACEJ20X70-50S 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 with 164.9 N pull, and theoretical maximum force is 32 kgf at 1.0 MPa. The -50 code is a 50 mm adjustment window: an external stop screw shortens the 70 mm extend stroke to any value from 20 to 70 mm. It is a mechanical end stop, not a mid-stroke lock, so the piston still drifts if air is lost.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits narrow slides and guarded gantries. The -S magnet is fitted on this model, so CMSE or DMSE reed or solid-state switches mount directly in the body slots. FA flange and LB foot brackets bolt to the standard face, the rod end is female M6x1.0, ports are M5x0.8, and a fixed TPU bumper at each end absorbs end-of-stroke impact.
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