Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-10S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-10S 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 ACEJ20X70-10S
The ACEJ20X70-10S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 70 mm stroke that an external stop screw trims on site by up to 10 mm, giving a usable extend range of 60-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; a practical rule of thumb is to plan for about 94 N of real work, which corresponds to lifting roughly 4 kg vertically with a 2:1 margin. Air ports are M5x0.8, sized by the bore alone.
The hard-anodized aluminium body with an S45C hard-chrome plated rod runs at 0.15-1.0 MPa (22-145 psi) and 30-500 mm/s, with a fixed TPU bumper at each end absorbing stop energy. 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. Because the S code is ordered, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be clamped straight into the body slots.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-10S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-10S |
|---|---|
| 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 ACEJ20X70-10S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -10 | 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 ACEJ20X70-10S Is Used
Fixture clamping on CNC pallets
The 157.1 N push at 0.5 MPa clamps small aluminium or plastic workpieces in machining fixtures, and the 60-70 mm trim range lets a jig builder fine-tune clamp position without changing the cylinder.
Position-verified ejector on small assembly stations
With the -S magnet fitted, CMSE or DMSE switches confirm the 70 mm eject stroke on electronics assembly lines, while the compact body fits under low interplate guards.
Sample pusher in lab automation
A 10 mm adjustable window and 30-500 mm/s speed let a lab integrator dial in gentle sample tray pushes, and the 32 kgf theoretical max leaves headroom at higher pressure.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-10S the Right Cylinder?
Size up or down by force: a 16 mm bore gives 100.5 N push at 0.5 MPa, while a 25 mm bore raises that to 245.4 N, so the 20 mm bore at 157.1 N sits between them for light clamping and positioning. If your stroke may change during commissioning, the 10 mm trim window on this model avoids re-ordering; for a fixed stroke the plain ACE in the same bore is the simpler choice. FA flange or LB foot mounts and I or Y rod knuckles bolt to the ISO 21287 face, and the fitted -S magnet lets CMSE / DMSE switches report end positions. Remember the stop screw sets the extend end only - it is not a mid-stroke lock, so the rod can drift if air is lost.
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 ACEJ20X70-10S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa that rises to 219.9 N push and 164.9 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure is 1.5 MPa (215 psi), speed is 30-500 mm/s, and the fluid is air filtered to 40 um. For sizing, treat roughly 94 N as the usable working force at 0.5 MPa, about 4 kg of vertical lift with a margin.
The -10 code is a 10 mm window: an external stop screw shortens the 70 mm extend stroke to any length from 60 to 70 mm, and a fixed TPU bumper decelerates the piston at each end. The magnet is the optional -S feature and this model carries it, so CMSE / DMSE reed or solid-state switches mount in the body slots. FA flange, LB foot, FTC brackets and I/Y rod knuckles fit the ISO 21287 face, and the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder.
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