Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40SB 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 ACEJ20X70-40SB
The ACEJ20X70-40SB 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 40 mm on site, giving a usable range of 30-70 mm without changing the cylinder. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa. The male rod thread (B code) bolts straight to tooling, and the short 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.
In practice, plan for roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating), which corresponds to lifting about 8 kg vertically - or about 4 kg with a 2:1 margin. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be mounted in the body slots for end-of-stroke signalling. A fixed TPU bumper at each end absorbs end-of-stroke energy, the hard-anodized aluminium body runs on a hard-chrome S45C rod, and speed is 30-500 mm/s at 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40SB |
|---|---|
| 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 ACEJ20X70-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -40 | 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 ACEJ20X70-40SB Is Used
Fixture clamping on CNC pallets
The 157.1 N push at 0.5 MPa clamps aluminium or plastic workpieces in machining fixtures, and the 30-70 mm trim range lets the setter match the clamp point to each pallet without swapping cylinders.
Small-part diverting on packaging lines
With the -S magnet fitted, CMSE switches confirm extend and retract as the rod kicks light cartons or blisters off a conveyor at 30-500 mm/s, all inside a body about 50% shorter than an ISO 15552 profile cylinder.
Sample press in lab automation
The male rod thread mounts a pressing pad directly, and about 8 kg of vertical lift capacity (with margin, about 4 kg) suits pressing caps onto vials or test plates in compact diagnostic instruments.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-40SB the Right Cylinder?
Check the load first: at 0.5 MPa this 20 mm bore pushes 157.1 N. If your jig needs more, step up to the 25 mm bore (245.4 N push at 0.5 MPa); if less force and a shorter body work, the 16 mm bore gives 100.5 N. The 40 mm window means you can dial the extend stroke anywhere from 30 to 70 mm, which suits fixtures where the final position is tuned during commissioning. Remember the stop screw is a mechanical end stop only - on air loss the piston drifts, so it is not a mid-stroke lock. Mount with FA flange or LB foot brackets, and keep the -S magnet in the code if you need CMSE / DMSE switch feedback; this model already has it fitted.
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 ACEJ20X70-40SB 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; the theoretical maximum is 32 kgf at 1.0 MPa. The -40 code is a 40 mm adjustment window: an external stop screw shortens the 70 mm extend stroke by up to 40 mm, so the working range is 30-70 mm. It shortens the stroke only - it never extends it past 70 mm, and it is a mechanical end stop, not a load-holding lock.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, an S45C hard-chrome rod with male thread, and a fixed TPU bumper at both ends that absorbs end-of-stroke energy. The body is about 50% shorter in mounting length than an ISO 15552 profile cylinder. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped into the body slots; air supply is 0.15-1.0 MPa (22-145 psi) filtered to 40 um, with an M5x0.8 port and FA flange or LB foot mounting.
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