Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 50mm 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
- Stroke50 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 ACEJ20X50-40SB
This is a double acting AirTAC ACEJ compact cylinder built to ISO 21287, with a 20 mm bore, 50 mm stroke and a male-threaded rod. An external stop screw trims the extend stroke anywhere inside the 40 mm window, so the working range runs from 10 to 50 mm without changing hardware. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. The short ISO 21287 body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight fixtures and guarding where a full-length body cannot.
Because the -S magnet is fitted on this model, CMSE or DMSE reed and solid-state switches mount directly in the body slots for end-of-stroke signalling. Plan on about 94 N of usable push at 0.5 MPa (roughly 60% of the rating), which corresponds to lifting about 8 kg vertically - or about 4 kg with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke shock, the hard-anodized aluminium body resists wear, and the S45C hard-chrome rod keeps friction low over 30-500 mm/s cycles.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 50 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 ACEJ20X50-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-40SB Is Used
Benchtop press fixture
The 157.1 N push at 0.5 MPa suits light staking and marking of small aluminium brackets, and the 10-50 mm adjustable range lets one fixture handle several bracket heights.
Carton reject pusher
On a packaging line, the short ISO 21287 body fits between conveyor guard rails, while the fitted magnet and a CMSE switch confirm each reject stroke completed.
Lab sample clamping
About 8 kg of vertical equivalent force is enough to hold sample trays in test rigs, and the male-threaded rod accepts custom clamp tips directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-40SB the Right Cylinder?
Check the load first: at 0.5 MPa this bore delivers 157.1 N of push, so size the task to about 94 N of real work. If your part weighs more than roughly 4 kg on a vertical lift, step up to the 25 mm bore (245.4 N push at 0.5 MPa); if you need less force and a shorter body, the 16 mm bore gives 100.5 N. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock - on air loss the piston drifts, so add a valve or external stop where holding matters. FA flange and LB foot mounts plus I/Y rod knuckles bolt to the standard ISO 21287 face, and the fitted -S magnet lets you add CMSE/DMSE switches without reordering.
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 ACEJ20X50-40SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The ordered stroke is 50 mm and the -40 stop screw trims the extend stroke by up to 40 mm, giving a usable 10-50 mm range. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the port is M5x0.8.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow jigs and guards. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches mount in the body slots. Fixed TPU bumpers at both ends absorb end-of-stroke energy, and FA flange or LB foot mounts bolt to the standard face.
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