Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50SB 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 ACEJ20X50-50SB
The ACEJ20X50-50SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 50 mm stroke anywhere in a 0-50 mm window, so one unit covers several jig positions. This 20 mm bore delivers 157.1 N push and 117.8 N pull at 0.5 MPa (219.9 N / 164.9 N at 0.7 MPa). The male rod thread (B code) and the fitted -S magnet for CMSE / DMSE switches are both on board.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into compact guarding and slide fixtures. At 0.5 MPa the push force equals roughly 16 kgf, so plan on lifting about 8 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the hard-anodized aluminium body with S45C hard-chrome rod runs at 0.15-1.0 MPa (22-145 psi) and 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50SB |
|---|---|
| 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 ACEJ20X50-50SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACEJ20X50-50SB Is Used
Small-part ejection from plastic molds
The 0-50 mm trim lets one cylinder serve several shallow mold pockets, and 157.1 N at 0.5 MPa is enough to kick lightweight nylon or POM parts clear of the cavity.
Indexing stops on rotary dial tables
Set the exact stop height with the stop screw for each fixture variant; the fitted magnet plus a CMSE switch confirms the stop is fully extended before the dial indexes.
Sample vial pressing in lab automation
About 8 kg of vertical lift with a 2:1 margin suits capping or seating 20-50 ml vials, and the compact body fits inside benchtop machine frames.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X50-50SB the Right Cylinder?
For light clamping and indexing, this 20 mm bore at 157.1 N push (0.5 MPa) sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N) - pick the 25 if your load needs more than about 90 N of working force. 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 separate brake if you must hold position. FA flange or LB foot mounts bolt to the ISO 21287 face; the -S magnet this model carries lets CMSE / DMSE switches report end positions without any extra bracket work.
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 ACEJ20X50-50SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N push and 164.9 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. Operating range is 0.15-1.0 MPa (22-145 psi) with air filtered to 40 um, proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, and temperature -20 to +70 C.
The -50 code is a 50 mm adjustment window: an external stop screw shortens the extend stroke anywhere from 50 mm down to nearly zero, so you can dial in the exact reach on site. The B code gives a male rod thread. The S code means the optional -S magnet is fitted on this unit, so CMSE / DMSE reed or solid-state switches can be clipped onto the body slot for end-position sensing. The fixed TPU bumpers only soften the ends of travel.
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