Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 55mm 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
- Stroke55 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 ACEJ20X55-20SB
The ACEJ20X55-20SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. Its 20 mm bore delivers 157.1 N push and 117.8 N pull at 0.5 MPa, rising to 219.9 N push at 0.7 MPa. The -20 code adds a 20 mm adjustment window: an external stop screw trims the 55 mm stroke on site, so the usable extend range is 35-55 mm without changing the cylinder. The B code gives a male rod thread, and the S code means the magnet is fitted, so CMSE or DMSE switches can be mounted for end-of-stroke sensing.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which makes this model easy to fit inside tight jigs, guarding and gantry frames. A hard-anodized aluminium body carries an S45C hard-chrome-plated rod, and fixed TPU bumpers at both ends absorb end-of-stroke energy. In practice, plan on roughly 94 N of usable push at 0.5 MPa, which lifts about 8 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed range is 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 55 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 ACEJ20X55-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -20 | 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 ACEJ20X55-20SB Is Used
Fixture clamping on CNC jigs
The 35-55 mm adjustable extend range lets a machinist dial in clamp travel per fixture, while 157.1 N push at 0.5 MPa secures small aluminium parts during drilling.
Ejector on small assembly stations
With the magnet fitted, CMSE or DMSE switches confirm part ejection at each cycle; the compact body slots into a tight pick-and-place gantry where a full-length cylinder will not fit.
Bottle cap press in packaging
About 8 kg of vertical lift with a 2:1 margin matches snap-on caps and small closures, and the male rod thread (B code) accepts standard press attachments directly.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-20SB the Right Cylinder?
At 157.1 N push at 0.5 MPa, the 20 mm bore sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N). Choose the 16 mm bore if your load is under about 60 N, or step up to 25 mm when you need closer to 245 N. If the stroke must be set differently on each machine, the -20 window (35-55 mm here) avoids ordering several fixed-stroke units. Remember the stop screw is an end stop only: on air loss the rod still drifts, so add a separate valve or lock if you need position holding. FA flange, LB foot and I/Y rod knuckles bolt to the ISO 21287 face, and the fitted magnet works with CMSE / DMSE switches.
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 ACEJ20X55-20SB 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; theoretical maximum is 32 kgf at 1.0 MPa. The -20 code gives a 20 mm adjustment window: an external stop screw shortens the 55 mm extend stroke on site, so the usable range is 35-55 mm. The stop is an end stop only and does not hold a load if air is lost. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, port M5x0.8, rod 10 mm with male thread.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits shallow jigs and guarded machines. Fixed TPU bumpers at both ends absorb end-of-stroke energy. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches can be mounted in the body slots for position sensing. FA flange, LB foot and I or Y rod knuckles attach to the standard ISO 21287 face.
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