Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40S 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 ACEJ20X55-40S
A double acting ISO 21287 compact cylinder, the ACEJ20X55-40S pairs a 20 mm bore with a 55 mm stroke and a 40 mm adjustment window: an external stop screw trims the extend stroke anywhere between 15 and 55 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N push at 0.7 MPa, with a theoretical peak of 32 kgf at 1.0 MPa. As a rule of thumb, plan on roughly 94 N (about 9.6 kgf) of usable push at 0.5 MPa, which corresponds to lifting around 4.8 kg vertically with a 2:1 margin.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body will not fit. The hard-anodized aluminium barrel carries an S45C hard-chrome rod, fixed TPU bumpers absorb end-of-stroke energy at both ends, and because this model carries the -S magnet option, CMSE or DMSE reed and solid-state switches can be mounted directly in the body slots.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40S |
|---|---|
| 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 ACEJ20X55-40S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | 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 ACEJ20X55-40S Is Used
Fixture clamp on a small CNC jig
The 15-55 mm adjustable window lets one cylinder serve several fixture variants, while about 94 N of usable push at 0.5 MPa holds light aluminium parts during drilling.
Reject pusher on a packaging line
With the fitted -S magnet and a DMSE switch, the PLC confirms the 55 mm extend before the pusher kicks off-spec cartons off a narrow conveyor.
Sample lift in a lab automation module
The vertical-lift margin of about 4.8 kg covers vial racks and trays, and the short body fits inside compact analyzer frames where an ISO 15552 profile cylinder is too long.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40S the Right Cylinder?
At 157.1 N push (0.5 MPa) this 20 mm bore suits light clamping, sorting and small part transfer. Step down to a 16 mm bore (100.5 N push) for lighter loads, or up to a 25 mm bore (245.4 N push) when the duty grows. Remember the stop screw is a mechanical end stop for the extend stroke only: on air loss the piston still drifts, so it is not a mid-stroke lock. FA flange or LB foot mounts and I/Y rod knuckles bolt to the standard ISO 21287 face, and the fitted -S magnet lets CMSE / DMSE switches report end positions. Speed range 30-500 mm/s, pressure 0.15-1.0 MPa (22-145 psi).
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 ACEJ20X55-40S FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push reaches 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The ordered stroke is 55 mm and the -40 stop screw trims the extend stroke down to 15 mm, all within a 30-500 mm/s speed range at 0.15-1.0 MPa (22-145 psi).
It is an ISO 21287 compact cylinder, roughly 50% shorter in mounting length than an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod, M6x1.0 female rod thread and an M5x0.8 port. Fixed TPU bumpers at each end absorb end-of-stroke impact, FA/LB mounting and I/Y knuckles bolt to the standard face, and because this model carries the optional -S magnet, CMSE / DMSE switches mount in the body slots.
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