Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40 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 ACEJ20X55-40
A double acting ISO 21287 compact cylinder, the ACEJ20X55-40 pairs a 20 mm bore with a 55 mm stroke and an external stop screw that trims the extend stroke anywhere in a 40 mm window, giving a usable range of 15-55 mm on site. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. The hard-anodized aluminium body with an S45C hard-chrome plated rod runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s, from -20 to +70 C.
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. For sizing, plan on 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 with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke energy, and FA flange or LB foot mounts plus I/Y rod knuckles bolt straight to the ISO 21287 face. No magnet is fitted; order the -S code if you need CMSE / DMSE switch sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40 |
|---|---|
| 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 ACEJ20X55-40
| 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 ACEJ20X55-40 Is Used
Small-part ejection from molds
The 15-55 mm adjustable extend range lets a molder dial in exactly the kick needed to clear a 20 g nylon clip from a two-cavity tool, with 157.1 N of push at 0.5 MPa ample for the job.
Gate and latch actuation on packaging machines
Mounted via an FA flange behind a guarding sheet, the compact body needs about half the depth of an ISO 15552 profile cylinder, and the stop screw sets the gate opening without shimming.
Sample pusher in lab automation
A 96-well plate rack weighing about 6 kg slides into position under the roughly 8 kg vertical-lift equivalent of this bore, with the M5x0.8 ports keeping plumbing minimal in tight decks.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40 the Right Cylinder?
At 157.1 N push at 0.5 MPa, the 20 mm bore suits light clamping and positioning. Step down to the 16 mm bore (100.5 N push) for smaller loads, or up to the 25 mm bore (245.4 N push) when you need more margin. The 55 mm stroke sits well inside the 100 mm maximum standard stroke for this bore. Remember the stop screw only shortens the extend stroke within the 40 mm window and drifts on air loss, so it is not a load lock. Choose the female M6x1.0 rod thread as coded, add FA or LB mounting to match the fixture, and specify the -S magnet option only if CMSE / DMSE position sensing is required.
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 ACEJ20X55-40 FAQ
This 20 mm bore unit pushes 157.1 N and pulls 117.8 N at 0.5 MPa; at 0.7 MPa push rises to 219.9 N and pull to 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke: the stop screw trims the 55 mm stroke by up to 40 mm, so the working range is 15-55 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, port M5x0.8, rod thread M6x1.0 female, and a fixed TPU bumper sits at both ends.
The ACEJ20X55-40 uses a hard-anodized aluminium body with a roller-burnished bore and an S45C hard-chrome plated 10 mm rod, in the short ISO 21287 compact format that saves about 50% of the mounting length of an ISO 15552 profile cylinder. FA flange and LB foot mounts plus I/Y rod knuckles attach to the standard ISO 21287 face. Sensing requires the optional -S magnet code; this model without -S carries no magnet, so CMSE or DMSE switches can only be used when that option is ordered.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.