Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-20SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 75mm 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
- Stroke75 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 ACEJ20X75-20SB
The ACEJ20X75-20SB is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore, 75 mm stroke and a male rod thread. An external stop screw trims the extend stroke anywhere within the ordered 20 mm window, giving a usable range of 55-75 mm without changing the valve or plumbing. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N and 164.9 N, with a theoretical ceiling of 32 kgf at 1.0 MPa.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit. Because the S code is on this model, the magnet is already fitted and CMSE or DMSE reed or solid-state switches can be clipped onto the body for end-of-stroke signals. In practice, plan for roughly 94 N of real work at 0.5 MPa, which is about 8 kg of safe vertical lift with a 2:1 margin. The hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends keep it running at 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 75 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 ACEJ20X75-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×75 | 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 ACEJ20X75-20SB Is Used
Fixture clamping in CNC cells
The 55-75 mm adjustable window lets a machinist dial the clamp stroke to the fixture, with 157.1 N push at 0.5 MPa enough for light aluminum part hold-down.
Small-part diverting on packaging lines
Male rod thread plus I or Y knuckle drives a pusher arm; the fitted magnet and CMSE switch confirm the divert position at up to 500 mm/s.
Sample handling in lab automation
The compact body, about 50% shorter than an ISO 15552 profile cylinder, fits inside enclosed analyzer frames where 8 kg vertical lift capacity covers vial trays.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-20SB the Right Cylinder?
Size both ways before committing: the 16 mm bore delivers 100.5 N push at 0.5 MPa, while the 25 mm bore reaches 245.4 N, so this 20 mm bore at 157.1 N sits squarely in the middle for light clamping and transfer tasks. If the load must stay put on air loss, add an external locking valve arrangement - the stop screw only sets the extend stroke and will not hold a mid-stroke position. Match FA flange or LB foot mounts plus I or Y rod knuckles to the ISO 21287 face, and remember the magnet is only present because this model carries the -S code.
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 ACEJ20X75-20SB 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 is 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke (20 mm window, usable 55-75 mm), runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, speed 30-500 mm/s, port M5x0.8, rod 10 mm with male thread, and fixed TPU bumpers at both ends.
Turn the external stop screw to shorten the extend stroke anywhere within the 20 mm window ordered - it trims the stroke, it never extends it past 75 mm, and it is a mechanical end stop rather than a mid-stroke lock. Because this model carries the optional -S magnet, CMSE or DMSE reed or solid-state switches mount directly in the body slots; models ordered without -S have no magnet. FA flange and LB foot mounts bolt to the standard ISO 21287 face.
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