Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-40
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-40 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 ACEJ20X75-40
A double acting ISO 21287 compact cylinder, the ACEJ20X75-40 pairs a 20 mm bore with a 75 mm stroke and an external stop screw that trims the extend stroke anywhere in a 40 mm window, giving a usable 35-75 mm range set on site with a wrench. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, enough for clamping, indexing and small part transfer in machines where every millimetre of length counts.
The hard-anodized aluminium body with an S45C hard-chrome rod saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into shallow fixtures and guarded cells. Plan on roughly 94 N of real work at 0.5 MPa (about 60% of the push rating), which corresponds to lifting around 4.8 kg vertically - or about 2.4 kg with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the optional -S magnet enables CMSE / DMSE switches.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-40 Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-40 |
|---|---|
| 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 ACEJ20X75-40
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×75 | 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 ACEJ20X75-40 Is Used
Bench-top press fixture
The 157.1 N push at 0.5 MPa clamps PCBs or small housings in a drill and tap jig, with the 40 mm window letting one cylinder serve several part heights between 35 and 75 mm.
Packaging line reject gate
Mounted beside a conveyor, the compact body fits under guarding where a full-length cylinder will not, and the 35-75 mm adjustable throw diverts off-spec cartons without re-plumbing.
Lab sample indexer
The M5x0.8 ports and 30-500 mm/s speed range suit small vials or slides stepping between stations, with the optional -S magnet and CMSE / DMSE switches confirming each position.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X75-40 the Right Cylinder?
At 157.1 N push and 117.8 N pull (0.5 MPa), bore 20 suits light clamps, gates and slides; step down to bore 16 (100.5 N push) for tighter loads or up to bore 25 (245.4 N push) when you need headroom. The 75 mm stroke is within the 100 mm standard limit for this bore, so no made-to-order stroke is needed. Choose the -S code if CMSE / DMSE position sensing is planned, FA or LB mounting to suit the fixture, and remember the stop screw only shortens the extend stroke - it is not a mid-stroke lock, so the rod still drifts if air is lost.
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 ACEJ20X75-40 FAQ
Bore 20 mm, stroke 75 mm adjustable over a 40 mm window (usable 35-75 mm). Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push rises to 219.9 N and pull to 164.9 N. Theoretical maximum is 32 kgf at 1.0 MPa. 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, female rod thread M6x1.0.
An external stop screw shortens the extend stroke on site by up to 40 mm - it is a mechanical end stop, not a mid-stroke lock, so the rod can still drift on air loss. The body carries a fixed TPU bumper at both ends to soften arrival. Position sensing requires the optional -S magnet ordered with the cylinder; without it no magnet is fitted and CMSE / DMSE switches cannot be used. FA flange or LB foot mounting bolts to the ISO 21287 face.
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