Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 125mm stroke, 1/4" 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.
- BoreØ125 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM16×2.0
- CushionFixed TPU bumper (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ125X125-75S pairs a 125 mm bore with a 125 mm stroke and a 75 mm trimming window. At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N, rising to 8590.3 N on the extend side at 0.7 MPa. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so heavy clamping or pressing stations fit into frames where a full-length profile cylinder cannot. The S code means the magnet is fitted, so CMSE / DMSE reed or solid-state switches can be mounted anywhere along the body slots.
The stop screw on the front cover shortens the extend stroke on site by up to 75 mm, giving a usable range of 50-125 mm without changing the cylinder. Plan on roughly 3682 N of real work at 0.5 MPa rather than the full rating, which corresponds to lifting about 313 kg vertically with a 2:1 margin. A hard-anodized aluminium body, S45C hard-chrome plated 25 mm rod, fixed TPU bumpers at both ends and a female M16x2.0 rod thread complete the package. Speed range is 30-500 mm/s over 0.15-1.0 MPa (22-145 psi).
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/4" |
| Rod thread | M16×2.0 |
| 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 300 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5890 N |
| 0.7 MPa | 8590 N | 8247 N |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -75 | 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 ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S Is Used
Heavy press and forming stations
With 6135.9 N push at 0.5 MPa and 8590.3 N at 0.7 MPa, this bore handles staking, crimping and light forming on aluminium extrusions and sheet-metal brackets where the short ISO 21287 body must fit inside a press frame.
Pallet and die clamping on transfer lines
The 50-125 mm adjustable range lets toolmakers trim clamp positions after die changes, while the fitted -S magnet feeds CMSE / DMSE switch signals to the line PLC for clamp-confirmed interlocks.
Vertical lift in machine-tool fixtures
Lifts about 313 kg vertically with a 2:1 margin, enough to raise heavy jigs, chucks or weld fixtures in machining cells; the fixed TPU bumpers absorb the end-of-stroke shock at 30-500 mm/s.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S the Right Cylinder?
At this bore size the choice is narrow: 125 mm is the largest ACEJ bore, delivering 6135.9 N push at 0.5 MPa where an 80 mm bore gives 2513.3 N and a 100 mm bore gives 3927.0 N. If your press or clamp needs more than about 5500 N of working force, this is the right frame; if 3000-3900 N suffices, the 100 mm bore saves air and cost. The 75 mm window suits fixtures where the final position is tuned after installation. Note the stop screw is a mechanical end stop only: on air loss the piston still drifts, so add a separate locking solution if the load must be held. FA flange or LB foot mounts bolt to the ISO 21287 face, and I or Y rod knuckles suit the M16x2.0 female thread.
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 ACEJ125 Adjustable Compact Cylinder ACEJ125X125-75S FAQ
At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N; at 0.7 MPa push is 8590.3 N and pull 8246.7 N; theoretical maximum is 1251.4 kgf at 1.0 MPa. The -75 code sets a 75 mm adjustment window: an external stop screw shortens the 125 mm extend stroke by up to 75 mm, so the working range is 50-125 mm. It is double acting, runs on air filtered to 40 um at 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. The stop is an end stop, not a mid-stroke lock.
It is an ISO 21287 compact cylinder, about 50% shorter in mounting length than an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome plated 25 mm rod and fixed TPU bumpers at both ends. Air ports are 1/4" (PT thread) and the rod end carries a female M16x2.0 thread. Because this model carries the optional -S magnet, CMSE / DMSE reed or solid-state switches can be slid into the body slots for end-of-stroke sensing. FA flange and LB foot mounts plus I/Y rod knuckles bolt straight to the standard ISO 21287 face.
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