Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X80-50
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X80-50 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 80mm 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
- Stroke80 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 ACEJ125X80-50
The ACEJ125X80-50 is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: a 125 mm bore, an 80 mm nominal stroke and a 50 mm stop-screw window, so the usable extend range is 30-80 mm. At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N; at 0.7 MPa push rises to 8590.3 N. The hard-anodized aluminium body with an S45C hard-chrome-plated 25 mm rod runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s.
Its short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why big-bore presses and clamping gantries fit it where a full-length cylinder will not. In practice, plan for roughly 3680 N of real work at 0.5 MPa, and it lifts about 313 kg vertically with a 2:1 margin. A fixed TPU bumper at each end absorbs end-of-stroke impact, and FA flange or LB foot mounts bolt straight to the ISO 21287 face.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X80-50 Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X80-50 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 80 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 ACEJ125X80-50
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×80 | Stroke length in mm. |
| -50 | 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 ACEJ125X80-50 Is Used
Heavy press-fit station
With about 3680 N of usable force at 0.5 MPa, the 125 mm bore presses bearings and bushings into housings on an automotive assembly line, while the 50 mm window lets you dial the 80 mm stroke down to the exact ram travel each part needs.
Clamping fixture on a machining centre
The short ISO 21287 body fits inside the guard envelope of a CNC fixture where an ISO 15552 profile cylinder would not, holding cast-iron blocks of roughly 313 kg equivalent vertical load during milling.
Lift-and-lower ejector in a stamping cell
Mounted LB foot under a stamping die, the cylinder ejects heavy formed panels at 30-500 mm/s, with the stop screw set so the ram retracts clear of the transfer rail every cycle.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X80-50 the Right Cylinder?
At this force class the 125 mm bore is near the top of the ACEJ range: it delivers 6135.9 N push at 0.5 MPa where an 80 mm bore gives 2513.3 N and a 63 mm bore 1558.6 N. Step down to 80 mm if your load is under about 1500 N of working force; stay at 125 mm for heavy clamping and pressing. The -50 stop screw trims the extend stroke down to 30 mm on site but never lengthens it past 80 mm, and it is a mechanical end stop only - on air loss the piston still drifts, so add a separate valve or lock if you must hold a load mid-stroke. Rod end is female M16x2.0, ports are 1/4" PT, and this version has no magnet: order the -S code if you later need CMSE / DMSE switch positioning.
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 ACEJ125X80-50 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 -50 code is a 50 mm adjustment window: an external stop screw shortens the 80 mm extend stroke on site, giving a usable range of 30-80 mm. It cannot lengthen the stroke past 80 mm, and the stop is not a mid-stroke lock - on air loss the piston still drifts.
It is an ISO 21287 compact cylinder whose short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA flange and LB foot mounting on the standard ISO 21287 face. A fixed TPU bumper at each end absorbs end-of-stroke impact. This version ships without a magnet; order the optional -S code to enable CMSE / DMSE reed or solid-state switches for end-of-stroke signalling.
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