Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-10
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-10 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 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 ACEJ125X300-10
The ACEJ125X300-10 is a double acting ISO 21287 compact cylinder with an adjustable extend stroke. A 125 mm bore delivers 6135.9 N push and 5890.5 N pull at 0.5 MPa, rising to 8590.3 N push at 0.7 MPa, with a theoretical maximum of 1251.4 kgf at 1.0 MPa. An external stop screw trims the 300 mm extend stroke by up to 10 mm on site, so the usable extend range is 290-300 mm without changing the cylinder.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which matters when a 300 mm stroke press or clamp must fit inside a guarded frame. Plan on roughly 3680 N of real work at 0.5 MPa (about 0.6 of the push rating), which is a vertical lift of around 375 kg, or roughly 187 kg with a 2:1 margin. The hard-anodized aluminium body carries a 25 mm S45C hard-chrome rod, fixed TPU bumpers absorb end-of-stroke energy, and the optional -S magnet enables CMSE / DMSE switches when ordered.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-10 Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-10 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 300 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 ACEJ125X300-10
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -10 | 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 ACEJ125X300-10 Is Used
Heavy press-fit station
The 6135.9 N push at 0.5 MPa suits pressing bearings or bushings into housings on an automotive assembly line, with the 10 mm window letting you trim the 300 mm stroke to the exact press depth.
Clamping large weld fixtures
A 125 mm bore holds sheet-metal weld fixtures shut through the weld cycle, and the compact body fits where a full-length ISO 15552 profile cylinder would not clear the fixture frame.
Lift-and-lower gate actuator
With about 375 kg of vertical lift equivalent at 0.5 MPa (roughly 187 kg at a 2:1 margin), the cylinder raises and lowers heavy machine guards or pallet stops at 30-500 mm/s.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-10 the Right Cylinder?
At this force class the ACEJ125X300-10 sits near the top of the range: the 100 mm bore pushes 3927.0 N at 0.5 MPa, while the 125 mm bore here pushes 6135.9 N. If your load needs less than about 3680 N of working force, the 100 mm bore saves space and air; if you need the full 6135.9 N, this is the right size. Note that the stop screw is a mechanical end stop only - on air loss the piston drifts, so it is not a load-holding lock. Mounting: FA flange or LB foot bolt to the ISO 21287 face, with I and Y rod knuckles available. This unit has a female M16x2.0 rod thread and PT ports; order the -S code if you need the magnet for CMSE / DMSE switches.
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 ACEJ125X300-10 FAQ
At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N; at 0.7 MPa it pushes 8590.3 N and pulls 8246.7 N. The theoretical maximum is 1251.4 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with proof pressure of 1.5 MPa (215 psi), running on air filtered to 40 um at 30-500 mm/s and -20 to +70 C.
The -10 code is a 10 mm window: an external stop screw shortens the 300 mm extend stroke to any length from 290 to 300 mm, set on site with a wrench. Fixed TPU bumpers at both ends absorb end-of-stroke energy. The ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange or LB foot mounts bolt straight on. The magnet is the optional -S code; without it no CMSE / DMSE switch can be mounted.
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