Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-75S
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-75S 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 ACEJ125X300-75S
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ125X300-75S pairs a 125 mm bore with a 300 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 stroke at 0.7 MPa, with a theoretical peak of 1251.4 kgf at 1.0 MPa. The external stop screw lets you shorten the extend stroke anywhere in the 225-300 mm range on site, so one cylinder serves several fixture positions.
The hard-anodized aluminium body carries magnet slots for the -S option, which this model includes, so CMSE or DMSE reed and solid-state switches mount directly on the tube. A 25 mm S45C hard-chrome rod and a fixed TPU bumper at each end handle end-of-stroke deceleration. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into heavy presses, gantries and clamping stations where a full-length body will not fit. Plan on roughly 3680 N of usable push at 0.5 MPa, which corresponds to lifting about 375 kg vertically; halve that to around 187 kg for a 2:1 margin on real part weights.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-75S Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-75S |
|---|---|
| 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 ACEJ125X300-75S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 ACEJ125X300-75S Is Used
Heavy press and forming stations
The 6135.9 N extend force at 0.5 MPa suits stamping inserts, crimping terminals and pressing bearings into housings, with the 75 mm window letting one cylinder cover several die heights between 225 and 300 mm.
Pallet and container clamping
In warehouse automation the short body clamps pallets or totes inside tight guard envelopes, and the fitted magnet with CMSE / DMSE switches confirms clamp and release to the PLC.
Gantry lift-and-lower modules
With about 375 kg of vertical lift equivalent at 0.5 MPa, the 125 mm bore raises heavy fixtures on gantry Z-axes, using the stop screw to set the exact upper dwell for each product changeover.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X300-75S the Right Cylinder?
At this bore size the ACEJ125X300-75S sits at the top of the range: a 100 mm bore delivers 3927 N push at 0.5 MPa, while stepping up is not possible within the series, so verify load needs against the 6135.9 N extend figure. If the job needs a non-rotating rod or a rod through both ends, look at the TACE twin-guide or ACED double-rod variants instead. The stop screw is a mechanical end stop for the extend stroke only; it does not lock the piston mid-stroke, and on air loss the rod still drifts, so add a separate holding valve where a load must stay put. FA flange or LB foot mounts bolt to the ISO 21287 face, and the fitted -S magnet accepts CMSE / DMSE switches for end-position sensing.
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 ACEJ125X300-75S FAQ
At 0.5 MPa the extend stroke produces 6135.9 N and the retract stroke 5890.5 N; at 0.7 MPa extend reaches 8590.3 N, and the theoretical maximum is 1251.4 kgf at 1.0 MPa. The -75 code is a 75 mm adjustment window: an external stop screw shortens the 300 mm extend stroke on site, giving a usable range of 225-300 mm. It is a mechanical end stop, not a mid-stroke lock, so the piston still drifts if air is lost. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the 25 mm rod ends in a female M16x2.0 thread with a 1/4" PT port.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which matters in guarded cells and dense gantries. This model carries the optional -S magnet, so CMSE reed or DMSE solid-state switches clip onto the body slots for end-position signals. A fixed TPU bumper at each end absorbs end-of-stroke energy, FA flange and LB foot mounts bolt to the standard face, and the hard-anodized aluminium body with S45C hard-chrome rod runs on air filtered to 40 um from -20 to +70 C.
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