Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-30S
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-30S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 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 ACEJ125X120-30S
A double acting ISO 21287 compact cylinder, the ACEJ125X120-30S pairs a 125 mm bore with a 120 mm stroke and a 30 mm adjustable 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. The external stop screw trims the extend stroke anywhere in the 90-120 mm range on site, so one cylinder serves several fixture positions without changing hardware.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which matters when a 125 mm bore must fit inside a press frame or guard. A hard-anodized aluminium body runs on an S45C hard-chrome plated 25 mm rod, with a fixed TPU bumper at each end. As an -S model it carries the optional magnet, so CMSE / DMSE switches can report end positions. For sizing, treat roughly 0.6 of the push force, about 3680 N, as the practical working force, which corresponds to lifting around 313 kg vertically with a 2:1 margin.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-30S Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-30S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 120 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 ACEJ125X120-30S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -30 | 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 ACEJ125X120-30S Is Used
Heavy press fixture positioning
The 6135.9 N push at 0.5 MPa clinches steel brackets in welding fixtures, while the 30 mm window lets one cylinder serve both shallow and deep part variants between 90 and 120 mm.
Pallet lift-and-lower stations
With about 313 kg of vertical lift capacity at a 2:1 margin, the 125 mm bore raises loaded pallets on assembly lines; CMSE switches on the -S magnet confirm top-of-stroke.
Gate and clamp actuation on foundry equipment
The compact body, roughly half the mounting length of an ISO 15552 profile cylinder, slots into guarded sand-handling gates where a full-length 125 mm bore cannot fit.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-30S the Right Cylinder?
At this bore size nothing smaller in the ACEJ range comes close: a 100 mm bore manages 3927 N push at 0.5 MPa, barely 64% of this model's 6135.9 N, while the 125 mm is the largest bore offered. If the job needs only 2500-3500 N, step down to the 100 mm and save air consumption. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock: on air loss the piston still drifts, so add a separate holding valve for suspended loads. FA flange or LB foot mountings bolt to the ISO 21287 face, and the -S magnet already fitted accepts 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 ACEJ125X120-30S 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 -30 code sets a 30 mm adjustment window: an external stop screw shortens the 120 mm extend stroke by up to 30 mm, giving a usable range of 90-120 mm. It is a mechanical end stop only, not a load-holding brake. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, air filtered to 40 um.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, an S45C hard-chrome plated 25 mm rod and a fixed TPU bumper at both ends; the body is about 50% shorter in mounting length than an ISO 15552 profile cylinder. The rod end is female M16x2.0, the air port is 1/4" PT, and FA flange or LB foot mountings bolt straight on. This -S model carries the optional magnet, so CMSE / DMSE reed or solid-state switches can be mounted for end-position sensing.
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Standard models are processed and dispatched in 3-5 business days.
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