Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-100S
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-100S 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 ACEJ125X120-100S
The ACEJ125X120-100S is a double acting, adjustable-stroke compact cylinder built to ISO 21287. Its 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 ceiling of 1251.4 kgf at 1.0 MPa. The -100 code gives a 100 mm adjustment window: an external stop screw trims the extend stroke anywhere between 20 and 120 mm on site, so one cylinder serves several fixture depths. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped onto the body for end-of-stroke signalling.
The hard-anodized aluminium body with a hard-chrome-plated S45C rod shrugs off abrasion in high-cycle plants, and the short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, letting heavy presses and clamping gantries fit where a full-length body cannot. A fixed TPU bumper at each end absorbs end-of-stroke shock, speed spans 30-500 mm/s, and the female M16x2.0 rod thread plus FA flange or LB foot mounting drops straight into standard fixtures. Plan on roughly 3682 N (about 375 kgf) of real work at 0.5 MPa, which lifts about 188 kg vertically with a 2:1 margin.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-100S Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-100S |
|---|---|
| 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 ACEJ125X120-100S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -100 | 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 ACEJ125X120-100S Is Used
Heavy press ram positioning
Trim the 120 mm extend stroke down to 20 mm for shallow forming dies on aluminium sheet, using the 6135.9 N push at 0.5 MPa to seat the ram without a full-stroke cycle.
Pallet clamp actuation
The 125 mm bore holds pallets in transfer stations; about 188 kg vertical lift with a 2:1 margin covers loaded Euro pallets, and CMSE switches confirm the clamp is closed.
Weld fixture clamping gantry
The short ISO 21287 body fits inside the gantry frame where an ISO 15552 profile cylinder would not, with the 100 mm window absorbing fixture height variations between part families.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X120-100S the Right Cylinder?
At this bore you are at the top of the ACEJ range: the next size down, the 100 mm bore, still pushes 3927 N at 0.5 MPa, so drop only if your load sits under about 2350 N of working force. Size the stroke by the fixture, then use the 100 mm window to trim the extend stroke in 20-120 mm range without reordering. Note the stop screw is a mechanical end stop, not a mid-stroke lock: on air loss the piston still drifts, so add a separate holding valve for suspended loads. Order FA flange or LB foot mounting to match the fixture face, and keep the -S magnet (fitted here) so CMSE / DMSE switches report position.
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 ACEJ125X120-100S 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, with a theoretical maximum of 1251.4 kgf at 1.0 MPa. The -100 code sets a 100 mm adjustment window: an external stop screw shortens the 120 mm extend stroke to any value from 20 mm up, set by hand on the machine. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the port is 1/4" (PT).
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight gantries and guards. This model carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches mount directly in the body slots for end-of-stroke detection. A fixed TPU bumper at each end absorbs end-of-stroke shock, and FA flange or LB foot mounting bolts to the standard ISO 21287 face.
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