Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X275-50
The AirTAC Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X275-50 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 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 ACEJ125X275-50
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ125X275-50 pairs a 125 mm bore with a 275 mm stroke and a 50 mm adjustment window. At 0.5 MPa it pushes 6135.9 N and pulls 5890.5 N, rising to 8590.3 N at 0.7 MPa, which puts it at the top of the ACEJ force range. The external stop screw trims the extend stroke on site anywhere between 225 and 275 mm, so one cylinder can serve several fixture positions without re-ordering.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, a real advantage when a 6-ton-class actuator must fit inside a guard or press frame. A rough sizing rule: keep real work to about 3680 N (0.6 of the push figure), which corresponds to lifting roughly 375 kg vertically, or about 310 kg with a 2:1 margin. The hard-anodized aluminium body carries a S45C hard-chrome plated 25 mm rod, fixed TPU bumpers absorb end-of-stroke shock at both ends, and the optional -S magnet enables CMSE / DMSE switch sensing.
Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X275-50 Technical Specifications
| Model | Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X275-50 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø125 mm |
| Stroke | 275 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 ACEJ125X275-50
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 ACEJ125X275-50 Is Used
Heavy die clamping on press tooling
With 6135.9 N push at 0.5 MPa (8590.3 N at 0.7 MPa), the 125 mm bore clamps large stamping and forming dies, and the 50 mm window lets one cylinder serve dies of slightly different heights between 225 and 275 mm of stroke.
Lifting heavy fixture pallets in machining cells
The push force equates to lifting about 375 kg vertically at 0.5 MPa, or roughly 310 kg with a 2:1 margin - enough for loaded CNC pallets and fixtures, with the short body fitting under low machine bases.
Short-stroke pressing in assembly stations
For bearing pressing or stake-forming on automotive sub-assemblies, the stop screw sets the exact end position within the 225-275 mm range, and the fixed TPU bumper softens the impact at full extension.
Is the Airtac ACEJ125 Adjustable Compact Cylinder ACEJ125X275-50 the Right Cylinder?
Size check: a 100 mm bore ACEJ delivers 3927 N push at 0.5 MPa, while this 125 mm bore more than doubles that to 6135.9 N - choose it when clamping, pressing or lifting heavy dies and fixtures. There is no larger ACEJ bore, so if 6135.9 N at 0.5 MPa is still short of the job, step up to a different cylinder family. Note that the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock: on air loss the piston still drifts, so add a separate holding valve for suspended loads. Mounting: FA flange or LB foot bolt to the ISO 21287 face, with I and Y rod knuckles for the M16x2.0 female rod thread. Order the -S code if CMSE / DMSE position switches are needed.
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 ACEJ125X275-50 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 275 mm extend stroke on site, giving a usable range of 225-275 mm. It shortens the stroke only - it never extends it past 275 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, air filtered to 40 um, and the 1/4" port is standard for this bore.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so this heavy-force actuator fits presses, guards and gantries where a full-length body will not. Position sensing requires the optional -S magnet code: with -S ordered, CMSE / DMSE reed or solid-state switches mount in the body slots; this model, ordered without -S, has no magnet and no sensing. FA flange and LB foot mountings bolt to the ISO 21287 face, and the M16x2.0 female rod thread accepts standard I or Y knuckles. For exact weights and outline dimensions, confirm from datasheet.
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