Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S
The AirTAC SAIJ125X450-10-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 440-450mm, allowing you to dial back the nominal 450mm stroke by up to 10mm during machine commissioning. This bore delivers 6136N of push force at 0.5MPa, making it suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for use with CMSE reed and DMSE electronic switches. The carbon steel piston rod uses an M27x2 thread, and the pneumatic supply connects via PT tapered G1/2 ports. The rear adjuster acts purely as a mechanical stop to set the end position and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 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 SAIJ125 Adjustable Cylinder SAIJ125X450-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S Is Used
Machine Changeover
Dial in the 440-450mm travel window during product size transitions to set new end-stops without physically replacing the cylinder.
Heavy Press Positioning
Leverage the 6136N push force at 0.5MPa to move heavy jigs, using the rear screw to fine-tune the final retracted position.
Assembly Line Stops
Set precise mechanical stops for large pallets, relying on the M27x2 carbon steel rod to absorb impact with adjustable air cushions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust—stepping down to a 100mm bore yields 3927N at 0.5MPa, while stepping up to a 160mm bore provides 10053N. An adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops to fine-tune positioning on the fly without swapping components. To replace this ISO 15552 cylinder, match the 125mm bore, 450mm stroke, 10mm adjustment, PT G1/2 port, and -S magnet. Since the stroke is 450mm, an external guide is recommended to prevent excessive rod side-load on the M27x2 thread.
For load-holding requirements without continuous live air, note that the rear stopper and air cushions do not function as a brake. You would need to specify an SAIL pneumatic lock, a BSAI clamp-lock, or an external pilot-operated check valve. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-10S FAQ
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, the push force reaches 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from 450mm down to 440mm. It sets the end position but does not lock the load without live air pressure.
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