Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100S 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 SAIJ125X450-100S
The AirTAC SAIJ125X450-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a carbon steel rod, PT tapered ports, and a built-in magnet for CMSE reed and DMSE electronic sensors. With a nominal stroke of 450mm and a 100mm adjustment range, you gain a usable travel window of 350-450mm to perfectly dial in end positions without swapping hardware.
This adjustable stopper allows fine-tuning during commissioning or product changeovers, eliminating the need for external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. Because the adjuster acts only as a travel stop and not a lock, live air is required to maintain position against loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100S |
|---|---|
| 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 SAIJ125X450-100S
| 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 SAIJ125X450-100S Is Used
Variable End-Stop Machining
Dial in the 350-450mm travel window during production runs to accommodate different part lengths without changing out the entire cylinder assembly.
Product Changeover Diverters
Quickly reposition the rear stopper on a packaging line to handle varying box sizes, using the 100mm adjustment range to switch configurations rapidly.
Heavy-Duty Press Setup
Leverage the 6136N push force at 0.5 MPa for pressing applications, fine-tuning the exact bottoming position during machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-100S the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires the 6136N push force at 0.5 MPa, stepping up from a 100mm bore that provides 3927N. The 100mm adjustment window is ideal for machinery requiring variable end-stops across different product sizes, offering far more setup flexibility than a fixed-stroke SAI cylinder. For holding loads without live air pressure, consider an external rod lock or the SAIL lock variant, as the SAIJ adjuster only decelerates and sets the travel end.
When replacing an ISO 15552 cylinder, match the 125mm bore, 450mm stroke, PT port thread, and the -S magnet requirement. Since the 450mm stroke is substantial, the 32mm rod diameter handles high side loads well, but an external guide is still recommended for unsupported loads to prevent premature wear. Operating speed ranges from 30-500mm/s.
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 SAIJ125X450-100S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster allows you to shorten the effective stroke by up to 100mm, creating a usable travel window of 350-450mm from the 450mm nominal stroke. This stopper only sets the travel end and does not lock the load without live air.
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