Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20S 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 SAIJ125X450-20S
The AirTAC SAIJ125X450-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 450 mm stroke by up to 20 mm. This creates a precise 430-450 mm usable travel window, letting you fine-tune the retract end position at commissioning without swapping hardware. It delivers a robust 6136 N pull force at 0.5 MPa, making it ideal for moving heavy loads.
This -S variant includes a magnet for position sensing and uses PT tapered ports. The extruded aluminum barrel features sensor grooves on both sides for CMSE reed and DMSE electronic switches. Because the stroke is 450 mm, the M27x2 rod should be guided externally to prevent excessive side-loading. The rear adjuster acts purely as a travel stop and does not hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20S |
|---|---|
| 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 SAIJ125X450-20S
| 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 SAIJ125X450-20S Is Used
Product Changeover
Dial in the 430-450 mm retract window instantly when switching machinery to handle different product lengths without changing the cylinder.
End-Position Tuning
Fine-tune the final retract position during machine commissioning to achieve exact alignment without adding external mechanical stops.
Heavy Load Shifting
Leverage the 6136 N pull force at 0.5 MPa to move heavy pallets or assemblies, using the adjustable stop to set precise resting points.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20S the Right Cylinder?
Choose this 125 mm bore when you need high thrust (6136 N pull at 0.5 MPa) combined with a variable end-stop. If your application requires less force, stepping down to an 80 mm bore yields 2268 N pull, while moving up to a 160 mm bore provides 9425 N pull. The adjustable stroke is perfect for machine setups requiring product-size changeovers, replacing the need for fixed-stroke SAI cylinders.
For ISO 15552 replacement matching, verify the 125 mm bore, 450 mm stroke, 20 mm adjustment range, PT port threads, and the -S magnet option. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB and CA options. If your process requires the load to be held mechanically without live air pressure, select the SAIL or BSAI locking cylinder series instead, as the SAIJ adjuster is only a stop.
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 SAIJ125X450-20S FAQ
The rear adjuster screw lets you shorten the 450 mm nominal stroke by up to 20 mm, providing a 430-450 mm travel window. It functions as a mechanical stop for end-position tuning and is not a lock.
At 0.5 MPa operating pressure, it provides 6136 N of pull force and 8590 N of push force. The maximum operating pressure is 1.0 MPa.
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