Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20S 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 SAIJ125AX450-20S
The AirTAC SAIJ125X450-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 8590N push force at 0.7 MPa, utilizing a 32mm SUS420J2 stainless steel rod. The built-in -S magnet supports CMSE reed and DMSE electronic sensors via dual-side barrel grooves.
This specific SKU provides a 450mm nominal stroke that can be fine-tuned backward by up to 20mm, creating a 430-450mm usable travel window. This allows precise end-position calibration during commissioning without swapping the cylinder or adding external stops. The rear adjuster acts strictly as a travel stop to set the end position, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20S |
|---|---|
| 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 SAIJ125AX450-20S
| 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 SAIJ125AX450-20S Is Used
Product Changeover Setup
Dial in the 430-450mm travel window during line changeovers to accommodate different product lengths without physically replacing the actuator.
Heavy Forming End-Stop
Leverage the 8590N push force at 0.7 MPa for pressing operations, using the rear screw to fine-tune the exact bottoming position.
Variable Position Ejection
Adjust the retraction end-point on the fly to eject parts of varying sizes from a machining center.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-20S the Right Cylinder?
Select this 125mm bore cylinder when your machine requires heavy thrust (6136N at 0.5 MPa) and on-site stroke tuning. If your application needs less force, stepping down to the 100mm bore yields 5497N at 0.7 MPa. Choose the adjustable SAIJ over a fixed SAI when you need a variable end-stop for product changeovers.
Because the 450mm stroke is long, the 32mm rod and M27x2 thread provide strong support, but an external guide is recommended to prevent excessive side-loading. For exact ISO 15552 interchangeability, match the 125mm bore, 450mm stroke, 20mm adjustment, PT tapered ports, and -S magnet. If your machine requires load-holding without live air pressure, use a SAIL or BSAI cylinder 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 SAIJ125AX450-20S FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can deliver a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 450mm nominal stroke by up to 20mm, providing a usable travel window of 430-450mm. This stopper sets the end position but does not lock the load without live air pressure.
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