Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 475mm 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
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50
The AirTAC SAIJ125X475-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 425 to 475 mm, allowing you to dial back the nominal 475 mm stroke by up to 50 mm during commissioning. This bore size delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-load handling.
This configuration includes a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement. While it lacks a standard piston magnet, the adjustable rear stopper enables precise end-position tuning without adding external physical stops to your machine frame.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 475 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 SAIJ125AX475-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SAIJ125AX475-50 Is Used
Variable End-Stop Positioning
Dial in the exact extend position within a 425-475 mm window during machine setup, perfect for accommodating slight variations in workpiece dimensions without mechanical rebuilds.
Product Changeover Systems
Quickly adjust the stroke end-position by up to 50 mm when switching a production line to a different product size, reducing downtime and eliminating the need for external stopper hardware.
Heavy-Duty Forming Operations
Leverage the 6136 N pull force at 0.5 MPa for pressing or forming tasks, using the rear stopper to precisely control the final bottoming position of the tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust, such as 8590 N push force at 0.7 MPa, combined with variable end-stop positioning. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N push at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier demands. The integrated 50 mm adjustment range is ideal for product changeovers where the exact extend position needs fine-tuning on the fly.
Because the 475 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the M27x2 rod thread. Remember that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure. For true load-holding without air, consider the SAIL or BSAI series instead. This model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX475-50 FAQ
The rear adjuster acts as an external mechanical stop that limits the piston's travel. For the SAIJ125X475-50, this creates a usable stroke window of 425 to 475 mm. You can fine-tune the exact end position during commissioning without changing the cylinder or adding external stops.
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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