Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-30 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 SAIJ125AX475-30
The AirTAC SAIJ125X475-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 445 to 475 mm usable travel window by dialing back the nominal 475 mm stroke up to 30 mm, enabling precise end-position tuning during commissioning without swapping hardware. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa operating pressure.
This unit uses a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU lacks a magnet for position detection. The rear adjuster acts strictly as a travel stop to set deceleration and end-points; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-30 |
|---|---|
| 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 SAIJ125AX475-30
| 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 SAIJ125AX475-30 Is Used
Machine Changeover
Dial in the 445-475 mm end-stop during product size transitions without physically replacing the cylinder or adding external shims.
End-Position Tuning
Fine-tune the final retract position at commissioning to absorb mechanical tolerances and achieve exact positioning.
Variable End-Stops
Set custom travel limits on automated lines where multiple end-positions are required for different process steps.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-30 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires the 6136 N thrust at 0.5 MPa, stepping up from an 80 mm bore that provides 2513 N. The adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops for machine setup or product changeover. To replace this ISO 15552 cylinder, match the 125 mm bore, 475 mm stroke, 30 mm adjustment, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits the FB, CA, CB, and CR mounts.
Because the 475 mm stroke exceeds 300 mm, the 32 mm rod diameter and M27x2 thread will experience amplified side loads; an external guide rail is recommended to prevent binding. For load-holding without continuous air pressure, the rear stop is insufficient—consider the SAIL pneumatic lock or BSAI clamp-lock cylinder instead. Operating speed is 30-500 mm/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 SAIJ125AX475-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw lets you shorten the effective travel from 475 mm down to 445 mm. It functions as a mechanical stop to set the end-position and deceleration, but it does not lock or hold the load without live air pressure.
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