Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30S 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 SAIJ125X475-30S
The AirTAC SAIJ125X475-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of thrust at 0.5 MPa, utilizing a 32mm carbon steel rod and PT G1/2 tapered port. Because this SKU carries the -S option, it includes a built-in magnet for position sensing with AirTAC CMSE reed or DMSE electronic switches.
The integrated stopper screw trims the nominal 475mm travel back by up to 30mm, creating a precise 445-475mm usable window. This allows you to fine-tune the retract end-position during commissioning or product changeovers without swapping the cylinder or adding external stops. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30S |
|---|---|
| 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 SAIJ125X475-30S
| 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 SAIJ125X475-30S Is Used
Product Changeover
Dial in the exact retract distance within the 445-475mm window when switching packaging sizes on a line, eliminating the need for physical spacer changes.
Machine Setup Tuning
Fine-tune the end-of-stroke position during commissioning to align heavy press tools perfectly without machining new mounting plates.
Variable End Stops
Adjust the travel limit on the fly for heavy-duty material bending or forming operations that require slight positional shifts between batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30S the Right Cylinder?
Choose this 125mm bore when your application requires substantial force, stepping up from a 100mm cylinder that provides 3927N at 0.5 MPa. The adjustable 445-475mm stroke is ideal for variable end-stops on heavy machinery, whereas a fixed-stroke SAI is better suited for rigid, non-changeover setups. If your process requires load-holding without continuous air pressure, pair this cylinder with an external pilot-operated check valve or select the BSAI clamp-lock series instead.
As an ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO 15552 mounting interfaces. It uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 475mm stroke is relatively long, the 32mm rod diameter provides good rigidity, but an external guide is recommended to prevent excessive side-loading on unsupported loads.
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 SAIJ125X475-30S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
The rear adjuster screw acts as a mechanical stop that shortens the 475mm nominal stroke by up to 30mm, providing a usable travel window of 445-475mm. It only sets the end position and does not lock or hold the load without live air.
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