Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30 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 SAIJ125X475-30
The AirTAC SAIJ125X475-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel to a precise 445-475 mm window. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy loads with a 32 mm carbon steel rod and M27x2 thread. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE or DMSE switches if needed.
This model uses a PT tapered port thread (G1/2) and operates at speeds between 30-500 mm/s. The rear stopper screw lets you dial in the exact retract position during commissioning without adding external stops. Remember that this adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30 |
|---|---|
| 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 SAIJ125X475-30
| 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 SAIJ125X475-30 Is Used
Product Changeover
Quickly adapt the retract distance for different sized parts on the same line without physically replacing the cylinder.
End-Position Tuning
Dial in the exact 445-475 mm travel window during commissioning to perfect machine timing and avoid hard mechanical crashes.
Heavy Forming Setup
Leverage the 6136 N push force for heavy pressing tasks while retaining the flexibility to adjust the stroke limit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-30 the Right Cylinder?
Choose this 125 mm bore when you need significantly more thrust than the 80 mm bore provides, stepping up from 2513 N to 6136 N at 0.5 MPa. The adjustable stroke is ideal for machine setups requiring variable end-stops or frequent product-size changeovers, saving the cost of swapping a fixed-stroke SAI cylinder. To match this ISO 15552 replacement exactly, confirm the 475 mm stroke, 30 mm adjustment, PT port, and mounting choice.
Because this cylinder features a 475 mm stroke, the extended 32 mm rod will experience leverage forces under side-loading. Always pair it with an external guide to prevent binding and premature seal wear. For applications requiring the load to be held mechanically without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ rear adjuster is strictly a stop, not a lock.
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 SAIJ125X475-30 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the nominal 475 mm stroke by up to 30 mm, creating a usable travel window of 445-475 mm. This stopper sets the end position but does not lock the load without live air pressure.
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