Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75 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 SAIJ125X475-75
The AirTAC SAIJ125X475-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm carbon steel rod and G1/2 port. The integrated adjuster allows you to fine-tune the effective travel anywhere within a 400 to 475mm window, providing exact end-position calibration without swapping hardware.
Because this 475mm stroke is substantial, the 32mm rod diameter handles significant side loads, though an external guide remains essential for unsupported lengths. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting options span Basic, FA, LB, TC, FTC, TCM1, and TCM2. Operating speed is rated for 30-500mm/s, supported by variable air cushions at both ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75 |
|---|---|
| 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 SAIJ125X475-75
| 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 SAIJ125X475-75 Is Used
Product Changeover
Dial in the 400-475mm travel window during format size changes on a packaging line, using the rear stopper to set new end positions rapidly without changing the cylinder.
Heavy Press Positioning
Leverage the 6136N thrust at 0.5MPa to position heavy materials, relying on the 75mm adjustment to fine-tune the pressing depth at commissioning.
Long-Stroke Assembly
Execute 475mm assembly strokes where exact final contact depth varies by component tolerance, trimmed precisely via the rear screw rather than external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-75 the Right Cylinder?
Choose this 125mm bore when a 63mm bore (providing 1559N push at 0.5MPa) is insufficient for heavy positioning tasks. The 75mm adjustment range is ideal for production lines running mixed product sizes, allowing rapid changeover by dialing in a new retract stop rather than re-piping a fixed SAI cylinder. If the application requires holding a load without live air pressure, note that this adjuster acts only as a travel stop; you should specify a SAIL pneumatic lock or an external rod lock.
To achieve a true ISO 15552 replacement match, confirm the 475mm nominal stroke, the 75mm adjuster requirement, PT tapered port threads, and the required mounting accessory. Since the stroke exceeds 300mm, ensure the load is guided externally to prevent eccentric forces from damaging the rod seals.
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 SAIJ125X475-75 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the 475mm nominal stroke by up to 75mm, yielding an effective travel range of 400 to 475mm. It sets the end position but does not lock the load without live air pressure.
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