Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75S 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 SAIJ125AX475-75S
The AirTAC SAIJ125X475-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and features a SUS420J2 stainless steel rod (code A) for enhanced durability against moisture. The integrated magnet (-S) supports CMSE reed and DMSE electronic sensors for precise position detection.
With a 475mm nominal stroke and a 75mm adjustment range, this model yields a usable travel window of 400 to 475mm. This built-in rear stopper allows operators to fine-tune the retract end-position during commissioning or product-size changeovers without swapping out the entire cylinder. The extruded aluminum barrel includes sensor grooves on both sides, and the PT tapered port threads ensure a tight pneumatic seal.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75S |
|---|---|
| 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 SAIJ125AX475-75S
| 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 SAIJ125AX475-75S Is Used
Machine Changeovers
Dial in the exact retract position from 400 to 475mm during product-size changeovers without bolting on external stops or replacing the cylinder.
Assembly Presses
Provides 6136N of push force at 0.5 MPa for pressing operations, with the rear screw allowing fine-tuning of the pressing depth at commissioning.
Variable End Stops
Ideal for diverter arms requiring adjustable travel limits to handle different package sizes on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75S the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires substantial thrust—up to 8590N at 0.7 MPa—alongside variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa; if your machine demands higher output, a 160mm bore provides 10053N. The adjustable stroke is ideal for flexible production lines, but remember the rear adjuster acts only as a travel stop. It does not hold the load without live air pressure; for true fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
Because the 475mm stroke creates a long unsupported rod extension, adding an external guide is recommended to prevent side-loading damage to the piston. For a direct ISO 15552 replacement, match the 125mm bore, 475mm stroke, 75mm adjustment, PT port thread, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR.
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 SAIJ125AX475-75S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operating at 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 475mm down to 400mm. This creates a 400-475mm usable window for fine-tuning the end position without replacing the cylinder.
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