Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40S 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 SAIJ125X475-40S
The AirTAC SAIJ125X475-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 475 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a precise 435-475 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it fits heavy-duty positioning tasks perfectly.
This variant includes a magnet for position sensing and uses a PT tapered port thread. The extruded aluminum barrel features sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches exactly where needed. The rear adjuster acts strictly as a travel stop for end-position tuning, not a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40S |
|---|---|
| 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 SAIJ125X475-40S
| 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 SAIJ125X475-40S Is Used
Product Changeovers
Dial in the 435-475 mm travel window during format changes on packaging lines, avoiding mechanical rebuilds when product sizes shift.
Heavy Press Fitment
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear stopper to guarantee precise final positioning without over-travel.
Machine Setup Tuning
Fine-tune the end-stop during initial commissioning to perfectly align large jigs, utilizing the integrated magnet for DMSE sensor feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40S the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust, such as the 6136 N push force at 0.5 MPa, but also demands on-the-fly end-position tuning without swapping cylinders. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N; if you need more power, a 160 mm bore provides 10053 N. Because the stroke is 475 mm, an external guide is recommended to prevent excessive rod side-loading.
The 40 mm adjustment window is ideal for product-size changeovers on a line, replacing the need to bolt on external stops. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 125 mm bore, 475 mm stroke, PT port, carbon steel rod, and -S magnet. Remember that the adjuster only sets the travel end; for load-holding without live air, use an external rod lock or explore AirTAC SAIL or BSAI series.
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 SAIJ125X475-40S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 40 mm. This creates a 435-475 mm usable stroke window, letting you fine-tune the end position at commissioning without adding external stops.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push force at 0.9 MPa.
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