Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75 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 SAIJ125AX475-75
The AirTAC SAIJ125X475-75 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, making it suitable for heavy-duty operations. By turning the rear screw, you can trim the effective travel within a 400-475 mm window, allowing precise end-position tuning during commissioning without swapping out the entire actuator.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. If you need load-holding capability without continuous live air pressure, note that this adjuster acts only as a travel stop; you should explore the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75 |
|---|---|
| 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 SAIJ125AX475-75
| 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 SAIJ125AX475-75 Is Used
Variable End Stops
Dial in the exact retract position within the 400-475 mm window during machine commissioning to accommodate different material lengths without external stopper blocks.
Product-Size Changeovers
Quickly reconfigure the stroke on production lines handling multiple product sizes, using the rear adjuster to shift the end-of-travel point by up to 75 mm.
Heavy-Duty Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or fixtures, relying on the robust 32 mm rod to handle substantial dynamic loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-75 the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when your application demands high thrust, delivering 6136N push and 5734N pull at 0.5 MPa. If your setup requires less force, stepping down to a 100 mm bore yields 3927N push force. The 75 mm adjustment range is ideal for product-size changeovers on a line, giving you a 400-475 mm usable travel window to dial in the exact retract distance on the fly, unlike a fixed-stroke SAI cylinder.
Because the 475 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread will carry significant side loads, but an external guide is still recommended to prevent rod bending over long unsupported travel. When replacing an ISO 15552 cylinder, match the 125 mm bore, 475 mm stroke, PT port threads, and your required mounting style. The SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options.
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 SAIJ125AX475-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 475 mm stroke by up to 75 mm, providing an effective adjustable travel window of 400 to 475 mm. It only sets the travel end and does not lock the load without live air.
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