Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S
The AirTAC SAIJ125X120-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 45 to 120 mm. It delivers a robust 6136N of push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This specific configuration features a SUS420J2 stainless steel rod (code A) and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the rear stopper allows precise end-position tuning without adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-75S Is Used
Variable End Stops
Dial in the exact 45 to 120mm travel window during machine commissioning to accommodate varying material thicknesses without swapping out the entire cylinder body.
Product Changeover
Rapidly adjust the retract end-position on packaging lines when switching between different package sizes, relying on the 6136N of thrust to move heavy actuators.
Heavy-Duty Setup
Leverage the 125mm bore force and the SUS420J2 stainless steel rod to handle robust positioning tasks in harsh industrial environments while fine-tuning the stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-75S the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust, such as 6136N push at 0.5MPa, combined with a highly variable travel window of 45-120mm for frequent product changeovers. If you need less force, stepping down to an 80mm bore yields 2513N, whereas moving up to a 160mm bore provides 10053N.
The rear adjuster acts solely as a travel stop to decelerate the load, not as a lock. For load-holding without live air pressure, select the SAIL or BSAI series instead. When replacing an ISO 15552 cylinder, match the 125mm bore, 120mm stroke, PT tapered ports, and the -S magnet option. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX120-75S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At a maximum 1.0 MPa operating pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that shortens the nominal 120mm stroke by up to 75mm, creating a usable travel window of 45 to 120mm. It decelerates the travel end but does not lock the load without live air.
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