Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30S 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 SAIJ125X120-30S
The AirTAC SAIJ125X120-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 120mm nominal stroke that can be dialed back by up to 30mm, creating a precise 90-120mm usable travel window for product changeovers.
This variant includes a built-in magnet for CMSE reed and DMSE electronic sensors, utilizing PT tapered ports and a robust 32mm carbon steel rod. The extruded aluminum barrel maintains standard ISO 15552 mounting dimensions while omitting the FB, CA, CB, and CR bracket options in favor of the Basic, FA, LB, TC, FTC, TCM1, and TCM2 set.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30S |
|---|---|
| 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 SAIJ125X120-30S
| 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 SAIJ125X120-30S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 90-120mm window during machine commissioning to accommodate different material thicknesses without swapping hardware.
Product Size Changeover
Quickly adjust the rear stopper by up to 30mm on packaging lines handling varying carton dimensions, leveraging the 6136N thrust for heavy pushing tasks.
Heavy Assembly Pressing
Utilize the robust 32mm carbon steel rod and high force output to press components securely, using the DMSE electronic sensors to confirm end-of-stroke positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-30S the Right Cylinder?
Select this 125mm bore when an application requires heavy thrust—such as 6136N push at 0.5 MPa—along with variable end-stop positioning during setup. If your force requirements are lower, stepping down to a 100mm bore yields 3927N push force, whereas upgrading to a 160mm bore provides 10053N. The adjustable stroke is ideal for fine-tuning retraction without adding external stops, though the rear screw acts only as a travel stop and will not hold the load without live air (consider SAIL or BSAI for locking needs).
Because the 120mm stroke is under the 300mm threshold, side-load stress is minimal, but the 32mm rod thread still requires alignment to prevent premature seal wear. To match this ISO 15552 cylinder exactly, specify the 125mm bore, 120mm stroke, 30mm adjustment, PT ports, and the -S magnet option.
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 SAIJ125X120-30S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 120mm nominal stroke by up to 30mm, providing a usable travel range of 90-120mm. This stopper only limits the travel end and does not lock the load without continuous air pressure.
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