Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40
The AirTAC SAIJ125X90-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 90 mm stroke by up to 40 mm. This creates a usable travel window of 50-90 mm, allowing exact end-position tuning at commissioning without swapping hardware. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod for superior corrosion resistance and uses PT tapered port threads for a robust mechanical seal. The extruded aluminum barrel includes sensor grooves on both sides, ready for electronic DMSE or reed CMSE switches if a magnet is added later. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125AX90-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125AX90-40 Is Used
Machine Changeover
Quickly reconfigure the stroke end-point from 90 mm down to 50 mm when switching product sizes on a packaging line, eliminating the need to install external physical stops.
Heavy Pressing
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the fine adjustment to dial in the exact contact depth without over-traveling.
Assembly Station Tuning
Perfectly tune the retraction end position during initial commissioning to align a large gripper, relying on the SUS420J2 rod to resist washdown moisture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-40 the Right Cylinder?
Selecting this 125 mm bore cylinder provides 6136 N of push thrust at 0.5 MPa, stepping up significantly from the 80 mm bore which yields 2513 N. The adjustable 50-90 mm travel window is ideal for machinery that requires variable end-stops during product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. When matching ISO 15552 replacements, verify the 90 mm stroke, 40 mm adjustment range, PT G1/2 port, and the SUS420J2 rod material.
Because the stroke is 90 mm, side-load risks are minimal, though long unsupported strokes still need an external guide. Remember that the rear adjuster only sets the travel end; for fail-safe load holding without live air, consider an external rod lock or the AirTAC SAIL and BSAI series. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, 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 SAIJ125AX90-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that can shorten the 90 mm stroke by up to 40 mm, giving a usable travel window of 50-90 mm. It only sets the travel end and does not lock the load without continuous air pressure.
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