Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20
The AirTAC SAIJ125X75-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 6136N push force at 0.5 MPa and allows you to dial back the 75mm nominal stroke by up to 20mm, creating a precise 55-75mm usable travel window for exact end-position tuning. This eliminates the need to swap components or bolt on external stops during machine commissioning.
Equipped with a SUS420J2 stainless steel rod and a PT tapered port thread, this model handles robust industrial demands. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The rear adjuster acts purely as a travel stop for deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125AX75-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125AX75-20 Is Used
Machine Setup Calibration
Fine-tune the 55-75mm travel window during initial commissioning to perfectly strike a workpiece without machining custom spacers.
Product Size Changeovers
Quickly adjust the end-stop by up to 20mm when a production line switches to a different product height or thickness.
Heavy-Duty Positioning
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or fixtures into their final rear position accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-20 the Right Cylinder?
Choose this 125mm bore when you need substantial thrust—6136N at 0.5 MPa or 8590N at 0.7 MPa. If your application requires less force, stepping down to an 80mm bore yields 2513N at 0.5 MPa, while a 160mm bore provides 10053N for heavier loads. The adjustable stroke is selected over a fixed SAI cylinder when setups require variable end-stops or frequent product changeovers.
Because the stroke is 75mm, side-load risks are minimal, but always ensure proper alignment. For load-holding without continuous air pressure, this cylinder is insufficient; you should select an SAIL for pneumatic locking or a BSAI for clamp-locking. To replace this unit, match the 125mm bore, 75mm stroke, 20mm adjust, PT port, and mounting hardware.
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 SAIJ125AX75-20 FAQ
At an operating pressure of 0.5 MPa, this 125mm bore cylinder delivers 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the 75mm nominal stroke by up to 20mm, providing a usable travel window of 55-75mm. The adjuster serves as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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