Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75
The AirTAC SAIJ125X450-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 450mm nominal stroke by up to 75mm for a highly flexible 375-450mm usable travel window. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and utilizes PT tapered port threads with a G1/2 port size. Delivering robust performance, it generates 6136N of pull force at 0.5MPa and 8590N at 0.7MPa.
Because the adjuster acts purely as a mechanical stop at the retract end and works alongside the 40mm air cushion, it decelerates the travel but does not lock the load without live air. For position holding without pneumatic pressure, you would need to specify a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead. This model supports speeds of 30-500mm/s and uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-75 Is Used
Machine Setup Changeovers
Fine-tune the 375-450mm retract end-position during product line changeovers without physically replacing the cylinder or adding external mechanical stops.
Variable End-Stop Tuning
Dial in the exact end-of-stroke position during commissioning using the rear 75mm adjuster screw to perfectly accommodate varying workpiece sizes.
Heavy-Duty Positioning
Leverage the 8590N push force at 0.7MPa to move heavy pallets or fixtures, relying on the rear stop to set the precise retract distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-75 the Right Cylinder?
Choose this 125mm bore when you need high thrust combined with variable end-position tuning during machine commissioning or product-size changeovers. If your application requires less force, stepping down to a 100mm bore yields 3681N of pull force at 0.5MPa, but the 125mm bore is necessary for heavier loads requiring up to 6136N. The adjustable stroke is ideal when you need a variable end-stop without swapping the entire cylinder or bolting on external stops.
As an ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders. To match this exact replacement, specify a 125mm bore, 450mm stroke, 75mm adjustment range, PT port threads, SUS420J2 rod material, and no magnet. Since the stroke is 450mm, an external guide is recommended to prevent excessive side-loading on the 32mm piston rod during extended travel.
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 SAIJ125AX450-75 FAQ
The rear adjusting screw acts as a mechanical stopper that lets you shorten the effective stroke by up to 75mm, providing a 375-450mm usable travel window. It sets the end position and works with the air cushion for deceleration, but it does not lock or hold the load without continuous live air pressure.
At 0.5MPa, this 125mm bore cylinder provides 6136N of pull force and 8590N at 0.7MPa. It can achieve a maximum thrust of 1251kgf at 1.0MPa.
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