Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10
The AirTAC SAIJ125X300-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the retract end position during commissioning. It provides a usable travel window of 290-300 mm, letting you dial back the 300 mm nominal stroke by up to 10 mm without swapping the unit or adding external stops. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy positioning tasks with ease.
This 125 mm bore profile cylinder features a robust 32 mm carbon steel rod and M27x2 rod thread to manage high side loads, though long 300 mm strokes still require an external guide for optimal support. It uses PT tapered ports (G1/2) and supports a speed range of 30-500 mm/s. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-10 Is Used
Machine Setup & Changeover
Dial in the exact retract position within the 290-300 mm window during product changeovers, eliminating the need to machine new stopper blocks.
Variable End-Stop Positioning
Fine-tune the end-of-stroke contact point on heavy conveyor diverters by adjusting the rear screw, accommodating varying package sizes on the fly.
Heavy Assembly Press
Leverage the 8590 N push force at 0.5 MPa for heavy-duty assembly presses, using the 10 mm adjustment to set precise clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10 the Right Cylinder?
Select this 125 mm bore model when your application requires substantial force, yielding 6136 N pull or 8590 N push at 0.5 MPa. If your setup needs less force, stepping down to a 100 mm bore provides 3681 N pull at 0.5 MPa. The adjustable stroke is ideal for product-size changeovers on a line, offering a 10 mm end-position tuning window that a fixed-stroke SAI cannot match. To replace an ISO 15552 cylinder, match the 125 mm bore, 300 mm stroke, PT port, and mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is 300 mm, ensure an external guide supports the load to prevent rod bending.
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 SAIJ125X300-10 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 8590 N and a pull force of 6136 N. At 0.7 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 300 mm nominal stroke down to 290 mm. It fine-tunes the end position but does not lock the load without live air pressure.
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