Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75
The AirTAC SAIJ125X900-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, designed to fine-tune the end position during commissioning. With a nominal 900 mm stroke and a 75 mm adjustment screw, it provides a usable travel window of 825-900 mm, allowing you to dial in the exact retract distance without adding external stops. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This model features a carbon steel piston rod and PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider an external rod lock or related types like the SAIL or BSAI cylinders.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-75 Is Used
Product Size Changeovers
Quickly reconfigure the 825-900 mm travel window on packaging lines to accommodate different carton or pallet sizes without changing the cylinder.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy assemblies, using the rear stopper to fine-tune the final resting position during machine setup.
Long-Stroke Assembly Presses
Utilize the 900 mm reach for large automated press applications, relying on the external guide to maintain stability across the extended travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-75 the Right Cylinder?
Choose this 125 mm bore when you need substantial thrust, such as the 6136 N push force at 0.5 MPa, but want to avoid stepping up to the 160 mm bore which offers 10053 N. The adjustable 825-900 mm travel window is ideal for product-size changeovers on a line, allowing you to reposition the end stop quickly rather than swapping out a fixed-stroke SAI cylinder. When matching ISO 15552 replacements, confirm the 900 mm stroke, 75 mm adjuster, PT port thread, and mounting choice.
Because this cylinder features a 900 mm stroke, the 32 mm rod diameter and M27x2 rod thread require careful alignment to manage side loads. For strokes of this length, an external guide is strongly recommended to prevent rod bending and premature seal wear. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X900-75 FAQ
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke by up to 75 mm. This creates an adjustable travel window of 825-900 mm, allowing you to fine-tune the retract position at commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 11045 N of push force at 0.9 MPa.
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