Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40
The AirTAC SAIJ125X800-40 is a double-acting ISO 15552 profile cylinder engineered with a rear stroke adjuster, providing a usable travel window of 760 to 800 mm. Delivering 6136 N of push force at 0.5 MPa, this extruded aluminum barrel design operates efficiently between 30 and 500 mm/s. It features a 32 mm carbon steel piston rod and a PT tapered G1/2 port.
Rather than relying on fixed stops, the external adjusting screw allows you to fine-tune the retract end position during commissioning without swapping the cylinder. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125X800-40 Is Used
Heavy Automation Changeover
Dial in the 760-800 mm travel window during product family transitions on large assembly lines without adding external physical stops.
End-Position Tuning
Fine-tune the retract end-stop at machine commissioning to achieve exact positioning of heavy 6136 N loads using the rear adjuster screw.
Material Handling Setup
Adjust the stroke on the fly for varying package sizes on long-stroke conveying systems operating safely within the 30-500 mm/s speed range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-40 the Right Cylinder?
Selecting this 125 mm bore over the smaller 100 mm variant steps your thrust up significantly from 3927 N to 6136 N at 0.5 MPa, making it suitable for heavier actuation tasks. The 40 mm adjustment range is ideal for product-size changeovers on a line, offering precise end-position tuning where a fixed-stroke SAI cylinder would require mechanical spacers. To match this ISO 15552 interchangeable cylinder, confirm your port is PT G1/2, mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2), and that no magnet is required since -S is not specified.
Because this model features an 800 mm stroke, the 32 mm carbon steel rod requires external guiding to prevent excessive side-loading and premature seal wear over long unsupported distances. The rod thread is M27x2, providing a robust interface for your mechanical attachments.
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 SAIJ125X800-40 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 a maximum 1.0 MPa, the push force reaches 1251 kgf.
The rear adjusting screw acts as a mechanical stop that lets you trim the effective travel back by up to 40 mm, creating a 760-800 mm usable stroke window. It only sets the travel end and does not lock the load without live air pressure.
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