Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S
The AirTAC SAIJ125X700-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 625 to 700 mm. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa. Featuring a SUS420J2 stainless steel rod (option A) and a built-in magnet for position sensing, it uses a PT tapered G1/2 port.
This model allows operators to fine-tune the retract end-position during commissioning or product changeovers without physically swapping the cylinder. The rear adjuster acts purely as a mechanical stop to set the travel limit and is not a locking device, meaning the load requires live air pressure to remain held. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAIJ125AX700-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SAIJ125AX700-75S Is Used
Product Size Changeover
Dial in the exact retract distance within the 625-700 mm window during line changeovers to accommodate different product lengths without changing hardware.
Machine Setup Commissioning
Fine-tune the end-stop position during initial machine commissioning to perfect the mechanical timing without adding external spacers or stops.
Variable End-Stop Positioning
Adjust the travel limit on the fly for automated assembly lines that need to process varying part dimensions within the same work cell.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX700-75S the Right Cylinder?
Choose this 125 mm bore when substantial force is required, stepping up from a 100 mm bore that yields 3927 N push at 0.5 MPa, or stepping down from a 160 mm bore providing 10053 N. An adjustable stroke is ideal for machinery requiring variable end-stops or precise product-size changeovers, offering more flexibility than a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, this cylinder is insufficient; consider an external rod lock, a pilot-operated check valve, or related AirTAC types like SAIL or BSAI.
When ordering an ISO 15552 replacement, match the 125 mm bore, 700 mm stroke, 75 mm adjustment range, PT port thread, and -S magnet option. Because the 700 mm stroke is relatively long, ensure external guide rails are used to prevent excessive side-loading on the 32 mm rod, even with its M27x2 thread. The operating speed is 30-500 mm/s.
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 SAIJ125AX700-75S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 75 mm, creating a usable travel window of 625 to 700 mm. This mechanical stop fine-tunes the end position but does not lock the load without live air pressure.
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