Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S
The AirTAC SAIJ125X550-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 475 to 550 mm. Featuring a carbon steel rod and a -S magnet, it integrates seamlessly with CMSE reed and DMSE electronic sensors housed in the dual-side extruded aluminum barrel grooves. Delivering 6136 N of push thrust at 0.5 MPa, it is built for heavy-duty positioning tasks.
This 125 mm bore unit uses a PT G1/2 port and M27x2 rod thread. The external rear stopper allows precise end-position tuning during commissioning without swapping the cylinder. Remember that this adjuster acts strictly as a travel stop and does not hold the load without live air; for dead-pilot holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-75S Is Used
Variable End Stops
Dial in the 475-550 mm travel window on the fly to accommodate varying package lengths without changing out the entire actuator assembly.
Machine Changeover
Rear screw fine-tuning allows operators to reset the end-of-stroke position rapidly during product line transitions, minimizing downtime.
Heavy Assembly Pressing
Leverage the 6136 N push force at 0.5 MPa to seat large components securely, using the adjustable stop to control the exact pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-75S the Right Cylinder?
Choose this 125 mm bore when the 80 mm class (2513 N push at 0.5 MPa) is insufficient, or step down if the 160 mm bore (10053 N) provides excess capacity. The 75 mm adjustment range is ideal for fine-tuning variable end stops during product-size changeovers, replacing the need for fixed-stroke SAI cylinders and external mechanical stops. It supports the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) while omitting FB, CA, CB, and CR brackets.
Because the 550 mm stroke exceeds 300 mm, the unsupported piston rod is highly susceptible to side-loading and deflection. An external guide mechanism is strongly recommended to prevent premature seal wear. For drop-in replacements, match the 125 mm bore, 550 mm stroke, 75 mm adjustment, PT G1/2 port, and -S magnet requirement to ensure dimensional interchangeability per ISO 15552.
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 SAIJ125X550-75S 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 the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 550 mm stroke by up to 75 mm, creating a 475-550 mm usable travel window. It functions as a stop and does not lock the load without live air pressure.
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