Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75S 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 SAIJ125X300-75S
The AirTAC SAIJ125X300-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N pull force at 0.5 MPa. By incorporating a 75mm adjustment mechanism, this model transforms a standard 300mm stroke into a highly versatile 225-300mm usable travel window. This built-in adjustability allows operators to fine-tune end positions precisely during commissioning or product changeovers without swapping out the entire actuator.
It features a carbon steel piston rod and PT tapered port threads, operating at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, and because this SKU includes a magnet (-S), it is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state sensors. Mounting options cover the SAIJ-specific set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75S |
|---|---|
| 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 SAIJ125X300-75S
| 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 SAIJ125X300-75S Is Used
Product Size Changeovers
Dial in the 225-300mm travel window during format changeovers on packaging lines without physically replacing the actuator or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract stroke endpoint at commissioning to absorb mechanical tolerances and ensure precise positioning of large fixtures.
Heavy-Duty End Stops
Leverage the 6136N pull force at 0.5 MPa for heavy material handling, using the rear screw to set exact retraction limits safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-75S the Right Cylinder?
Choose this 125mm bore when your application requires higher thrust than the 80mm option (which provides 2268N pull at 0.5 MPa) but does not need the full 9425N pull of the 160mm size. The 75mm adjustable stroke is selected over a fixed SAI cylinder when a machine handles multiple product sizes, allowing the retract end-stop to be dialed in on the fly. At 300mm of nominal travel, the 32mm rod diameter handles substantial loads, but for long unsupported strokes, an external guide is recommended to prevent excessive side-loading.
This unit is dimensionally interchangeable per ISO 15552 mounting interfaces. Configuration details: 125mm bore, 300mm stroke, 75mm adjustment, PT port threads, carbon steel rod, and -S magnet. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
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 SAIJ125X300-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. It can deliver a maximum push force of 11045N at 0.9 MPa.
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 75mm. This turns the fixed 300mm stroke into a 225-300mm adjustable travel window, though it only stops the piston and does not lock the load without live air pressure.
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