Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100 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 SAIJ125X300-100
The AirTAC SAIJ125X300-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136 N push force at 0.5 MPa. By integrating an external stopper screw, this model allows you to trim the effective travel back by up to 100 mm, creating a highly versatile 200-300 mm usable stroke window. This fine-tuning capability is ideal for dialing in exact retract end positions during commissioning without swapping out the entire actuator.
Featuring a 32 mm carbon steel piston rod and a PT G1/2 port, this cylinder is built for heavy-duty cycles. It retains the standard extruded aluminum barrel with dual sensor grooves, though it omits the -S magnet on this configuration. The rear adjuster functions strictly as a travel stop to set the deceleration point alongside the variable air cushions, and it will not hold a load dynamically without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100 |
|---|---|
| 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 SAIJ125X300-100
| 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 SAIJ125X300-100 Is Used
Product Changeover
Redefine the 200-300 mm retract window instantly via the rear screw when switching machinery to handle a different pallet or part size.
End-Stop Calibration
Dial in the exact retract position during machine commissioning to prevent crashes, relying on the 100 mm adjustment range rather than external shims.
Heavy Forming Press
Leverage the 6136 N push force at 0.5 MPa for high-tonnage pressing tasks, using the adjustable stop to set precise bottoming depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder lacks thrust, as stepping up from the 80 mm bore increases your 0.5 MPa push force from 2513 N to 6136 N. The 100 mm adjustment range is specifically valuable for product-size changeovers on a line, allowing operators to redefine the retract distance on the fly instead of adding external mechanical stops. For any load-holding requirements without live air, this standard adjuster is not a lock, so you should evaluate the SAIL or BSAI series instead.
Because this unit features a 300 mm stroke, the extended 32 mm carbon steel rod will still require an external guide to prevent excessive side-loading and premature seal wear. To match this exact ISO 15552 footprint for a direct replacement, verify the 125 mm bore, 300 mm stroke, PT tapered G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125X300-100 FAQ
The rear adjuster acts as an external mechanical stop that lets you shorten the nominal 300 mm stroke by up to 100 mm, providing an effective travel window of 200-300 mm. It sets the end position and works with the air cushion to decelerate the load, but it does not lock the rod without live air.
At 0.5 MPa operating pressure, this double-acting cylinder provides a push force of 6136 N and a pull force of 5734 N. It can achieve a maximum push force of 11045 N at 0.7 MPa.
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