Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S
The AirTAC SAIJ125X450-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 8590N of push force at 0.7 MPa and features a built-in magnet for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, accepting CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection.
With a 450mm nominal stroke and a 30mm adjustment range, this SKU provides a usable travel window of 420-450mm. You can fine-tune the retract end-position at commissioning without adding external stops. The 32mm carbon steel rod and M27x2 thread provide a robust interface, though at 450mm of travel, an external guide is recommended to manage side loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125X450-30S Is Used
Product Size Changeovers
Dial in the 420-450mm retract distance during format changes on packaging lines, using the rear screw to match new product dimensions without mechanical rework.
Machine Setup Calibration
Fine-tune the end stop during initial commissioning to achieve exact positioning, absorbing mechanical tolerances directly at the cylinder.
Variable End-Stop Forming
Adjust the stroke window on heavy-duty forming presses where the material thickness or die depth requires precise 30mm end-position trimming.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30S the Right Cylinder?
Choose this 125mm bore when 80mm falls short on power, as stepping up from the 80mm bore increases push force at 0.5 MPa from 2513N to 6136N. The adjustable 420-450mm window is ideal for product changeovers, allowing you to dial in the exact retract distance on the fly instead of swapping cylinders. The PT tapered port threads ensure a tight pneumatic seal.
For any stroke of 450mm, supporting the load with an external guide rail prevents excessive rod side-loading. Remember that the rear adjuster acts only as a travel stop and the air cushion handles deceleration; neither will hold the load without live air. For true load-holding without pneumatic pressure, select the SAIL lock or BSAI clamp-lock cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and 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 SAIJ125X450-30S FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the 450mm nominal stroke by up to 30mm, creating a 420-450mm usable travel window. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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