Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75S 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 SAIJ125X450-75S
The AirTAC SAIJ125X450-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 450mm nominal stroke that can be fine-tuned down by up to 75mm, yielding a usable travel window of 375-450mm. This built-in adjustability allows operators to dial in exact end positions during commissioning without adding external stops.
This model includes a magnetic piston (-S) for position sensing via CMSE reed or DMSE electronic switches. It uses a PT tapered port and a robust 32mm carbon steel rod with an M27x2 thread. The extruded aluminum barrel incorporates sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75S |
|---|---|
| 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 SAIJ125X450-75S
| 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 SAIJ125X450-75S Is Used
Product Changeovers
Quickly shift the end position by up to 75mm when running different product sizes on the same line, avoiding physical cylinder swaps.
Heavy Pressing
Delivers 6136N of thrust at 0.5 MPa for firmly seating or pressing heavy components, with fine-tuning to prevent over-travel.
Machine Setup
Dial in the exact 375-450mm travel window during initial commissioning to perfect mechanical timing without machining external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-75S the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust (6136N push at 0.5 MPa) alongside variable end-stop positioning. If your setup needs less force, stepping down to a 100mm bore provides 3927N push force. The adjustable stroke is perfect for product changeovers, but note that the rear screw acts only as a travel stop; it will not hold the load without live air. For secure load-holding, consider an external rod lock or the AirTAC SAIL series.
Because this cylinder features a 450mm stroke, the 32mm rod needs external guiding to prevent excessive side-loading and premature seal wear. To match this ISO 15552 interchangeable cylinder exactly, specify: 125mm bore, 450mm stroke, 75mm adjustment, PT G1/2 port, and the required mounting bracket.
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 SAIJ125X450-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the 450mm nominal stroke by up to 75mm. This creates a usable travel window of 375-450mm for fine-tuning end positions without changing the cylinder.
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