Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20 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 SAIJ125X450-20
The AirTAC SAIJ125X450-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 6136N push force at 0.5 MPa and a usable travel window of 430 to 450 mm, letting you dial back the stroke by up to 20 mm. This built-in adjustability simplifies commissioning and product changeovers without swapping the cylinder or adding external stops.
The 125 mm bore utilizes a G1/2 port and a robust 32 mm carbon steel rod with an M27x2 thread, handling substantial side loads. It supports mounting options including Basic, FA, LB, TC, FTC, TCM1, and TCM2. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches, though this specific SKU is configured without a magnet.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20 |
|---|---|
| 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 SAIJ125X450-20
| 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 SAIJ125X450-20 Is Used
Machine Setup & Changeover
Fine-tune the 430-450 mm travel window during commissioning to dial in exact retract positions without machining new hard stops.
Variable Product Diverter
Adjust the retract distance on the fly to handle different package sizes moving down a high-thrust sorting line.
Heavy-Duty Pressing
Leverage the 6136N push force at 0.5 MPa for pressing assemblies, using the rear stopper to set precise material deformation limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-20 the Right Cylinder?
Choose this 125 mm bore when your application requires high force and exact end-position tuning; step down to a 100 mm bore if you only need 3927N at 0.5 MPa. The rear adjuster acts purely as a mechanical stop to set the travel end, not as a lock. For load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder. Because the 450 mm stroke is substantial, always use an external guide to prevent rod bending under heavy side loads.
This model is dimensionally interchangeable per ISO 15552. To match this exact configuration, specify a 125 mm bore, 450 mm stroke, 20 mm adjustment, PT tapered ports, carbon steel rod, and no magnet.
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 SAIJ125X450-20 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. It can deliver up to 8590N at 0.7 MPa.
The rear adjuster screw lets you mechanically shorten the 450 mm nominal stroke by up to 20 mm, providing a usable travel window of 430 to 450 mm. It functions as a travel stop and does not lock the load without live air.
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