Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100 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 SAIJ125AX300-100
The AirTAC SAIJ125X300-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. With a 300 mm nominal stroke and a 100 mm adjustment range, it provides a variable usable travel window of 200 to 300 mm. This allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it ideal for heavy-duty positioning.
This model features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting, though this specific SKU lacks a magnet and cannot host CMSE or DMSE sensors without modification. The rear adjuster acts strictly as a travel stop and works alongside the 40 mm variable air cushions at both ends to decelerate the load; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100 |
|---|---|
| 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 SAIJ125AX300-100
| 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 SAIJ125AX300-100 Is Used
Product Changeover Dials
Quickly adjust the 200-300 mm travel window during packaging format changes without disassembling the cylinder or repositioning external hard stops.
Heavy Press Positioning
Leverages the 6136 N push force at 0.5 MPa to move heavy jigs, using the rear screw to fine-tune the final press depth accurately.
Variable End-Stop Sorting
Acts as an adjustable diverter on a conveyor, allowing the 300 mm stroke to be mechanically dialed back to 200 mm for different package sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100 the Right Cylinder?
Selecting this 125 mm bore cylinder is appropriate when your application requires high force output—such as 6136 N push at 0.5 MPa—combined with variable end-stop positioning. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N push at 0.5 MPa, whereas stepping up to a 160 mm bore provides 10053 N. The 100 mm adjustment range is particularly useful for product-size changeovers on a production line, allowing operators to dial in the exact travel distance without machining new hard stops.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 300 mm stroke, PT tapered port threads, and the required mounting attachment. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options. Because the stroke is 300 mm, the 32 mm diameter rod can experience leverage forces under load; an external guide is recommended to prevent side-load damage. For applications requiring the load to be held mechanically without live air, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants, as the SAIJ adjuster is not a locking device.
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 SAIJ125AX300-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from 300 mm down to 200 mm. It is used for fine-tuning end positions at commissioning but does not lock or hold the load without continuous air pressure.
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