Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30
The AirTAC SAIJ125X425-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 395 to 425 mm. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy-duty positioning while allowing you to dial in the exact retract distance during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a PT tapered G1/2 port and a robust 32 mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The rear stopper functions purely as a travel limiter and deceleration point, not a load-holding brake; for position retention without live air pressure, an external pilot-operated check valve or a dedicated SAIL locking cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125X425-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125X425-30 Is Used
Variable End-Stop Positioning
Ideal for heavy machinery requiring exact retract distances, letting operators dial back the stroke by up to 30 mm to accommodate different material thicknesses without changing the cylinder.
Product Changeover Systems
Perfect for automated lines handling varying package sizes, where the 395-425 mm adjustable travel window allows quick reconfiguration of pushing distances during line setup.
Heavy-Duty Machine Setup
Provides the 6136 N pull force needed for clamping or forming large components, while the rear adjuster allows fine-tuning of the end position during initial equipment commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30 the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust—such as 8590 N push at 0.7 MPa—beyond the 5497 N push capacity of a 100 mm cylinder, but less than the 14074 N push generated by a 160 mm unit. The 30 mm adjustment range is ideal for product changeovers where the precise end-of-stroke position varies slightly, eliminating the need to physically swap out a fixed-stroke SAI cylinder or bolt on external stops.
When specifying this ISO 15552 interchangeable cylinder, confirm the 425 mm stroke, 30 mm adjustment, PT port thread, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 425 mm stroke is relatively long, an external guide rail is highly recommended to prevent rod deflection and premature seal wear. The standard carbon steel rod is suitable for general industrial environments.
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 SAIJ125X425-30 FAQ
The rear adjuster screw allows you to shorten the nominal 425 mm stroke by up to 30 mm, providing an effective travel window of 395 to 425 mm. It acts as a mechanical stop to fine-tune the end position without altering the cylinder itself.
At 0.5 MPa operating pressure, it generates 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 1251 kgf.
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Standard models usually ship in 3-4 days.
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