This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X330S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X330S
The AirTAC SI125 Standard Cylinder SI125X330S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 330mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X330S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke330 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X330S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125X330S
The AirTAC SI125X330S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 330 mm stroke. Generating 6136 N push force at 0.5 MPa, it is replaced directly by the SAI125X330S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread, fitting existing fixtures seamlessly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL and BSAI lock variants absent in the legacy line. This SI-S model supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI125 Standard Cylinder SI125X330S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X330S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X330S |
| Bore size | Ø125 mm |
| Stroke | 330 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X330S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI125X330S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X330S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×330 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X330S Is Used
Heavy Pressing
Applies 6136 N at 0.5 MPa for seating heavy bearings and forming robust components on automated lines.
Pallet Diverting
Drives large-scale pallet stops and routing gates using the 330 mm stroke and 125 mm bore power.
Replacing the Airtac SI125 Standard Cylinder SI125X330S with the SAI125X330S
To replace the SI125X330S, order the SAI125X330S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the -S magnet requirement. The SAI matches the 125 mm bore, 330 mm stroke, and 11045 N push at 0.9 MPa. If you need less force, step down to an 80 mm bore (2513 N push at 0.5 MPa); for more, the 160 mm bore yields 10053 N. Note that a 330 mm stroke requires external guides to prevent rod bending under side loads. A plain cylinder drifts without air; for load holding, use the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X330S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X330S FAQ
Yes, the SI125X330S is discontinued. The direct replacement is the SAI125X330S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 330 mm stroke, G1/2 port, and mounting interface.
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s, with a 40 mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X330S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X330S replacement — usually within 7-8 hours.