This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X330, 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 SI125X330
The AirTAC SI125 Standard Cylinder SI125X330 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 SAI125X330, 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 → SAI125X330
- 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 SI125X330
The AirTAC SI125X330 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 330 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X330, matching the exact interface, bore, stroke, force, port and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This SKU lacks a magnet, so it cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X330 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X330 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X330 |
| 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 SAI125X330 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 SAI125X330 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 SI125X330
| 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 SI125X330 Is Used
Heavy Press Forming
Ideal for driving large press dies and forming tools where the 6136 N push force at 0.5 MPa is required for shaping metal components.
Large Clamp Actuation
Secures heavy industrial workpieces in machining cells, relying on the 125 mm bore's robust clamping force over the 330 mm travel.
Replacing the Airtac SI125 Standard Cylinder SI125X330 with the SAI125X330
To replace this SI with the SAI125X330, verify the ISO 15552 mounting interface, 125 mm bore, 330 mm stroke, G1/2 port (PT/G/NPT) and mounting accessory. If sensing is needed, note this no-S SKU cannot take a magnetic switch; the legacy -S used CS1-B/DS1-B. For sizing both ways, neighbouring bores offer different force classes, but at 0.5 MPa this bore yields 6136 N push and 5734 N pull. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for holding. Because the 330 mm stroke is long, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X330
- ✓ 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 SI125X330 FAQ
Yes, the AirTAC SI125X330 is discontinued. The direct replacement is the SAI125X330. It is dimensionally interchangeable per ISO 15552, offering the same bore, stroke, force, G1/2 port and mounting interface.
At 0.5 MPa it provides 6136 N push and 5734 N pull; at 0.7 MPa push is 8590 N; at 0.9 MPa push is 11045 N. The theoretical max is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s, with a 40 mm adjustable cushion and M27x2 rod thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X330
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X330 replacement — usually within 7-8 hours.