This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X290, 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 SI125X290
The AirTAC SI125 Standard Cylinder SI125X290 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 290mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X290, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X290
- 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 SI125X290
The AirTAC SI125X290 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 290mm stroke, delivering 6136N push force at 0.5MPa. The direct replacement is the SAI125X290, retaining the exact G1/2 port, M27x2 thread, and mounting interface.
This SKU lacks a magnet and cannot accept position sensors. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. For load holding, use SAIL or BSAI variants.
Airtac SI125 Standard Cylinder SI125X290 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X290 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X290 |
| Bore size | Ø125 mm |
| Stroke | 290 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 SAI125X290 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 SAI125X290 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 SI125X290
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×290 | 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 SI125X290 Is Used
Heavy Press Operations
Drives 6136N of thrust at 0.5MPa for actuating large forming presses and heavy-duty stamping fixtures.
Bulk Material Diversion
Shifts heavy bulk material diverters and heavy-gauge routing gates on high-capacity conveyor lines.
Replacing the Airtac SI125 Standard Cylinder SI125X290 with the SAI125X290
To replace the SI125X290, order the SAI125X290 with the identical ISO 15552 mounting interface, 125mm bore, 290mm stroke, G1/2 port, and matching accessory. Confirm thread options (PT/G/NPT) and rod material (carbon, SUS420J2 A, or SUS304 B). Because this SKU has no -S magnet, it cannot take CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. At 290mm stroke, guide side-loads to prevent rod bending. Neighbouring bores: 100mm offers 3927N [email protected]; 160mm offers 10053N. The plain cylinder drifts on air loss—use an external rod lock, pilot check valve, or SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X290
- ✓ 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 SI125X290 FAQ
Yes, the SI125X290 is discontinued. The direct replacement is the SAI125X290, which is dimensionally interchangeable per ISO 15552 with the same bore, stroke, force, G1/2 port, and mounting.
It features a G1/2 port. Force ratings are: push 6136N and pull 5734N at 0.5MPa, push 8590N at 0.7MPa, push 11045N at 0.9MPa, and a maximum theoretical force of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X290
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X290 replacement — usually within 7-8 hours.