This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75S, 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 SI125X75S
The AirTAC SI125 Standard Cylinder SI125X75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X75S
- 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 SI125X75S
The AirTAC SI125X75S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 75mm stroke, delivering 6136N push force at 0.5MPa via its G1/2 port. AirTAC replaced this legacy unit with the SAI125X75S, a direct upgrade retaining the exact ISO 15552 mounting interface, M27x2 rod thread, and 40mm cushions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL and BSAI lock variants the SI lacked. Your -S suffix means a built-in magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X75S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75S |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125X75S 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 SAI125X75S 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 SI125X75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125X75S Is Used
Heavy Press Clamping
Generates 8590N of push force at 0.7MPa to secure large metal stampings or heavy machinery components during high-stress machining operations.
Injection Mold Ejection
Delivers robust 5734N pull force at 0.5MPa to reliably extract dense molded parts from industrial tooling without stalling.
Replacing the Airtac SI125 Standard Cylinder SI125X75S with the SAI125X75S
To replace the SI125X75S, order the SAI125X75S, confirming the ISO 15552 interface, 75mm stroke, G1/2 port, and mounting accessory. The -S magnet equips it for current AirTAC switches. If sizing down, a 100mm bore yields 3927N push at 0.5MPa; sizing up to 160mm provides 10053N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI lock variant. Operating speed is 30-500mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75S
- ✓ 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 SI125X75S FAQ
Yes, the SI125X75S is discontinued. The direct replacement is the AirTAC SAI125X75S. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 75mm stroke, output force, G1/2 port, and mounting fixtures.
At 0.5MPa it provides 6136N push and 5734N pull force. At 0.7MPa push is 8590N, and at 0.9MPa it is 11045N. The theoretical maximum force is 1251kgf at 1.0MPa. Operating speed for this 125mm bore is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75S replacement — usually within 7-8 hours.