This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75, 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 SI125X75
The AirTAC SI125 Standard Cylinder SI125X75 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 SAI125X75, 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 → SAI125X75
- 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 SI125X75
The AirTAC SI125X75 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 75mm stroke. Delivering 6136N push and 5734N pull at 0.5MPa, it features a 32mm rod, M27x2 thread, and a G1/2 port. The direct replacement is the SAI125X75, which matches the exact ISO 15552 mounting interface, force, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor, and plain cylinders drift without air; explore SAIL or BSAI lock variants for holding.
Airtac SI125 Standard Cylinder SI125X75 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75 |
| 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 SAI125X75 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 SAI125X75 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 SI125X75
| 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 SI125X75 Is Used
Heavy Press Clamping
Applies the 8590N push force at 0.7MPa to secure large metal castings or heavy plates during machining and stamping operations.
Bulk Material Diversion
Actuates heavy-duty diverter arms on high-capacity conveyor lines, relying on the robust 32mm rod to withstand side-loading.
Replacing the Airtac SI125 Standard Cylinder SI125X75 with the SAI125X75
To replace the SI125X75, order the SAI125X75 direct equivalent, confirming the ISO 15552 interface, 75mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor; if position detection is needed, select a magnet-equipped SAI model. For sizing alternatives, a neighbouring 100mm bore yields 3927N push at 0.5MPa, while a 160mm bore provides 10053N. Remember that a standard cylinder does not hold load on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variants for suspended loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75
- ✓ 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 SI125X75 FAQ
Yes, the AirTAC SI125X75 is discontinued and end-of-life. The direct replacement is the SAI125X75. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 75mm stroke, 6136N force, G1/2 port, and mounting fixtures.
This double-acting cylinder has a G1/2 port and delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75 replacement — usually within 7-8 hours.