This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX75, 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 SI125AX75
The AirTAC SI125 Standard Cylinder SI125AX75 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 SAI125AX75, 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 → SAI125AX75
- 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 SI125AX75
The AirTAC SI125AX75 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 75mm stroke. It delivers 6136N push and 5734N pull at 0.5MPa via a G1/2 port. The direct replacement is the SAI125AX75, which maintains the exact ISO 15552 mounting interface, force, and stroke.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The -A suffix indicates a SUS420J2 stainless piston rod for corrosion resistance. Without a -S suffix, this SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125AX75 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX75 |
| 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 SAI125AX75 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 SAI125AX75 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 SI125AX75
| 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 SI125AX75 Is Used
Heavy Stamping
Provides 6136N of thrust at 0.5MPa for actuating large presses and forming dies.
Pallet Handling
Drives robust 75mm stroke lifting and positioning arms for heavy industrial pallets.
Mold Clamping
Secures heavy injection molds using the SUS420J2 stainless rod in humid environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX75 with the SAI125AX75
To replace the SI125AX75, order the SAI125AX75 and confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/2 port, and 75mm stroke. This non-magnetic SKU cannot accept CS1-B/DS1-B switches. Sizing both ways: a 100mm bore yields 3927N [email protected], while a 160mm bore yields 10053N. The cushion only decelerates; it does not hold load on air loss. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX75
- ✓ 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 SI125AX75 FAQ
Yes, the SI125AX75 is discontinued. The direct replacement is the SAI125AX75. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 75mm stroke, force, and G1/2 port.
It features a G1/2 port. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX75 replacement — usually within 7-8 hours.