This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX90, 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 SI125AX90
The AirTAC SI125 Standard Cylinder SI125AX90 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 90mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX90, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX90
- 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 SI125AX90
The AirTAC SI125AX90 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 90 mm stroke, delivering 6136 N push force at 0.5 MPa. AirTAC replaced it with the SAI125AX90 direct replacement, maintaining the exact G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface. This SKU features the SUS420J2 stainless steel piston rod (A option) for corrosion resistance but lacks a magnet, meaning it cannot accept position sensors.
The SAI125AX90 upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line. Operating speed is 30-500 mm/s.
Airtac SI125 Standard Cylinder SI125AX90 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX90 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX90 |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAI125AX90 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 SAI125AX90 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 SI125AX90
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SI125AX90 Is Used
Heavy-Duty Pressing
Drives robust pressing and stamping operations requiring up to 6136 N of thrust at 0.5 MPa, utilizing the 125 mm bore for high-force metalworking tasks.
Injection Molding
Operates large mold clamps and heavy industrial doors, relying on the SUS420J2 stainless rod to resist moisture and corrosion in humid environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX90 with the SAI125AX90
To replace the discontinued SI125AX90, order the SAI125AX90 and verify your ISO 15552 mounting fixtures, G1/2 port, and M27x2 thread. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B switches; add the magnet if sensing is needed. For sizing down, an 80 mm bore yields 2513 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL lock for load holding. With a 90 mm stroke, side-load risks are minimal, but always ensure rigid alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX90
- ✓ 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 SI125AX90 FAQ
Yes, the SI125AX90 is discontinued. The direct replacement is the SAI125AX90. It shares the identical ISO 15552 mounting interface, 125 mm bore, 90 mm stroke, G1/2 port, and force ratings, fitting directly into your existing fixtures.
This 125 mm bore cylinder features a G1/2 air port. The thrust ratings are: 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX90
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX90 replacement — usually within 7-8 hours.