This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X575, 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 SI125X575
The AirTAC SI125 Standard Cylinder SI125X575 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 575mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X575, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke575 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X575
- 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 SI125X575
The AirTAC SI125X575 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 575 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X575, matching the exact bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features 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; legacy CS1-B/DS1-B switches require the -S version.
Airtac SI125 Standard Cylinder SI125X575 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X575 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X575 |
| Bore size | Ø125 mm |
| Stroke | 575 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 SAI125X575 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 SAI125X575 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 SI125X575
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×575 | 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 SI125X575 Is Used
Heavy Stamping Press
Drives large platens and stamping dies requiring 6136 N push force at 0.5 MPa, utilizing the 575 mm stroke to clear bulky tooling.
Large Component Ejection
Ejects heavy molded or machined parts from large fixtures, relying on the 125 mm bore's 1251 kgf max theoretical output.
Replacing the Airtac SI125 Standard Cylinder SI125X575 with the SAI125X575
To replace the SI125X575, order the SAI125X575. Verify the ISO 15552 mounting interface, 575 mm stroke, G1/2 port (PT/G/NPT thread), M27x2 rod thread and mounting accessory. This non-magnet version cannot accept a sensor; order the SAI125X575S if CS1-B/DS1-B sensing is needed. Neighbouring bores: SI100X575 gives 3927 N push @0.5 MPa, while SI160X575 yields 10053 N. With a 575 mm stroke, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X575
- ✓ 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 SI125X575 FAQ
Yes, the SI125X575 is discontinued. The direct replacement is the AirTAC SAI125X575. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 575 mm stroke, G1/2 port, and mounting interface.
The G1/2 port bore provides 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 1251 kgf max force at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X575
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X575 replacement — usually within 7-8 hours.