This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X570, 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 SI125X570
The AirTAC SI125 Standard Cylinder SI125X570 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 570mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X570, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke570 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X570
- 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 SI125X570
The AirTAC SI125X570 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 570 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X570, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S), so it cannot take a CS1-B/DS1-B sensor. For high heat, Viton H seals raise the -20 to +70 C range to 150 C.
Airtac SI125 Standard Cylinder SI125X570 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X570 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X570 |
| Bore size | Ø125 mm |
| Stroke | 570 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 SAI125X570 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 SAI125X570 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 SI125X570
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×570 | 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 SI125X570 Is Used
Heavy Pressing
Applies 6136 N at 0.5 MPa for seating heavy components and forming operations in automated lines.
Pallet Lifting
Drives long 570 mm lift stages for vertical elevation, requiring external guides to prevent rod bending.
Large Clamp Actuation
Secures oversized workpieces in machining fixtures, relying on the 125 mm bore for high clamping force.
Replacing the Airtac SI125 Standard Cylinder SI125X570 with the SAI125X570
To replace the SI125X570, order the SAI125X570 and confirm the ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread. Because this 570 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage. Sizing both ways: the 125 mm bore gives 6136 N push at 0.5 MPa (1251 kgf max at 1.0 MPa); dropping to an 80 mm bore drops force to 2513 N. This non-magnet SKU cannot accept a sensor. The cushion only decelerates; it does not hold load on air loss. For held loads, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X570
- ✓ 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 SI125X570 FAQ
Yes, the SI125X570 is discontinued. The direct replacement is the AirTAC SAI125X570. It shares the identical ISO 15552 mounting interface, 125 mm bore, 570 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port bore delivers 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 maximum theoretical force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X570
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X570 replacement — usually within 7-8 hours.