This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX70, 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 SI125AX70
The AirTAC SI125 Standard Cylinder SI125AX70 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 70mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX70, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX70
- 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 SI125AX70
The AirTAC SI125AX70 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 70 mm stroke. It delivers 6136 N push and 5734 N pull force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125AX70, which shares the exact same ISO 15552 mounting interface, M27x2 rod thread, and 40 mm cushions.
This SKU features a SUS420J2 stainless steel rod (A suffix) but lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. The SAI upgrade utilizes two Y-shaped one-way piston seals for lower start-up pressure.
Airtac SI125 Standard Cylinder SI125AX70 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX70 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX70 |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAI125AX70 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 SAI125AX70 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 SI125AX70
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SI125AX70 Is Used
Heavy Stamping Press
Drives large stamping dies requiring high force, utilizing the 6136 N push at 0.5 MPa to form thick metal components reliably.
Pallet Dispenser
Indexes heavy wooden pallets in automated distribution lines, taking advantage of the robust 125 mm bore and SUS420J2 stainless rod.
Replacing the Airtac SI125 Standard Cylinder SI125AX70 with the SAI125AX70
To replace this discontinued SI125AX70, order the SAI125AX70. Verify your ISO 15552 mounting fixtures, the G1/2 air port, and the 70 mm stroke. Because this specific SKU has no magnet (-S), it cannot support position sensing; if you require switches, select an SAI125X70S and use current AirTAC sensors. If your application needs load holding on air loss, note that the standard cushion only decelerates; you must add an external pilot check valve or choose the SAIL or BSAI lock variant. Operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX70
- ✓ 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 SI125AX70 FAQ
Yes, the SI125AX70 is discontinued. The direct replacement is the SAI125AX70. It is dimensionally interchangeable per ISO 15552, maintaining the same 125 mm bore, 70 mm stroke, output force, G1/2 port, and mounting accessories.
This double-acting cylinder uses a G1/2 port. It generates 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 SAI125AX70
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX70 replacement — usually within 7-8 hours.