This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX260, 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 SI125AX260
The AirTAC SI125 Standard Cylinder SI125AX260 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 260mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX260, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke260 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX260
- 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 SI125AX260
The AirTAC SI125AX260 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 260 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a G1/2 port, M27x2 rod thread, and 40 mm adjustable air cushions. The direct replacement is the current-production SAI125AX260, which shares the exact same interface, force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This SI unit has a SUS420J2 stainless rod (-A) but lacks a magnet, meaning it cannot accept position switches. For load holding, note that standard cylinders drift on air loss; use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI125 Standard Cylinder SI125AX260 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX260 |
| Bore size | Ø125 mm |
| Stroke | 260 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 SAI125AX260 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 SAI125AX260 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 SI125AX260
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×260 | 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 SI125AX260 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring high thrust, utilizing the 6136 N push force at 0.5 MPa to form thick metal components reliably.
Injection Mold Clamp
Secures large injection molding fixtures, relying on the SUS420J2 stainless rod to resist corrosion in humid production environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX260 with the SAI125AX260
To replace the SI125AX260, order the SAI125AX260. Verify the ISO 15552 mounting interface, the 125 mm bore, the 260 mm stroke, the G1/2 port, and your specific mounting accessories. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; if sensing is needed, specify a magnet on the SAI order. At 0.5 MPa, this bore yields 6136 N push and 5734 pull force; if sizing down, a 100 mm bore provides 3927 N push. For load holding on air loss, the cushion only decelerates; add an external pilot check valve or choose the SAIL or BSAI lock variant. For the 260 mm stroke, ensure adequate guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX260
- ✓ 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 SI125AX260 FAQ
Yes, the AirTAC SI125AX260 is discontinued. The direct replacement is the SAI125AX260. It is dimensionally interchangeable per ISO 15552, maintaining the same 125 mm bore, 260 mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder operates at 30-500 mm/s. Force output is 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 max of 1251 kgf at 1.0 MPa. The G1/2 port is fixed by the 125 mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX260 replacement — usually within 7-8 hours.