This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX1000, 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 SI125AX1000
The AirTAC SI125 Standard Cylinder SI125AX1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1000mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1000 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX1000
- 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 SI125AX1000
The AirTAC SI125AX1000 is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 1000mm stroke, and a SUS420J2 stainless piston rod. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125AX1000, retaining the same interface, force, and mounting fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a CS1-B/DS1-B sensor. For load holding, the cushion only decelerates; use the SAIL lock or BSAI clamp-lock variant.
Airtac SI125 Standard Cylinder SI125AX1000 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX1000 |
| Bore size | Ø125 mm |
| Stroke | 1000 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 SAI125AX1000 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 SAI125AX1000 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 SI125AX1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1000 | 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 SI125AX1000 Is Used
Heavy Stamping Press
Drives large platens and heavy dies using 8590N output at 0.7MPa, relying on adjustable 40mm cushions to absorb impact at stroke ends.
Large Component Ejection
Ejects heavy molded parts over the 1000mm travel, requiring external guide rails to prevent rod bending during extended reach.
Replacing the Airtac SI125 Standard Cylinder SI125AX1000 with the SAI125AX1000
To replace the SI125AX1000, order the SAI125AX1000. Verify the ISO 15552 mounting interface, 1000mm stroke, G1/2 port, and your specific mounting accessory. This SKU has no magnet (-S), meaning it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position sensing is required. The SUS420J2 (-A) stainless rod resists corrosion versus standard carbon steel. Sizing both ways: a 100mm bore yields 3927N push at 0.5MPa, while a 160mm bore yields 10053N. With 8590N push at 0.7MPa, this 125mm bore fits heavy-duty applications. Because the stroke is 1000mm, prevent rod bending by using external guides to manage side loads. A plain cylinder does not hold load without air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for secure holding. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX1000
- ✓ 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 SI125AX1000 FAQ
Yes, the SI125AX1000 is discontinued. The direct replacement is the SAI125AX1000. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 1000mm stroke, G1/2 port, and mounting interface. The SAI features an upgraded piston seal for lower start-up pressure.
The G1/2 port feeds a 32mm rod. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, with a theoretical max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX1000 replacement — usually within 7-8 hours.