This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX425S, 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 SI100 Standard Cylinder SI100AX425S
The AirTAC Airtac SI100 Standard Cylinder SI100AX425S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 425mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX425S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX425S
- 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 SI100 Standard Cylinder SI100AX425S
The AirTAC SI100AX425S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 425mm stroke. It delivers 3927N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI100AX425S, matching the interface, stroke, force, and mounting.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. This -A variant uses a SUS420J2 stainless rod, and the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100AX425S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX425S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX425S |
| Bore size | Ø100 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100AX425S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100AX425S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100AX425S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×425 | 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 SI100 Standard Cylinder SI100AX425S Is Used
Heavy-Duty Pressing
Ideal for applying high linear force in automated assembly lines, utilizing the 3927N push capacity at 0.5MPa for pressing bearings or riveting components securely.
Material Diversion
Suitable for actuating heavy diverter arms or sorting gates on conveyor systems, where the 425mm stroke and robust 25mm rod handle substantial lateral loads with external guides.
Replacing the Airtac SI100 Standard Cylinder SI100AX425S with the SAI100AX425S
To replace this SI100AX425S, order the SAI100AX425S. Verify the ISO 15552 mounting interface, 425mm stroke, G1/2 port, and your specific mounting accessory. The SAI family adds SAIL and BSAI lock variants for load holding, as a plain cylinder drifts without live air and its cushion only decelerates. For external load holding, use a pilot check valve. At 425mm stroke, use external guides to prevent rod bending and side loads. If sizing up or down, note the 100mm bore yields 3927N push at 0.5MPa, while the 80mm bore yields 2513N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX425S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100AX425S FAQ
Yes, the SI100AX425S is discontinued. The direct replacement is the SAI100AX425S. It is dimensionally interchangeable per ISO 15552, offering the same 100mm bore, 425mm stroke, G1/2 port, and mounting interface.
The 100mm bore provides 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a max force of 801kgf at 1.0MPa. Operating speed is 30-800mm/s. It features a 25mm rod, M20x1.5 thread, and 36mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX425S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX425S replacement — usually within 7-8 hours.