This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX425S, 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 SI100BX425S
The AirTAC Airtac SI100 Standard Cylinder SI100BX425S 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 SAI100BX425S, 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 → SAI100BX425S
- 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 SI100BX425S
The AirTAC SI100BX425S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore, 425mm stroke, and SUS304 stainless piston rod. Delivering 3927N push force at 0.5MPa, it is replaced directly by the SAI100BX425S. This direct successor shares the exact G1/2 port, M20x1.5 thread, and 36mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100BX425S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX425S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX425S |
| 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 SAI100BX425S 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 SAI100BX425S 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 SI100BX425S
| 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 SI100BX425S Is Used
Large Press Ejection
Provides the 3927N push at 0.5MPa needed to eject heavy stamped parts from a press bed, utilizing the 425mm stroke to clear the die area completely.
Heavy Product Diverting
Actuates large diverter arms on packaging lines, using the G1/2 port volume and 30-800mm/s speed range to move bulky goods between conveyor belts.
Replacing the Airtac SI100 Standard Cylinder SI100BX425S with the SAI100BX425S
To replace this SI100BX425S with the SAI100BX425S, verify the ISO 15552 mounting interface, 425mm stroke, G1/2 port, and mounting accessory. The -S magnet supports legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If downsizing, a 80mm bore yields 2513N push at 0.5MPa; if upsizing, a 125mm bore yields 6136N. Note: a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or SAIL/BSAI variant. At 425mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX425S
- ✓ 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 SI100BX425S FAQ
Yes, the SI100BX425S is discontinued. The direct replacement is the SAI100BX425S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 425mm stroke, G1/2 port, and mounting interface, so it fits existing fixtures directly.
It features a G1/2 air port. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. The rod is 25mm with an M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX425S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX425S replacement — usually within 7-8 hours.