This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X425S, 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 SI100X425S
The AirTAC Airtac SI100 Standard Cylinder SI100X425S 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 SAI100X425S, 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 → SAI100X425S
- 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 SI100X425S
The AirTAC SI100X425S is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a built-in magnet. In this 100mm bore class it delivers 3927N push and 3681N pull at 0.5MPa, operating through a G1/2 port with a 25mm rod. AirTAC replaced the SI family with the SAI100X425S, a direct upgrade retaining the exact ISO 15552 mounting interface, 425mm stroke, force class and accessories.
The SAI successor introduces an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended service life. Beyond the standard replacement, the SAI line adds SAIL air-released lock, SAIF integrated 4M valve and BSAI clamp-lock variants absent from the legacy SI range. For position sensing, this -S model accommodates legacy CS1-B/DS1-B switches, while the SAI accepts current AirTAC sensors.
Airtac SI100 Standard Cylinder SI100X425S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X425S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X425S |
| 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 SAI100X425S 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 SAI100X425S 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 SI100X425S
| 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 SI100X425S Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 3927N push force at 0.5MPa to hold components rigidly against cutting forces.
Pallet Diverting
Actuates heavy-duty diverter arms on high-throughput packaging lines, moving loaded pallets reliably with a 425mm stroke and 200kg vertical lift capability.
Automated Gate Control
Drives large access doors and safety gates on automated storage systems, requiring the robust 100mm bore and G1/2 air supply for rapid 30-800mm/s cycling.
Replacing the Airtac SI100 Standard Cylinder SI100X425S with the SAI100X425S
To replace the SI100X425S, order the SAI100X425S and verify your ISO 15552 mounting accessory (LB, FA, CA, TC), the G1/2 port thread (PT, G or NPT) and the piston magnet. If downsizing is possible, an 80mm bore yields 2513N push at 0.5MPa; if more force is needed, a 125mm bore provides 6136N. Note that a plain cylinder drifts on air loss since the air cushion only decelerates near stroke end, so use an external rod lock, pilot check valve or the SAIL/BSAI lock variant for held loads. With a 425mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X425S
- ✓ 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 SI100X425S FAQ
Yes, the AirTAC SI100X425S is discontinued and end-of-life. The direct replacement is the SAI100X425S. It features the same ISO 15552 mounting interface, 100mm bore, 425mm stroke, output force and G1/2 port, dropping directly into existing fixtures.
This double-acting cylinder uses a G1/2 port and delivers 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, and 7068N push at 0.9MPa. The theoretical maximum force is 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X425S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X425S replacement — usually within 7-8 hours.