This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X25S, 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 SI100X25S
The AirTAC Airtac SI100 Standard Cylinder SI100X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X25S
- 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 SI100X25S
The AirTAC SI100X25S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 25mm stroke. It delivers a push force of 3927 N at 0.5 MPa. AirTAC replaced this legacy unit with the SAI100X25S, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/2 port, and M20x1.5 rod thread.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI100 Standard Cylinder SI100X25S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X25S |
| Bore size | Ø100 mm |
| Stroke | 25 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 SAI100X25S 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 SAI100X25S 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 SI100X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×25 | 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 SI100X25S Is Used
Heavy-Duty Clamping
Secures large metal castings during CNC machining, utilizing the 3927 N push force at 0.5 MPa to prevent workpiece shifting under high cutting loads.
Pallet Diverting
Actuates heavy-duty divert arms on automated packaging lines, using the short 25mm stroke to rapidly push loaded pallets onto secondary tracks.
Gate Control
Operates robust security gates or heavy material bay doors, where the 100mm bore provides the necessary torque to overcome mechanical friction and inertia.
Replacing the Airtac SI100 Standard Cylinder SI100X25S with the SAI100X25S
To replace the SI100X25S, order the SAI100X25S and confirm the ISO 15552 mounting interface, 100mm bore, 25mm stroke, G1/2 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S suffix means a magnet is present for CS1-B/DS1-B switches; if ordering the SAI, specify the current AirTAC switch equivalent. To size both ways, a neighboring 80mm bore yields 2513 N push at 0.5 MPa, while stepping up to 125mm provides 6136 N. Note that a plain cylinder does not hold load on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X25S
- ✓ 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 SI100X25S FAQ
Yes, the AirTAC SI100X25S is discontinued and end-of-life. The direct replacement is the SAI100X25S. It features the same ISO 15552 mounting interface, 100mm bore, 25mm stroke, output force, and G1/2 port, fitting directly into existing fixtures.
The 100mm bore uses a G1/2 air port and an M20x1.5 rod thread. Force ratings are: push 3927 N and pull 3681 N at 0.5 MPa; push 5497 N at 0.7 MPa; push 7068 N at 0.9 MPa; with a theoretical maximum force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X25S replacement — usually within 7-8 hours.