This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX325S, 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 SI100AX325S
The AirTAC Airtac SI100 Standard Cylinder SI100AX325S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 325mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX325S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX325S
- 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 SI100AX325S
The AirTAC SI100AX325S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 325mm stroke. Built with a SUS420J2 stainless piston rod (-A) and a piston magnet (-S), it delivers 3927 N push and 3681 N pull at 0.5 MPa through a G1/2 port. The direct replacement is the SAI100AX325S, which matches the exact ISO 15552 mounting interface, bore, stroke, output force, and porting.
Upgrading to the SAI100AX325S introduces a superior piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also expands capabilities with SAIL, SAIF, and BSAI lock variants the original SI lacked. If high temperatures are involved, a Viton H seal option raises the operating range to 0-150 C.
Airtac SI100 Standard Cylinder SI100AX325S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX325S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX325S |
| Bore size | Ø100 mm |
| Stroke | 325 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 SAI100AX325S 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 SAI100AX325S 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 SI100AX325S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×325 | 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 SI100AX325S Is Used
Heavy-Duty Pressing
Applies 3927 N of thrust at 0.5 MPa for seating bearings, stamping light components, or forming assemblies in automated machinery.
Pallet Diversion
Actuates heavy lane diverters or pallet stops on packaging lines, utilizing the adjustable 36mm air cushions to decelerate at stroke ends.
Replacing the Airtac SI100 Standard Cylinder SI100AX325S with the SAI100AX325S
To replace the SI100AX325S, order the SAI100AX325S. Verify your ISO 15552 mounting fixtures, the G1/2 air port, the M20x1.5 rod thread, and the CS1-B/DS1-B legacy sensors (the SAI uses current AirTAC switches). When sizing, a 100mm bore yields 3927 N push at 0.5 MPa; stepping down to an 80mm bore reduces this to 2513 N, while a 125mm bore increases it to 6136 N. Because the stroke is 325mm, use an external guide to prevent rod bending and side-load damage. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX325S
- ✓ 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 SI100AX325S FAQ
Yes, the SI100AX325S is discontinued. The direct replacement is the SAI100AX325S. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 325mm stroke, G1/2 port, and mounting interface. The SAI features an upgraded two Y-shaped one-way piston seal for longer life.
The bore is 100mm with a G1/2 air port. The thrust is 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical maximum of 801 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX325S
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