This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX250, 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 SI100AX250
The AirTAC SI100 Standard Cylinder SI100AX250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX250
- 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 SI100AX250
The AirTAC SI100AX250 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 250mm stroke. Delivering 3927 N push force at 0.5 MPa through a G1/2 port, it is replaced by the SAI100AX250. This direct upgrade shares identical ISO 15552 mounting dimensions, bore, stroke and output force, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SI100AX250 variant uses a SUS420J2 stainless steel rod (A suffix) for corrosion resistance. As a no-magnet SKU, it cannot accept a sensor.
Airtac SI100 Standard Cylinder SI100AX250 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX250 |
| Bore size | Ø100 mm |
| Stroke | 250 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 SAI100AX250 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 SAI100AX250 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 SI100AX250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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 SI100AX250 Is Used
Heavy-Duty Pressing
Applies the 5497 N push force at 0.7 MPa to seat bearings and assemble heavy mechanical components securely.
Diversion Gates
Actuates large routing flaps on high-capacity conveyors, utilizing the robust 25mm piston rod for structural support.
Replacing the Airtac SI100 Standard Cylinder SI100AX250 with the SAI100AX250
To replace the discontinued SI100AX250, order the SAI100AX250. Verify the ISO 15552 mounting interface, 100mm bore, 250mm stroke, G1/2 port (PT/G/NPT thread options) and your specific mounting accessory. Because this is a no-SKU without a magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the S suffix for current AirTAC switches. Sizing both ways: the 100mm bore yields 3927 N push at 0.5 MPa (80mm gives 2513 N; 125mm gives 6136 N). A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 250mm stroke, side-load is minimal, but ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX250
- ✓ 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 SI100AX250 FAQ
Yes, the AirTAC SI100AX250 is discontinued. The direct replacement is the SAI100AX250. It is dimensionally interchangeable per ISO 15552, retaining the same 100mm bore, 250mm stroke, G1/2 port, output force and mounting interface.
This 100mm bore cylinder features a G1/2 air port and M20x1.5 rod thread. 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 force of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX250
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX250 replacement — usually within 7-8 hours.