This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX25, 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 SI100AX25
The AirTAC Airtac SI100 Standard Cylinder SI100AX25 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 SAI100AX25, 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 → SAI100AX25
- 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 SI100AX25
The AirTAC SI100AX25 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 25mm stroke. Built with an extruded aluminum barrel, it delivers 3927 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100AX25, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, and force ratings.
The SAI100AX25 features an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SI SKU lacks the -S magnet suffix, it cannot accept a magnetic switch. The SAI family also introduces variants the original SI lacked, such as the SAIL air-released lock and BSAI clamp-lock.
Airtac SI100 Standard Cylinder SI100AX25 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX25 |
| 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 SAI100AX25 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 SAI100AX25 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 SI100AX25
| 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 SI100AX25 Is Used
Heavy-Duty Pressing
Applies 3927 N of thrust at 0.5 MPa for seating bearings or stamping components in automated machinery.
Pallet Diversion
Short 25mm stroke actuates heavy diverters or stops on high-throughput material handling lines.
Gate Control
Reliable short-stroke movement for opening and closing heavy bulk material discharge gates.
Replacing the Airtac SI100 Standard Cylinder SI100AX25 with the SAI100AX25
To replace the discontinued SI100AX25, order the SAI100AX25. It drops directly into existing fixtures via the identical ISO 15552 mounting interface, preserving the 100mm bore, 25mm stroke, G1/2 port, and M20x1.5 rod thread. When sizing, note the 100mm bore yields 3927 N push at 0.5 MPa; if less force is needed, an 80mm bore provides 2513 N. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors. A plain cylinder drifts on air loss, so for load holding use an external pilot check valve or the SAIL/BSAI lock variant. The default carbon steel rod can be swapped for SUS420J2 stainless if corrosion resistance is required.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX25
- ✓ 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 SI100AX25 FAQ
Yes, the AirTAC SI100AX25 is discontinued. The direct replacement is the SAI100AX25, which shares the identical ISO 15552 mounting interface, 100mm bore, 25mm stroke, and G1/2 port.
This double-acting cylinder uses a G1/2 air port. It generates 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, and 7068 N push 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 SAI100AX25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX25 replacement — usually within 7-8 hours.