This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100AX550, 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 SI100AX550
The AirTAC Airtac SI100 Standard Cylinder SI100AX550 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 550mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100AX550, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100AX550
- 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 SI100AX550
The AirTAC SI100AX550 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 550mm stroke. Delivering 3927N push force at 0.5MPa, it features a SUS420J2 stainless rod and G1/2 port. The direct replacement is the SAI100AX550, matching the interface, force, and mounting.
The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. Without a magnet, this SKU cannot take a sensor. For high heat, Viton H seals raise limits to 150C.
Airtac SI100 Standard Cylinder SI100AX550 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100AX550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100AX550 |
| Bore size | Ø100 mm |
| Stroke | 550 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 SAI100AX550 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 SAI100AX550 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 SI100AX550
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×550 | 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 SI100AX550 Is Used
Heavy Pressing
Drives 3927N at 0.5MPa for seating heavy bearings in automated assembly lines.
Pallet Diverting
Uses the 550mm stroke and SUS420J2 rod to push large pallets across transfer sections.
Replacing the Airtac SI100 Standard Cylinder SI100AX550 with the SAI100AX550
To replace this SI100AX550, order the SAI100AX550. Verify the ISO 15552 mounting interface, 100mm bore, 550mm stroke, G1/2 port, and SUS420J2 stainless rod. Sizing down, an 80mm bore yields 2513N at 0.5MPa; sizing up, a 125mm bore gives 6136N. This non-magnet SKU cannot accept a CS1-B/DS1-B sensor. Because the 550mm stroke is long, use external guides to prevent rod bending. The cushion only decelerates; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100AX550
- ✓ 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 SI100AX550 FAQ
Yes, the SI100AX550 is discontinued. The direct replacement is the AirTAC SAI100AX550. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 550mm stroke, G1/2 port, and mounting.
It features a G1/2 port. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N at 0.9MPa, and a maximum theoretical force of 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100AX550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100AX550 replacement — usually within 7-8 hours.