This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X55, 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 SI100X55
The AirTAC SI100 Standard Cylinder SI100X55 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 55mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X55, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X55
- 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 SI100X55
The AirTAC SI100X55 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 55mm stroke, delivering 3927N push force at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X55. The SAI upgrade is a direct: identical ISO 15552 mounting interface, stroke, output force, and port size. The new model uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor (legacy CS1-B/DS1-B switches require the magnetic piston). For load holding, note that standard cylinders drift on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI100 Standard Cylinder SI100X55 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X55 |
| Bore size | Ø100 mm |
| Stroke | 55 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 SAI100X55 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 SAI100X55 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 SI100X55
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×55 | 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 SI100X55 Is Used
Heavy-Duty Pressing
Drives large stamps and forming tools with 3927N push force at 0.5MPa, utilizing the short 55mm stroke for rapid high-impact cycles.
Pallet Diverting
Actuates heavy-duty routing gates on packaging lines, where the 100mm bore provides the necessary thrust to shift loaded pallets reliably.
Material Stops
Functions as a robust end-stop on roller conveyors, extending quickly to halt large crates before downstream sorting operations.
Replacing the Airtac SI100 Standard Cylinder SI100X55 with the SAI100X55
To replace the discontinued SI100X55, order the SAI100X55. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port thread (PT/G/NPT), and the M20x1.5 rod-end thread. Since this SKU has no -S suffix, it cannot take a sensor; if position detection is needed, order the SAI equivalent with the magnet option. The 100mm bore yields 3927N push at 0.5MPa; sizing down to an 80mm bore gives 2513N, while stepping up to 125mm provides 6136N. For load holding on air loss, the cushion only decelerates, so specify an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X55
- ✓ 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 SI100X55 FAQ
Yes, the SI100X55 is discontinued. The direct replacement is the AirTAC SAI100X55. It shares the same ISO 15552 mounting interface, 100mm bore, 55mm stroke, output force, and G1/2 port, fitting directly into existing fixtures.
It features a G1/2 air port and delivers 3927N push / 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. The rod is Ø25mm with an M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X55 replacement — usually within 7-8 hours.