This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X550LB, 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 SI100X550LB
The AirTAC Airtac SI100 Standard Cylinder SI100X550LB 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 SAI100X550LB, 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 → SAI100X550LB
- 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 SI100X550LB
The AirTAC SI100X550LB is a discontinued double-acting ISO 15552 profile cylinder with an LB foot mount. Built for heavy tasks, it delivers 3927 N push force at 0.5 MPa through a 100 mm bore and 550 mm stroke. Because this legacy unit is end-of-life, order the SAI100X550LB direct replacement. It shares the exact ISO 15552 mounting interface, G1/2 port, and output force, dropping right into existing LB foot fixtures.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors. If you need load holding on air loss, the plain cylinder drifts; consider the SAIL lock or BSAI clamp-lock variants instead.
Airtac SI100 Standard Cylinder SI100X550LB Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X550LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X550LB |
| 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 SAI100X550LB 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 SAI100X550LB 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 SI100X550LB
| 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 SI100X550LB Is Used
Heavy Press Ejection
Supplies 3927 N of push force at 0.5 MPa to eject dense stamped parts from heavy press dies, utilizing the LB foot mount for rigid base fixation.
Bulk Material Diversion
Drives heavy-duty diverter arms on high-capacity conveyor lines, relying on the 36 mm adjustable air cushions to decelerate the substantial moving mass.
Replacing the Airtac SI100 Standard Cylinder SI100X550LB with the SAI100X550LB
To replace the SI100X550LB, specify the SAI100X550LB. Confirm the ISO 15552 mounting interface matches your existing LB foot brackets, and verify the 100 mm bore, 550 mm stroke, and G1/2 port. This SKU has no magnet (-S), meaning it cannot support position sensing; if you require switches, select an SAI model with the S suffix for current AirTAC sensors. For sizing, the 100 mm bore yields 3927 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N, while a 125 mm bore offers 6136 N. Because the 550 mm stroke is long, use external guides to prevent rod bending and side-load damage. Finally, a standard cylinder does not hold load without live air—the cushion only decelerates—so use a pilot check valve or explore the SAIL or BSAI lock variants for static holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X550LB
- ✓ 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 SI100X550LB FAQ
Yes, the SI100X550LB is discontinued. The direct replacement is the SAI100X550LB. It is dimensionally interchangeable per ISO 15552, retaining the same 100 mm bore, 550 mm stroke, G1/2 port, and LB foot mounting interface.
This double-acting cylinder features a G1/2 port. It generates 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 SAI100X550LB
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