This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX550, 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 SI100BX550
The AirTAC Airtac SI100 Standard Cylinder SI100BX550 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 SAI100BX550, 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 → SAI100BX550
- 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 SI100BX550
The AirTAC SI100BX550 is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 550mm stroke. Delivering 3927 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI100BX550. This direct upgrade matches the original bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU uses a SUS304 stainless steel rod (B option) and lacks a magnet, meaning it cannot accept position sensors.
Airtac SI100 Standard Cylinder SI100BX550 Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX550 |
| 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 SAI100BX550 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 SAI100BX550 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 SI100BX550
| 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 SI100BX550 Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers, utilizing the 3927 N push force to hold parts rigidly against cutting forces.
Pallet Diversion
Actuates heavy-duty diverter arms on packaging lines, where the 550mm stroke provides full lane-changing reach for oversized pallets.
Replacing the Airtac SI100 Standard Cylinder SI100BX550 with the SAI100BX550
To replace the SI100BX550, order the SAI100BX550. Verify the ISO 15552 mounting interface, the 100mm bore, the 550mm stroke, the G1/2 port, and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support Hall-effect sensors; if sensing is required, select an SAI model with the S suffix. For sizing, a 100mm bore yields 3927 N push at 0.5 MPa; dropping to an 80mm bore reduces push to 2513 N, while increasing to 125mm provides 6136 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. With a 550mm stroke, use external guides to prevent rod bending and side-load damage. The SAI family also offers the SAIF variant with a built-in 4M valve for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX550
- ✓ 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 SI100BX550 FAQ
Yes, the SI100BX550 is discontinued. The direct replacement is the AirTAC SAI100BX550. It shares the exact same ISO 15552 mounting interface, 100mm bore, 550mm stroke, force output, and G1/2 port, fitting directly into existing fixtures.
The 100mm bore features a G1/2 air port and M20x1.5 rod thread. Force output 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 of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX550 replacement — usually within 7-8 hours.