This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX550S, 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 SI100BX550S
The AirTAC Airtac SI100 Standard Cylinder SI100BX550S 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 SAI100BX550S, 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 → SAI100BX550S
- 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 SI100BX550S
The AirTAC SI100BX550S is a discontinued double-acting ISO 15552 profile cylinder with a 100 mm bore, 550 mm stroke, and SUS304 stainless steel rod. It delivers a push force of 3927 N and pull of 3681 N at 0.5 MPa. The direct replacement is the SAI100BX550S, retaining the same G1/2 port, M20x1.5 thread, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI100 Standard Cylinder SI100BX550S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX550S |
| 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 SAI100BX550S 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 SAI100BX550S 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 SI100BX550S
| 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 SI100BX550S Is Used
Large Press Ejection
Provides the robust 3927 N push force needed to eject heavy stamped parts from large press beds, with the 550 mm stroke reaching deep into the tooling.
Pallet Discharge
Ideal for pushing loaded pallets off high-capacity roller conveyors, utilizing the SUS304 rod for corrosion resistance in humid washdown environments.
Replacing the Airtac SI100 Standard Cylinder SI100BX550S with the SAI100BX550S
To replace the SI100BX550S, order the SAI100BX550S. Confirm the ISO 15552 mounting interface, the 100 mm bore, 550 mm stroke, G1/2 port, and your specific mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet supports CS1-B/DS1-B switches. If sizing both ways, neighbor bores are 80 mm (2513 N push @0.5 MPa) and 125 mm (6136 N push @0.5 MPa). For this 550 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX550S
- ✓ 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 SI100BX550S FAQ
Yes, the SI100BX550S is discontinued. The direct replacement is the SAI100BX550S. It is dimensionally interchangeable per ISO 15552, keeping the same 100 mm bore, 550 mm stroke, G1/2 port, and mounting interface.
It features a G1/2 port, M20x1.5 rod thread, and 36 mm cushions. 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 max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX550S replacement — usually within 7-8 hours.