This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX650S, 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 SI80 Standard Air Cylinder SI80BX650S
The AirTAC SI80 Standard Air Cylinder SI80BX650S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 650mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX650S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX650S
- 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 SI80 Standard Air Cylinder SI80BX650S
The AirTAC SI80BX650S is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore, 650mm stroke, and a SUS304 stainless steel rod. It delivers 2513 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI80BX650S, matching the bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and Viton H seals can raise the operating temperature to 150 C.
Airtac SI80 Standard Air Cylinder SI80BX650S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX650S |
| Bore size | Ø80 mm |
| Stroke | 650 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 SAI80BX650S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80BX650S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80BX650S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×650 | 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 SI80 Standard Air Cylinder SI80BX650S Is Used
Long-Stroke Diversion
Ideal for pushing heavy pallets off a main conveyor line over a 650mm reach, utilizing the 2513 N push force at 0.5 MPa to overcome friction.
Material Lowering
Suitable for lowering components into wash tanks, where the SUS304 stainless rod resists moisture and the adjustable cushion decelerates the 650mm descent.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX650S with the SAI80BX650S
To replace the SI80BX650S, order the SAI80BX650S. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G3/8 port threads, and the M20x1.5 rod end. Because this unit has the -B SUS304 rod, ensure you specify the stainless option on the SAI if corrosion resistance is required. The -S magnet allows use of current AirTAC switches (replacing legacy CS1-B/DS1-B).
Sizing both ways: the 80mm bore yields 2513 N push at 0.5 MPa; stepping down to a 63mm bore drops force to 1559 N, while stepping up to 100mm increases it to 3927 N. A plain cylinder does not hold load without live air—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 650mm stroke, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX650S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80BX650S FAQ
Yes, the SI80BX650S is discontinued. The direct replacement is the SAI80BX650S. It is dimensionally interchangeable per ISO 15552, retaining the same 80mm bore, 650mm stroke, 2513 N force, G3/8 port, and mounting interface. You simply order the SAI equivalent.
The 80mm bore features a G3/8 air port and M20x1.5 rod thread. It delivers 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max force of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX650S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX650S replacement — usually within 7-8 hours.