This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX180STC, 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 SI80BX180STC
The AirTAC SI80 Standard Air Cylinder SI80BX180STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 180mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX180STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke180 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX180STC
- 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 SI80BX180STC
The AirTAC SI80BX180STC is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 180mm stroke. It delivers 2513N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI80BX180STC, which shares identical mounting, force, and port specs. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. This unit has a SUS304 stainless rod (-B) and a magnet (-S) for CS1-B/DS1-B sensors.
The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock or pilot check valve. The Viton H seal option raises the temperature limit to 150C.
Airtac SI80 Standard Air Cylinder SI80BX180STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX180STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX180STC |
| Bore size | Ø80 mm |
| Stroke | 180 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 SAI80BX180STC 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 SAI80BX180STC 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 SI80BX180STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×180 | 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 SI80BX180STC Is Used
Machine Tool Clamping
Secures heavy cast iron fixtures on CNC machining centers using the 2513N push force and TC trunnion mount to accommodate slight frame misalignment.
Pallet Diversion
Actuates heavy-duty lane diverters for loaded pallets, relying on the SUS304 stainless rod to resist coolant and washdown moisture in packaging lines.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX180STC with the SAI80BX180STC
To replace the SI80BX180STC, order the SAI80BX180STC. It is a direct per the ISO 15552 mounting interface, matching the 80mm bore, 180mm stroke, G3/8 port, TC trunnion mount, and -S magnet. Retain your CS1-B/DS1-B sensors, though the SAI family uses current AirTAC switches. The -B option specifies a SUS304 stainless rod for corrosion resistance. If sizing up or down, neighbouring bores are 63mm (1559N push @0.5MPa) and 100mm (3927N push @0.5MPa). For load holding on air loss, a plain cylinder drifts; the cushion only decelerates. Specify an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The 180mm stroke is under the 300mm side-load threshold, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX180STC
- ✓ 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 SI80BX180STC FAQ
Yes, the SI80BX180STC is discontinued. The direct replacement is the SAI80BX180STC. It matches the ISO 15552 mounting interface, 80mm bore, 180mm stroke, output force, G3/8 port, and TC mounting so it fits existing fixtures directly.
This double-acting cylinder has a G3/8 port. The force ratings are: 2513N push and 2268N pull at 0.5MPa, 3518N push at 0.7MPa, 4523N push at 0.9MPa, and a theoretical maximum of 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX180STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX180STC replacement — usually within 7-8 hours.