This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX250, 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 SI80BX250
The AirTAC SI80 Standard Air Cylinder SI80BX250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX250
- 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 SI80BX250
The AirTAC SI80BX250 is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 250mm stroke. Delivering 2513N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI80BX250. This direct upgrade matches the exact ISO 15552 mounting interface, bore, stroke, force, and accessories, fitting existing fixtures perfectly.
The SAI80BX250 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SI80BX250 variant uses a SUS304 stainless piston rod for corrosion resistance, but lacks a magnet so it cannot accept position switches.
Airtac SI80 Standard Air Cylinder SI80BX250 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX250 |
| Bore size | Ø80 mm |
| Stroke | 250 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 SAI80BX250 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 SAI80BX250 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 SI80BX250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SI80BX250 Is Used
Stainless Rod Clamping
Ideal for moderate washdown or corrosive clamping stations requiring the SUS304 rod option to resist moisture while delivering 2513N of push force.
Heavy Package Diversion
Provides robust actuation for diverting heavier packages on 250mm strokes, utilizing the 80mm bore's 2268N pull force to retract routing arms reliably.
Pallet Stopper Gate
Functions as a heavy-duty stop gate for pallet conveyors, dropping into existing ISO 15552 fixtures with its G3/8 port and 80mm profile barrel.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX250 with the SAI80BX250
To replace the discontinued SI80BX250, order the SAI80BX250. Verify the ISO 15552 mounting interface, 80mm bore, 250mm stroke, G3/8 port, and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the S suffix. For sizing alternatives, a 63mm bore yields 1559N push at 0.5MPa, while a 100mm bore yields 3927N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. The 250mm stroke is safe from rod-bending concerns, but always guide side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX250
- ✓ 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 SI80BX250 FAQ
Yes, the SI80BX250 is discontinued. The direct replacement is the SAI80BX250. It is dimensionally interchangeable per ISO 15552, maintaining the same 80mm bore, 250mm stroke, 2513N force, G3/8 port, and SUS304 stainless rod.
The bore is 80mm with a G3/8 air port. At 0.5MPa it pushes 2513N and pulls 2268N. At 0.7MPa push is 3518N, and at 0.9MPa push is 4523N. The theoretical maximum force is 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80BX250
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX250 replacement — usually within 7-8 hours.