This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX250S, 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 SI80AX250S
The AirTAC SI80 Standard Air Cylinder SI80AX250S 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 SAI80AX250S, 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 → SAI80AX250S
- 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 SI80AX250S
The AirTAC SI80AX250S is a discontinued double-acting ISO 15552 profile cylinder with a 250 mm stroke and an 80 mm bore. It delivers 2513 N of push force at 0.5 MPa and features a SUS420J2 stainless steel piston rod for corrosion resistance. AirTAC replaced this legacy unit with the SAI80AX250S, a direct replacement retaining the exact bore, stroke, G3/8 port, M20x1.5 rod thread, and ISO 15552 mounting interface.
The SAI80AX250S upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This magnet-equipped model (-S) supports legacy CS1-B/DS1-B sensors, while the SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the original SI line.
Airtac SI80 Standard Air Cylinder SI80AX250S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX250S |
| 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 SAI80AX250S 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 SAI80AX250S 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 SI80AX250S
| 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 SI80AX250S Is Used
Machine Tool Clamping
Secures heavy metal workpieces during CNC machining using the 2513 N push force, while the SUS420J2 stainless rod resists cutting fluid splatter.
Pressing & Forming
Applies steady downward pressure for light-duty assembly and forming tasks, safely operating within the 1508 N working load margin.
Pallet Diverting
Pushes heavy pallets off a main conveyor line with a 250 mm stroke, relying on adjustable end cushions to decelerate the 80 mm bore smoothly.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX250S with the SAI80AX250S
To replace the SI80AX250S, order the SAI80AX250S and verify your ISO 15552 mounting interface, G3/8 port, and M20x1.5 thread. The -S magnet allows CS1-B/DS1-B switches (the SAI uses current AirTAC switches), and the -A rod specifies SUS420J2 stainless steel. Sizing both ways: the 80 mm bore yields 2513 N push at 0.5 MPa (or 3518 N at 0.7 MPa), while the neighboring 63 mm bore provides 1559 N at 0.5 MPa. 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 load holding. At 250 mm stroke, guide rods are advised to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX250S
- ✓ 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 SI80AX250S FAQ
Yes, the SI80AX250S is discontinued. The direct replacement is the SAI80AX250S. It features the same ISO 15552 mounting interface, 80 mm bore, 250 mm stroke, output force, G3/8 port, and accessories, fitting directly into existing fixtures.
The bore has a G3/8 air port. Force ratings are: 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 of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX250S replacement — usually within 7-8 hours.