This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80AX250, 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 SI80AX250
The AirTAC SI80 Standard Air Cylinder SI80AX250 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 SAI80AX250, 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 → SAI80AX250
- 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 SI80AX250
The AirTAC SI80AX250 is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 250mm stroke. It delivers 2513N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI80AX250, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SI80AX250 SKU uses an SUS420J2 stainless steel rod (the -A option) rather than standard carbon steel, but lacks a magnet so it cannot accept position sensors.
The SAI family also introduces SAIL, SAIF and BSAI variants that the SI line lacked. Note that a plain cylinder drifts on air loss; the 36mm adjustable air cushions only decelerate near stroke ends, so use an external rod lock or pilot check valve for load holding.
Airtac SI80 Standard Air Cylinder SI80AX250 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80AX250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80AX250 |
| 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 SAI80AX250 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 SAI80AX250 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 SI80AX250
| 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 SI80AX250 Is Used
Clamping Fixtures
Secures heavy metal components during machining using the 2513N push force, with the SUS420J2 stainless rod resisting coolant corrosion.
Package Diverters
Drives medium-duty sorting arms on packaging lines where the 250mm stroke provides adequate reach to redirect goods.
Pallet Stops
Acts as a robust pneumatic stop gate for pallet accumulation, relying on the 80mm bore to halt moving loads smoothly.
Replacing the Airtac SI80 Standard Air Cylinder SI80AX250 with the SAI80AX250
To replace the discontinued SI80AX250, order the SAI80AX250. Verify your ISO 15552 mounting interface (LB, FA, FB, CA, CB, TC, etc.), the 250mm stroke, and the G3/8 port. This SKU has the -A stainless SUS420J2 rod and no magnet (-S), meaning it cannot accept CS1-B or DS1-B sensors; if sensing is needed, specify an SAI80X250S. If sizing up or down, neighbouring bores are 63mm (1559N push @0.5MPa) and 100mm (3927N push @0.5MPa). Because the 250mm stroke is under the 300mm side-load threshold, standard mounting is fine, but always guide the load to prevent rod bending. For applications requiring load holding on air loss, upgrade to the SAIL or BSAI lock variant, or add a pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80AX250
- ✓ 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 SI80AX250 FAQ
Yes, the SI80AX250 is discontinued. The direct replacement is the SAI80AX250. It shares the exact ISO 15552 mounting interface, 80mm bore, 250mm stroke, output force, G3/8 port and accessories, fitting directly into existing fixtures.
The bore is 80mm with a G3/8 port. Force ratings are: 2513N push and 2268N pull at 0.5MPa; 3518N push at 0.7MPa; 4523N push at 0.9MPa; and a theoretical max of 513 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80AX250
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80AX250 replacement — usually within 7-8 hours.