This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X250SN, 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 SI80X250SN
The AirTAC SI80 Standard Air Cylinder SI80X250SN 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 SAI80X250SN, 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 → SAI80X250SN
- 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 SI80X250SN
The AirTAC SI80X250SN is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a built-in piston magnet. In this 80 mm bore class it delivers 2513 N of push force at 0.5 MPa through its G3/8 port, with a 250 mm stroke and M20x1.5 rod thread. The direct replacement is the current-production SAI80X250SN, which preserves the original ISO 15552 mounting interface, bore, stroke, output force, port size and mounting accessories.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. The NBR seal handles -20 to +70 C, while a Viton H option extends this to 150 C. This SI unit uses legacy CS1-B/DS1-B sensors, and the SAI family also adds SAIL, SAIF and BSAI lock variants.
Airtac SI80 Standard Air Cylinder SI80X250SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X250SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X250SN |
| 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 SAI80X250SN 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 SAI80X250SN 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 SI80X250SN
| 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 SI80X250SN Is Used
Press Fit Assembly
Drives 128 kg vertical loads to seat bearings in machining fixtures, relying on the 2513 N push force at 0.5 MPa.
Pallet Diversion
Actuates heavy lane diverters on packaging lines, utilizing the 36 mm adjustable air cushions to stop the 250 mm stroke smoothly.
Material Lift Gates
Raises and lowers ergonomic access gates on loading docks where the G3/8 port and ISO 15552 footprint fit existing brackets.
Replacing the Airtac SI80 Standard Air Cylinder SI80X250SN with the SAI80X250SN
To replace the SI80X250SN, order the SAI80X250SN direct equivalent, verifying the ISO 15552 mounting interface, 80 mm bore, 250 mm stroke, G3/8 port (PT/G/NPT thread options) and your specific mounting accessory. The -S magnet accommodates CS1-B/DS1-B switches, while the -N denotes the standard NBR seal. If you need more force, the neighboring 100 mm bore provides 3927 N push at 0.5 MPa; if less is required, the 63 mm bore offers 1559 N. Note that a plain cylinder does not hold load without live air—the cushion only decelerates—so for load holding consider the SAIL lock, BSAI clamp-lock variant, or an external pilot check valve. At 250 mm stroke, guide rails are recommended to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X250SN
- ✓ 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 SI80X250SN FAQ
Yes, the SI80X250SN is discontinued. The direct replacement is the SAI80X250SN. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 250 mm stroke, 2513 N force, G3/8 port and mounting interface.
The 80 mm bore uses a G3/8 port. It generates 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 maximum force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X250SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X250SN replacement — usually within 7-8 hours.