This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X253SN, 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 SI80X253SN
The AirTAC SI80 Standard Air Cylinder SI80X253SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 253mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X253SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke253 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X253SN
- 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 SI80X253SN
The AirTAC SI80X253SN is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a 253 mm stroke. Generating 2513 N of push force at 0.5 MPa through its G3/8 port, it is replaced by the SAI80X253SN. This direct successor shares identical mounting dimensions, bore, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SI80X253SN unit includes a piston magnet for CS1-B/DS1-B switches and an NBR seal (-N) rated for -20 to +70 C. For load holding, note that cushions only decelerate; use SAIL or BSAI lock variants.
Airtac SI80 Standard Air Cylinder SI80X253SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X253SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X253SN |
| Bore size | Ø80 mm |
| Stroke | 253 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 SAI80X253SN 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 SAI80X253SN 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 SI80X253SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×253 | 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 SI80X253SN Is Used
Package Diversion
Pushes heavy cartons on packaging lines using 2513 N of thrust, with the 253 mm stroke clearing conveyor frames.
Pallet Stopper
Acts as a robust pneumatic stop for inbound pallets, absorbing kinetic energy via adjustable 36 mm air cushions.
Press Ejection
Ejects formed metal parts from press beds, relying on the 128 kg vertical lift capacity and NBR seals.
Replacing the Airtac SI80 Standard Air Cylinder SI80X253SN with the SAI80X253SN
To replace the SI80X253SN, order the SAI80X253SN. Verify the ISO 15552 mounting interface, 80 mm bore, 253 mm stroke, G3/8 port, and M20x1.5 rod thread. Retain your original mounting accessory and PT/G/NPT thread preference. The built-in magnet (-S) accommodates CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches. The NBR seal (-N) supports -20 to +70 C; choose Viton H for up to 150 C. For sizing, a 63 mm bore yields 1559 N push at 0.5 MPa, whereas a 100 mm bore yields 3927 N. At 253 mm stroke, ensure guide alignment to prevent rod bending side-loads. Remember, a plain cylinder drifts without air; for held loads, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X253SN
- ✓ 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 SI80X253SN FAQ
Yes, the SI80X253SN is discontinued. The direct replacement is the SAI80X253SN. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 253 mm stroke, G3/8 port, and mounting fixtures.
The G3/8 port feeds a 25 mm rod generating 2513 N push and 2268 N pull at 0.5 MPa. At 0.7 MPa push is 3518 N, and 4523 N at 0.9 MPa. The theoretical max force is 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X253SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X253SN replacement — usually within 7-8 hours.