This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X635S, 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 SI80X635S
The AirTAC SI80 Standard Air Cylinder SI80X635S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 635mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X635S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke635 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X635S
- 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 SI80X635S
The AirTAC SI80X635S is a discontinued double-acting ISO 15552 profile cylinder with a 635 mm stroke. It delivers 2513 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI80X635S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI80 Standard Air Cylinder SI80X635S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X635S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X635S |
| Bore size | Ø80 mm |
| Stroke | 635 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 SAI80X635S 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 SAI80X635S 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 SI80X635S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×635 | 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 SI80X635S Is Used
Long-Stroke Diversion
Pushes heavy pallets laterally across transfer lines using the full 635 mm travel with 2513 N force.
Elevated Gate Actuation
Opens and closes tall material handling gates where the 80 mm bore and long stroke are required.
Replacing the Airtac SI80 Standard Air Cylinder SI80X635S with the SAI80X635S
To replace the SI80X635S, order the SAI80X635S. Confirm the ISO 15552 mounting accessory (LB, FA, TC) and the G3/8 port match your manifold. The SAI uses current AirTAC switches for the -S magnet, replacing legacy CS1-B/DS1-B sensors. A plain cylinder drifts without live air; for load holding use an external pilot check valve or the SAIL/BSAI lock variant. At 635 mm stroke, prevent rod bending by guiding the load externally. Sizing both ways: a 63 mm bore gives 1559 N [email protected], while a 100 mm bore yields 3927 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X635S
- ✓ 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 SI80X635S FAQ
Yes, the SI80X635S is discontinued. The direct replacement is the SAI80X635S. It shares the same ISO 15552 mounting interface, 80 mm bore, 635 mm stroke, output force and G3/8 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G3/8 air port. It generates 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a theoretical maximum force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X635S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X635S replacement — usually within 7-8 hours.