This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X420S, 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 SI80X420S
The AirTAC SI80 Standard Air Cylinder SI80X420S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 420mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X420S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke420 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X420S
- 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 SI80X420S
The AirTAC SI80X420S is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 420mm stroke. It delivers 2513N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI80X420S, matching the exact ISO 15552 mounting interface, stroke and output force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family also adds SAIL lock, SAIF valve and BSAI clamp variants the SI lacked.
Airtac SI80 Standard Air Cylinder SI80X420S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X420S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X420S |
| Bore size | Ø80 mm |
| Stroke | 420 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 SAI80X420S 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 SAI80X420S 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 SI80X420S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×420 | 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 SI80X420S Is Used
Pallet Diversion
Actuates heavy lane diverters on packaging lines, using the 420mm stroke to shift pallets smoothly between parallel conveyor belts.
Vertical Lift Gate
Raises and lowers 100kg access gates in automated storage systems, safely operating within the 128kg vertical lift capacity.
Press Ejection
Ejects formed metal parts from hydraulic presses, relying on the 2513N push force at 0.5MPa to clear heavy billets.
Replacing the Airtac SI80 Standard Air Cylinder SI80X420S with the SAI80X420S
To replace the SI80X420S, order the SAI80X420S ensuring the ISO 15552 mounting interface, 80mm bore, 420mm stroke, M20x1.5 rod thread and G3/8 port match your fixture. Keep the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If you need more force, the 100mm bore offers 3927N push at 0.5MPa; if less is needed, the 63mm bore provides 1559N. Note that a 420mm stroke requires external guides to prevent rod bending under side loads. For load holding on air loss, use an external rod lock or pilot check valve, as the cushion only decelerates.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X420S
- ✓ 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 SI80X420S FAQ
Yes, the SI80X420S is discontinued. The direct replacement is the SAI80X420S, a current ISO 15552 cylinder with the same 80mm bore, 420mm stroke, 2513N force, G3/8 port and mounting interface.
The 80mm bore uses a G3/8 port. It generates 2513N push and 2268N pull at 0.5MPa, 3518N push at 0.7MPa, 4523N push at 0.9MPa, and a theoretical max of 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X420S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X420S replacement — usually within 7-8 hours.