This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X323S, 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 SI63 Standard Cylinder SI63X323S
The AirTAC Airtac SI63 Standard Cylinder SI63X323S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 323mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X323S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke323 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X323S
- 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 SI63 Standard Cylinder SI63X323S
The AirTAC SI63X323S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 323 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X323S, matching the exact interface, bore, stroke, force, port and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked.
The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors. A plain cylinder does not hold load on air loss; the cushion only decelerates. For secure holding, use the SAIL lock variant or an external pilot check valve.
Airtac SI63 Standard Cylinder SI63X323S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X323S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X323S |
| Bore size | Ø63 mm |
| Stroke | 323 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X323S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X323S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X323S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×323 | 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 SI63 Standard Cylinder SI63X323S Is Used
Package Diversion
Drives diverter arms on packaging lines, using the 1559 N push force to reliably redirect heavy cartons at high cycling speeds.
Material Lowering
Lowers stacked components onto assembly pallets, benefiting from the 30 mm adjustable air cushions to prevent end-of-stroke impact.
Pallet Handling
Indexes loaded pallets into wrapping stations, where the 323 mm stroke provides the extended reach needed for automated positioning.
Replacing the Airtac SI63 Standard Cylinder SI63X323S with the SAI63X323S
To replace the SI63X323S, order the SAI63X323S direct. Confirm the ISO 15552 mounting interface, 63 mm bore, 323 mm stroke, G3/8 port (PT/G/NPT thread options) and mounting accessory. The -S magnet allows current AirTAC switches to replace legacy CS1-B/DS1-B sensors. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. With a 323 mm stroke, prevent rod bending by adding external guides to manage side loads. For load holding on air loss, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X323S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X323S FAQ
Yes, the SI63X323S is discontinued. The direct replacement is the SAI63X323S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 323 mm stroke, output force, G3/8 port and mounting fixtures.
The 63 mm bore features a G3/8 air port and M16x1.5 rod thread. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X323S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X323S replacement — usually within 7-8 hours.