This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X900S, 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 SI63X900S
The AirTAC Airtac SI63 Standard Cylinder SI63X900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 900mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke900 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X900S
- 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 SI63X900S
The AirTAC SI63X900S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 900 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X900S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force and port size.
The SAI upgrade features a refined piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original SI-S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family expands options with SAIL, SAIF and BSAI variants.
Airtac SI63 Standard Cylinder SI63X900S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X900S |
| Bore size | Ø63 mm |
| Stroke | 900 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 SAI63X900S 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 SAI63X900S 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 SI63X900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×900 | 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 SI63X900S Is Used
Long-Stroke Diversion
Pushes packages across a 900 mm conveyor gap with 1559 N thrust at 0.5 MPa, requiring external guides to prevent rod bending.
Automated Press Ejection
Ejects formed parts from a 63 mm bore press line, relying on the 30 mm adjustable air cushions to decelerate the 900 mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63X900S with the SAI63X900S
To replace the SI63X900S, order the SAI63X900S. Confirm the ISO 15552 mounting interface, the 63 mm bore, the 900 mm stroke, the G3/8 port (available in PT, G or NPT), your mounting accessory (such as LB foot or TC trunnion) and the -S magnet for current AirTAC switches. When sizing, a 50 mm bore yields 982 N push at 0.5 MPa, whereas an 80 mm bore provides 2513 N. For this 900 mm stroke, prevent rod bending by guiding the load externally to avoid side-load stress. A standard cylinder drifts without live air; for load holding on pressure loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X900S
- ✓ 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 SI63X900S FAQ
Yes, the SI63X900S is discontinued. The direct replacement is the SAI63X900S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 900 mm stroke, output force and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore uses a G3/8 port. 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 SAI63X900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X900S replacement — usually within 7-8 hours.