This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX900S, 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 SI63AX900S
The AirTAC Airtac SI63 Standard Cylinder SI63AX900S 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 SAI63AX900S, 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 → SAI63AX900S
- 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 SI63AX900S
The AirTAC SI63AX900S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 900mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa via a G3/8 port. The direct replacement is the SAI63AX900S, matching the bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SI63AX900S uses a SUS420J2 stainless rod (-A) and a magnet (-S) for CS1-B/DS1-B switches. For load holding, note the air cushion only decelerates; use SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX900S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX900S |
| 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 SAI63AX900S 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 SAI63AX900S 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 SI63AX900S
| 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 SI63AX900S Is Used
Long-Stroke Diversion
Pushes heavy pallets 900mm across a transfer line using the 1559N push force at 0.5MPa, requiring external guides to prevent rod bending.
Automated Press Ejection
Ejects finished parts from a press fixture, relying on the 30mm adjustable air cushions at both ends to decelerate the rapid 900mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63AX900S with the SAI63AX900S
To replace the SI63AX900S, order the SAI63AX900S. Confirm the ISO 15552 mounting interface, 63mm bore, 900mm stroke, G3/8 port (PT/G/NPT thread), SUS420J2 rod (-A) and magnet (-S). For sizing, a 50mm bore gives 982N push at 0.5MPa, while an 80mm bore gives 2513N. At 900mm stroke, prevent rod bending by adding external guides to manage side loads. A plain cylinder drifts on air loss; the cushion only decelerates. For secure holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX900S
- ✓ 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 SI63AX900S FAQ
Yes, the SI63AX900S is discontinued. The direct replacement is the SAI63AX900S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 900mm stroke, G3/8 port, force and mounting interface. The SAI uses an upgraded piston seal for lower start-up pressure.
The 63mm bore uses a G3/8 port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX900S replacement — usually within 7-8 hours.