This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX950S, 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 SI63AX950S
The AirTAC Airtac SI63 Standard Cylinder SI63AX950S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 950mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX950S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke950 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX950S
- 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 SI63AX950S
The AirTAC SI63AX950S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 950 mm stroke, and a SUS420J2 stainless steel piston rod. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63AX950S, retaining the same interface, bore, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal 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 SI63 Standard Cylinder SI63AX950S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX950S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX950S |
| Bore size | Ø63 mm |
| Stroke | 950 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 SAI63AX950S 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 SAI63AX950S 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 SI63AX950S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×950 | 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 SI63AX950S Is Used
Long-Stroke Diversion
Pushes heavy pallets sideways on a packaging line using the 950 mm stroke and 1559 N force at 0.5 MPa.
Stainless Rod Actuation
Drives tooling stages in humid washdown areas using the SUS420J2 rod option for corrosion resistance.
Replacing the Airtac SI63 Standard Cylinder SI63AX950S with the SAI63AX950S
To replace this SI63AX950S, order the SAI63AX950S. Confirm the ISO 15552 mounting interface, 63 mm bore, 950 mm stroke, G3/8 port, and your -A SUS420J2 rod with -S magnet. Sizing both ways: a 50 mm bore yields 982 N [email protected], while an 80 mm bore yields 2513 N. For loads needing holding without live air, use the SAIL or BSAI lock variant, as cushions only decelerate. At 950 mm, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX950S
- ✓ 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 SI63AX950S FAQ
Yes, the SI63AX950S is discontinued. The direct replacement is the SAI63AX950S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 950 mm stroke, force, G3/8 port, and mounting fixtures exactly.
It uses a G3/8 port. Force ratings are: 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 318 kgf theoretical max at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX950S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX950S replacement — usually within 7-8 hours.