This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX950, 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 SI63AX950
The AirTAC Airtac SI63 Standard Cylinder SI63AX950 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 SAI63AX950, 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 → SAI63AX950
- 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 SI63AX950
The AirTAC SI63AX950 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 950 mm stroke. Delivering 1559 N push at 0.5 MPa through a G3/8 port, its direct replacement is the SAI63AX950. The SAI shares the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly. 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 lock variants the SI lacked. This SKU uses a SUS420J2 stainless rod (A) but lacks a magnet, so it cannot take a sensor.
The standard carbon steel rod can be swapped for stainless, and Viton H seals raise the temperature limit to 150 C. Because this is a 950 mm stroke, external guides are recommended to prevent rod bending under side loads.
Airtac SI63 Standard Cylinder SI63AX950 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX950 |
| 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 SAI63AX950 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 SAI63AX950 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 SI63AX950
| 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 SI63AX950 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 950 mm travel, relying on external guides to prevent rod bending during the traverse.
Stainless Rod Actuation
Drives tooling stages in humid wash-down cells using the SUS420J2 rod option to resist corrosion over the extended stroke length.
Replacing the Airtac SI63 Standard Cylinder SI63AX950 with the SAI63AX950
To replace the SI63AX950, order the SAI63AX950. Verify the ISO 15552 mounting interface, 63 mm bore, 950 mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessory. This unit has a SUS420J2 stainless rod and no magnet, meaning it cannot accept CS1-B/DS1-B sensors; order an SAI with the S suffix if position sensing is needed. For sizing alternatives, a 50 mm bore provides 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. At 950 mm, use external guides to prevent rod-bending side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX950
- ✓ 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 SI63AX950 FAQ
Yes, the SI63AX950 is discontinued. The direct replacement is the SAI63AX950. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 950 mm stroke, 1559 N force, G3/8 port, and mounting interface. The SAI upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
The 63 mm bore features a G3/8 air port and a 20 mm rod. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX950 replacement — usually within 7-8 hours.