This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X940S, 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 SI63X940S
The AirTAC SI63 Standard Cylinder SI63X940S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 940mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X940S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke940 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X940S
- 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 SI63X940S
The AirTAC SI63X940S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 940 mm stroke, delivering 1559 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI63X940S, a direct sharing the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock variants (SAIL, BSAI) absent in the SI line.
Airtac SI63 Standard Cylinder SI63X940S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X940S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X940S |
| Bore size | Ø63 mm |
| Stroke | 940 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 SAI63X940S 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 SAI63X940S 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 SI63X940S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×940 | 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 SI63X940S Is Used
Long-Stroke Diversion
Pushes heavy packages across transfer lines using the full 940 mm travel with 1559 N force at 0.5 MPa.
Pallet Push-Off
Acts as a main ejector for pallet handling systems, moving loads safely under the 935 N working threshold.
Replacing the Airtac SI63 Standard Cylinder SI63X940S with the SAI63X940S
To replace the SI63X940S, order the SAI63X940S and verify your ISO 15552 mounting accessories (LB, FA, CA, TC), the G3/8 air port, and the CS1-B/DS1-B legacy sensors (the SAI uses current AirTAC switches). Sizing alternatives: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI variant. Because the 940 mm stroke is long, prevent rod bending by ensuring external guides handle side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X940S
- ✓ 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 SI63X940S FAQ
Yes, the SI63X940S is discontinued. The direct replacement is the SAI63X940S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 940 mm stroke, force, and G3/8 port, fitting existing fixtures perfectly.
It features a G3/8 air port and provides 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 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 SAI63X940S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X940S replacement — usually within 7-8 hours.