This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X825S, 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 SI63X825S
The AirTAC Airtac SI63 Standard Cylinder SI63X825S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 825mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X825S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke825 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X825S
- 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 SI63X825S
The AirTAC SI63X825S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 825 mm stroke. It delivers a push force of 1559 N at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X825S, a direct upgrade retaining the exact interface, bore, stroke, and mounting accessories.
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 variants the SI lacked. The -S magnet works with CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63X825S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X825S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X825S |
| Bore size | Ø63 mm |
| Stroke | 825 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 SAI63X825S 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 SAI63X825S 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 SI63X825S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×825 | 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 SI63X825S Is Used
Long-Stroke Diversion
Pushes heavy pallets sideways on a conveyor line over an 825 mm travel distance, utilizing the 1559 N push force at 0.5 MPa to overcome sliding friction reliably.
Large Press Ejection
Ejects molded components from a deep press bed, where the 63 mm bore and 30 mm adjustable cushions absorb kinetic energy smoothly at the stroke ends.
Replacing the Airtac SI63 Standard Cylinder SI63X825S with the SAI63X825S
To replace the SI63X825S, order the SAI63X825S. Confirm the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). For sizing, the 63 mm bore gives 1559 N push at 0.5 MPa; dropping to a 50 mm bore yields 982 N, while an 80 mm bore provides 2513 N. 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 the SAIL/BSAI lock variant. At 825 mm, this long stroke risks rod bending; use external guides to prevent side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X825S
- ✓ 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 SI63X825S FAQ
Yes, the SI63X825S is discontinued. The direct replacement is the AirTAC SAI63X825S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 825 mm stroke, G3/8 port, and mounting interface, so it fits existing fixtures perfectly.
This double-acting cylinder features a G3/8 air port. The thrust 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 theoretical maximum force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X825S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X825S replacement — usually within 7-8 hours.