This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X625S, 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 SI63X625S
The AirTAC Airtac SI63 Standard Cylinder SI63X625S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 625mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X625S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke625 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X625S
- 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 SI63X625S
The AirTAC SI63X625S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 625mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced it with the SAI63X625S, a direct upgrade keeping the exact interface, bore, stroke, force, and mounting.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X625S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X625S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X625S |
| Bore size | Ø63 mm |
| Stroke | 625 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 SAI63X625S 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 SAI63X625S 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 SI63X625S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×625 | 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 SI63X625S Is Used
Material Diversion
Drives long-travel sorting gates on packaging lines, utilizing the 1559N push force to reliably deflect heavy cartons at high cycle rates.
Pallet Handling
Actuates 625mm stroke lifting forks or pusher arms in automated storage systems, moving loads safely within the 79kg vertical lift margin.
Long-Reach Clamping
Extends 625mm to secure large fabricated workpieces at machining centers, maintaining rigid clamping via the ISO 15552 profile barrel.
Replacing the Airtac SI63 Standard Cylinder SI63X625S with the SAI63X625S
To replace the SI63X625S, order the SAI63X625S direct. Confirm the ISO 15552 mounting interface, 625mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For 625mm strokes, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X625S
- ✓ 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 SI63X625S FAQ
Yes, the SI63X625S is discontinued. The direct replacement is the SAI63X625S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 625mm stroke, output force, G3/8 port, and mounting interface.
The 63mm bore features a G3/8 port and M16x1.5 rod thread. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X625S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X625S replacement — usually within 7-8 hours.