This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X325S, 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 SI63X325S
The AirTAC Airtac SI63 Standard Cylinder SI63X325S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 325mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X325S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke325 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X325S
- 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 SI63X325S
The AirTAC SI63X325S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 325 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X325S, matching the exact bore, stroke, force, and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X325S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X325S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X325S |
| Bore size | Ø63 mm |
| Stroke | 325 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 SAI63X325S 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 SAI63X325S 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 SI63X325S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×325 | 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 SI63X325S Is Used
Package Diverting
Routes heavy cartons on packaging lines using the 1559 N push force, while the 325 mm stroke clears obstructions during transit.
Press Ejection
Ejects formed metal parts from press beds, utilizing the adjustable 30 mm air cushions to decelerate the rod smoothly at stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63X325S with the SAI63X325S
To replace the SI63X325S, order the SAI63X325S and confirm the ISO 15552 mounting interface, 325 mm stroke, G3/8 port (PT/G/NPT), and your specific mounting accessory. The built-in -S magnet allows for position sensing. When sizing, neighboring bores offer different capacities: a 50 mm bore provides 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. For this 325 mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X325S
- ✓ 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 SI63X325S FAQ
Yes, the SI63X325S is discontinued. The direct replacement is the SAI63X325S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 325 mm stroke, output force, G3/8 port, and mounting accessories.
This 63 mm bore cylinder features a G3/8 air port and a Ø20 mm piston rod. It generates 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 of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X325S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X325S replacement — usually within 7-8 hours.