This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25SN, 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 SI63X25SN
The AirTAC SI63 Standard Cylinder SI63X25SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X25SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X25SN
- 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 SI63X25SN
The AirTAC SI63X25SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 25 mm stroke, and a G3/8 air port. It delivers 1559 N push force at 0.5 MPa. The direct replacement is the SAI63X25SN, which shares the exact ISO 15552 mounting interface, output force, and accessories. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This NBR-sealed unit operates from -20 to +70 C, with a Viton H option for high heat.
The installed magnet supports legacy CS1-B/DS1-B sensors, while the SAI replacement family uses current AirTAC switches. For load-holding needs the SI lacked, the newer SAIL or BSAI lock variants provide pneumatic braking.
Airtac SI63 Standard Cylinder SI63X25SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25SN |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63X25SN 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 SAI63X25SN 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 SI63X25SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63X25SN Is Used
Short-Stroke Clamping
Ideal for holding parts securely during machining operations using its 1559 N push force over a compact 25 mm travel.
Diversion Gate Actuation
Provides rapid and reliable routing of packages on production lines with a fast 30-800 mm/s speed range.
Pallet Stop Mechanism
Acts as a robust pneumatic stop for heavy pallets, utilizing the 63 mm bore to halt loads without drifting.
Replacing the Airtac SI63 Standard Cylinder SI63X25SN with the SAI63X25SN
To replace this SI63X25SN, order the SAI63X25SN direct, confirming the ISO 15552 interface, 63 mm bore, 25 mm stroke, G3/8 port, NBR seals, and the -S magnet for position sensing. If you need to size both ways, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Remember a plain cylinder does not hold load without live air; the cushion only decelerates. For secure holding, use an external pilot check valve or explore the SAIL and BSAI lock variants. The SAIF variant adds a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25SN
- ✓ 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 SI63X25SN FAQ
Yes, the AirTAC SI63X25SN is discontinued. The direct replacement is the SAI63X25SN. It shares the same ISO 15552 mounting interface, 63 mm bore, 25 mm stroke, force, and G3/8 port, fitting directly into existing fixtures.
The 63 mm bore features a G3/8 port and delivers a push force of 1559 N and pull of 1402 N at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X25SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25SN replacement — usually within 7-8 hours.