This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25S, 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 SI63X25S
The AirTAC Airtac SI63 Standard Cylinder SI63X25S 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 SAI63X25S, 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 → SAI63X25S
- 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 SI63X25S
The AirTAC SI63X25S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 25mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X25S, matching the exact interface, bore, stroke, force, port and mounting.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix means this SKU includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X25S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25S |
| 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 SAI63X25S 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 SAI63X25S 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 SI63X25S
| 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 SI63X25S Is Used
Short-Stroke Clamping
Ideal for holding heavy metal castings during CNC machining, using the 1559 N push force to secure parts firmly within a tight 25mm travel.
Package Diverting
Provides robust actuation for diverting heavier pallets or goods on a packaging line, where the 63mm bore ensures reliable stops without bounce.
Press Ejection
Delivers rapid ejection of formed components from press dies, utilizing the 30-800 mm/s speed range and 1402 N pull force for quick retraction.
Replacing the Airtac SI63 Standard Cylinder SI63X25S with the SAI63X25S
To replace this SI cylinder, order the SAI63X25S. Confirm the ISO 15552 mounting interface, the 63mm bore, the 25mm stroke, the G3/8 port (PT/G/NPT thread), and the -S magnet for position sensing. If you need more force, the neighbouring 80mm bore offers 2513 N push at 0.5 MPa; if less is required, the 50mm bore provides 982 N. A plain cylinder drifts on air loss as the cushion only decelerates, so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25S
- ✓ 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 SI63X25S FAQ
Yes, the SI63X25S is discontinued. The direct replacement is the AirTAC SAI63X25S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 25mm stroke, G3/8 port, and mounting accessories exactly.
This double-acting cylinder operates at 30-800 mm/s. The thrust is 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 max of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X25S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25S replacement — usually within 7-8 hours.