This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25, 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 SI63X25
The AirTAC Airtac SI63 Standard Cylinder SI63X25 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 SAI63X25, 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 → SAI63X25
- 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 SI63X25
The AirTAC SI63X25 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 25mm stroke, delivering 1559N push force at 0.5MPa. The direct replacement is the SAI63X25, matching the exact bore, stroke, output force, G3/8 port and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-S SKU cannot take a sensor, unlike CS1-B/DS1-B legacy switches.
Airtac SI63 Standard Cylinder SI63X25 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25 |
| 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 SAI63X25 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 SAI63X25 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 SI63X25
| 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 SI63X25 Is Used
Short-Stroke Clamping
Ideal for high-force 63mm clamping tasks where only 25mm of travel is needed to secure heavy machined parts during milling or drilling operations.
Ejector Mechanism
Provides robust 1559N push force to eject dense metal components or molded products rapidly from a fixture on an automated assembly line.
Press Fit Assembly
Delivers reliable downward thrust for pressing small bearings or pins into housings, utilizing adjustable end cushions to soften the impact.
Replacing the Airtac SI63 Standard Cylinder SI63X25 with the SAI63X25
To replace the SI63X25, order the SAI63X25 direct: it matches the ISO 15552 mounting interface, 63mm bore, 25mm stroke, G3/8 port (PT/G/NPT) and M16x1.5 rod thread. If sizing up or down, neighboring bores are 50mm and 80mm. At 0.5MPa the 63mm yields 1559N push and 1402N pull. Note a plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve. This non-magnetic SKU cannot accept a switch.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25
- ✓ 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 SI63X25 FAQ
Yes, the SI63X25 is discontinued. The direct replacement is the AirTAC SAI63X25. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 25mm stroke, output force, G3/8 port and mounting accessories.
The 63mm bore features a G3/8 air 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 maximum theoretical force of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI63X25
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25 replacement — usually within 7-8 hours.