This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25H, 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 SI63X25H
The AirTAC Airtac SI63 Standard Cylinder SI63X25H 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 SAI63X25H, 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 → SAI63X25H
- 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 SI63X25H
The AirTAC SI63X25H is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 25mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X25H, retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread and output force.
This H-seal variant uses Viton FKM for 0-150C environments. The SAI upgrade features two Y-shaped piston seals for low start-up pressure. Without a -S magnet, this SKU cannot take a sensor.
Airtac SI63 Standard Cylinder SI63X25H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25H |
| 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 SAI63X25H 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 SAI63X25H 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 SI63X25H
| 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 SI63X25H Is Used
High-Temp Clamping
Short-stroke clamping of cast parts near ovens or heat zones, utilizing the Viton H seal to withstand 150C ambient temperatures.
Ejector Gate
Actuating heavy-duty ejection gates where the 1559N push force at 0.5MPa reliably clears debris without requiring full system pressure.
Press Fit Station
Short 25mm press operations for seating bearings, relying on the rigid ISO 15552 profile barrel to resist side loads during impact.
Replacing the Airtac SI63 Standard Cylinder SI63X25H with the SAI63X25H
To replace the SI63X25H, order the SAI63X25H. Confirm the ISO 15552 mounting interface, G3/8 port, and 25mm stroke. This non-magnet SKU cannot accept CS1-B/DS1-B sensors; order an SAI with -S if sensing is needed. For 0-150C heat, retain the Viton H seal. The 63mm bore yields 1559N push at 0.5MPa; step down to a 50mm bore (982N) or up to an 80mm bore (2513N) to size both ways. Air cushions only decelerate; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25H
- ✓ 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 SI63X25H FAQ
Yes, the SI63X25H is discontinued. The direct replacement is the SAI63X25H. It shares the same ISO 15552 mounting interface, 63mm bore, 25mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The 63mm bore features a G3/8 port and M16x1.5 rod thread. It generates 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. Speed is 30-800mm/s.
Request a Quote for the SAI63X25H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25H replacement — usually within 7-8 hours.