This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X225, 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 SI63X225
The AirTAC Airtac SI63 Standard Cylinder SI63X225 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 225mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X225, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke225 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X225
- 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 SI63X225
The AirTAC SI63X225 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 225 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa, operating via a G3/8 port. Because this exact SKU lacks a magnet (-S), it cannot accept a position sensor.
AirTAC replaced this legacy unit with the SAI63X225, a direct retaining the same ISO 15552 mounting interface, M16x1.5 rod thread, and force ratings. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life.
Airtac SI63 Standard Cylinder SI63X225 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X225 |
| Bore size | Ø63 mm |
| Stroke | 225 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 SAI63X225 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 SAI63X225 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 SI63X225
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×225 | 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 SI63X225 Is Used
Clamping Fixtures
Applies reliable holding force for machining jigs, utilizing the 1559 N push at 0.5 MPa to secure heavy metal components during milling operations.
Package Diverters
Drives sorting arms on packaging lines where the 225 mm stroke provides adequate travel to push heavy cartons from main belts onto adjacent lanes.
Pallet Stops
Acts as a robust end-stop on roller conveyors, using its 1402 N pull force to retract the stop blade and let loaded pallets pass safely.
Replacing the Airtac SI63 Standard Cylinder SI63X225 with the SAI63X225
To replace the SI63X225, order the SAI63X225 and confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G3/8 port, and the 225 mm stroke. If you require position sensing, note this specific legacy SKU has no magnet and cannot take a switch, so you must select an SAI equivalent with the S magnet option and current AirTAC switches. For load holding, remember a standard cylinder drifts on air loss; the 30 mm adjustable cushions only decelerate the piston near stroke ends. Use an external pilot check valve or explore the SAIL or BSAI lock variants. At 225 mm stroke, side-load and rod-bending risks are moderate, so ensure proper guide alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X225
- ✓ 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 SI63X225 FAQ
Yes, the SI63X225 is discontinued. The direct replacement is the AirTAC SAI63X225. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 225 mm stroke, G3/8 port, and mounting accessories, so it fits existing fixtures perfectly.
The 63 mm bore features a G3/8 air port and a 20 mm 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 force of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI63X225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X225 replacement — usually within 7-8 hours.