This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X450CA, 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 SI63X450CA
The AirTAC Airtac SI63 Standard Cylinder SI63X450CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 450mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X450CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke450 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X450CA
- 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 SI63X450CA
The AirTAC SI63X450CA is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 450 mm stroke, delivering 1559 N push force at 0.5 MPa. The direct replacement is the SAI63X450CA, which shares the exact same ISO 15552 mounting interface, CA clevis, G3/8 port, and output force. This SKU lacks the -S magnet, so it cannot accept a CS1-B or DS1-B sensor.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If you need load holding on air loss, the plain cylinder drifts; use the SAIL lock or BSAI clamp-lock variant, or an external pilot check valve.
Airtac SI63 Standard Cylinder SI63X450CA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X450CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X450CA |
| Bore size | Ø63 mm |
| Stroke | 450 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 SAI63X450CA 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 SAI63X450CA 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 SI63X450CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×450 | 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 SI63X450CA Is Used
Press Ejection
Provides 1559 N of push force at 0.5 MPa to reliably eject formed metal parts from a stamping die, using the 450 mm stroke to clear the press bed fully.
Pallet Diversion
Actuates a CA clevis-mounted routing gate on a packaging line, with the 63 mm bore delivering enough force to pivot heavy pallets without hesitation.
Vertical Lift Gates
Raises and lowers material handling gates; note that an external pilot check valve is required here because the standard cylinder cannot hold the load without live air.
Replacing the Airtac SI63 Standard Cylinder SI63X450CA with the SAI63X450CA
To replace the SI63X450CA, order the SAI63X450CA. Verify the ISO 15552 interface, 63 mm bore, 450 mm stroke, G3/8 port, and CA clevis mounting. Because this is a non-magnet SKU, it cannot support position sensing; if you need switches, select an SAI model with the S suffix for current AirTAC sensors. At 0.5 MPa the 63 mm bore yields 1559 N push and 1402 N pull; if undersizing, a 50 mm bore gives 982 N push, and if oversizing, an 80 mm bore provides 2513 N push. For this 450 mm stroke, use an external guide to prevent rod bending and side-load damage. The air cushion only decelerates the piston near stroke end and will not hold a load on air loss—specify an external rod lock or pilot check valve for vertical applications.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X450CA
- ✓ 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 SI63X450CA FAQ
Yes, the SI63X450CA is discontinued. The direct replacement is the SAI63X450CA. It features the same ISO 15552 mounting interface, 63 mm bore, 450 mm stroke, G3/8 port, and CA clevis, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 63 mm bore features a G3/8 air port, a 20 mm rod, and M16x1.5 rod thread. Force output 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 maximum of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X450CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X450CA replacement — usually within 7-8 hours.