This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X435, 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 SI63X435
The AirTAC Airtac SI63 Standard Cylinder SI63X435 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 435mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X435, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke435 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X435
- 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 SI63X435
The AirTAC SI63X435 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 435mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X435, a direct replacement retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30mm cushions.
The SAI upgrade features a redesigned piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnetic SKU cannot accept a sensor; CS1-B/DS1-B switches only fit the -S variant. For high heat, Viton H seals raise the limit to 150C.
Airtac SI63 Standard Cylinder SI63X435 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X435 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X435 |
| Bore size | Ø63 mm |
| Stroke | 435 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 SAI63X435 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 SAI63X435 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 SI63X435
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×435 | 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 SI63X435 Is Used
Material Diversion
Drives 435mm stroke diverters on medium-duty conveyor lines using 1559N push force to re-route 79kg vertical equivalent loads.
Pallet Handling
Actuates 63mm bore lifting arms for pallet staging, relying on the G3/8 port and adjustable 30mm cushions to absorb end-of-stroke impact.
Press Ejection
Ejects formed parts from mid-size presses where a 435mm reach is required and the ISO 15552 interface allows direct fixture swapping.
Replacing the Airtac SI63 Standard Cylinder SI63X435 with the SAI63X435
To replace the SI63X435, order the SAI63X435. Verify your ISO 15552 mounting (LB, FA, TC, etc.), G3/8 port, and M16x1.5 rod thread. Because this 435mm stroke is long, use external guides to prevent rod bending and side-load wear. If sizing up or down, a 50mm bore gives 982N push while an 80mm bore yields 2513N at 0.5MPa. This non-magnetic version cannot take a sensor. The cushion only decelerates; it does not hold load on air loss. For static holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X435
- ✓ 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 SI63X435 FAQ
Yes, the SI63X435 is discontinued. The direct replacement is the AirTAC SAI63X435. It shares the identical ISO 15552 mounting interface, 63mm bore, 435mm stroke, output force, G3/8 port, and accessories, so it fits existing fixtures without modification.
The 63mm bore delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a max force of 318kgf at 1.0MPa. Operating speed is 30-800mm/s. The G3/8 port and M16x1.5 rod thread are fixed by the bore.
Request a Quote for the SAI63X435
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X435 replacement — usually within 7-8 hours.