This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X35, 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 SI63X35
The AirTAC Airtac SI63 Standard Cylinder SI63X35 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 35mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X35, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke35 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X35
- 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 SI63X35
The AirTAC SI63X35 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 35mm stroke, delivering 1559N push force at 0.5MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI63X35 direct replacement, matching the exact ISO 15552 mounting interface, bore, stroke, output force and port size for seamless fixture integration.
The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S) and cannot accept a sensor, though legacy SI sensors were CS1-B/DS1-B.
Airtac SI63 Standard Cylinder SI63X35 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X35 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X35 |
| Bore size | Ø63 mm |
| Stroke | 35 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 SAI63X35 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 SAI63X35 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 SI63X35
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×35 | 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 SI63X35 Is Used
Short-Stroke Clamping
Ideal for holding heavy workpieces in machining fixtures where a compact 35mm stroke provides high 1559N clamping force at 0.5MPa.
Package Diverting
Delivers rapid 30-800mm/s actuation for diverting heavier goods on packaging lines, utilizing the 63mm bore for robust push force.
Replacing the Airtac SI63 Standard Cylinder SI63X35 with the SAI63X35
To replace the SI63X35, order the SAI63X35. Verify your ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port thread (PT/G/NPT), and the M16x1.5 rod end. Because this SKU has no magnet, it cannot support position sensing; if you need switches, select an SAI63X35S and use current AirTAC sensors. If sizing alternatives, a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. At 35mm stroke, side-load risks are minimal, but ensure rigid rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X35
- ✓ 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 SI63X35 FAQ
Yes, the SI63X35 is discontinued. The direct replacement is the AirTAC SAI63X35. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 35mm stroke, G3/8 port, and mounting interface.
It 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, with a theoretical maximum of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI63X35
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X35 replacement — usually within 7-8 hours.