This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X335, 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 SI63X335
The AirTAC SI63 Standard Cylinder SI63X335 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 335mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X335, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke335 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X335
- 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 SI63X335
The AirTAC SI63X335 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 335mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, operating at 30-800mm/s with a G3/8 port. AirTAC replaced this with the SAI63X335, a direct upgrade retaining the exact ISO 15552 mounting interface, force, and port size.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet (-S) so it cannot take a sensor. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63X335 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X335 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X335 |
| Bore size | Ø63 mm |
| Stroke | 335 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 SAI63X335 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 SAI63X335 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 SI63X335
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×335 | 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 SI63X335 Is Used
Pallet Diversion
Pushes heavy pallets sideways at 1559N push force, using the 335mm stroke to clear adjacent conveyor lanes.
Case Erection
Actuates large cardboard carton flaps during automated packing, relying on the 335mm extended reach.
Replacing the Airtac SI63 Standard Cylinder SI63X335 with the SAI63X335
To replace the SI63X335, order the SAI63X335. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G3/8 port thread (PT/G/NPT), and the M16x1.5 rod end. Because this SKU has no -S magnet, it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if position sensing is needed. For sizing, the 63mm bore gives 1559N push at 0.5MPa; dropping to 50mm yields 982N, while 80mm provides 2513N. A standard cylinder does not hold load on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for holding. At 335mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X335
- ✓ 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 SI63X335 FAQ
Yes, the SI63X335 is discontinued. The direct replacement is the AirTAC SAI63X335. It shares the identical ISO 15552 mounting interface, 63mm bore, 335mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G3/8 port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Request a Quote for the SAI63X335
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X335 replacement — usually within 7-8 hours.