This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X535S, 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 SI63X535S
The AirTAC SI63 Standard Cylinder SI63X535S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 535mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X535S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke535 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X535S
- 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 SI63X535S
The AirTAC SI63X535S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 535mm stroke, delivering 1559 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI63X535S, a direct upgrade retaining the exact G3/8 port, M16x1.5 rod thread, and ISO 15552 mounting interface.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X535S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X535S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X535S |
| Bore size | Ø63 mm |
| Stroke | 535 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 SAI63X535S 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 SAI63X535S 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 SI63X535S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×535 | 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 SI63X535S Is Used
Material Diversion
Actuates routing gates on package lines, utilizing the 1559 N thrust to push heavy cartons reliably at speed.
Vertical Pressing
Provides steady downward pressure for light assembly tasks, safely handling up to 79 kg of vertical load.
Pallet Handling
Drives 535mm stroke stops and lifts in automated storage systems, dropping into existing ISO 15552 fixtures.
Replacing the Airtac SI63 Standard Cylinder SI63X535S with the SAI63X535S
To replace the SI63X535S, order the SAI63X535S and verify your ISO 15552 mounting fixtures, G3/8 port, and M16x1.5 rod thread. The 535mm stroke is within the 1500mm standard limit, but at this length you must account for side-load and rod-bending risks by using an external guide to prevent premature wear. If sizing up or down, the neighboring 50mm bore yields 982 N push at 0.5 MPa, while the 80mm bore provides 2513 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X535S
- ✓ 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 SI63X535S FAQ
Yes, the SI63X535S is discontinued. The direct replacement is the SAI63X535S. It shares the identical ISO 15552 mounting interface, 63mm bore, 535mm stroke, force, and G3/8 port, fitting existing fixtures perfectly.
This 63mm bore cylinder features a G3/8 air port and provides 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, at 0.9 MPa it is 2805 N, and the theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X535S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X535S replacement — usually within 7-8 hours.