This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X900STC, 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 SI63X900STC
The AirTAC Airtac SI63 Standard Cylinder SI63X900STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 900mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X900STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke900 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X900STC
- 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 SI63X900STC
The AirTAC SI63X900STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 900mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X900STC, a direct upgrade retaining the exact interface, TC trunnion mount, and output.
The SAI successor features an upgraded piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X900STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X900STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X900STC |
| Bore size | Ø63 mm |
| Stroke | 900 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 SAI63X900STC 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 SAI63X900STC 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 SI63X900STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×900 | 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 SI63X900STC Is Used
Long-Stroke Diversion
Drives large pusher arms on packaging lines to deflect heavy goods into secondary lanes over a 900mm reach.
Pallet Elevator Gate
Actuates tall safety gates or lifting stops at palletizing cells where a 63mm bore provides ample 1559 N force.
Replacing the Airtac SI63 Standard Cylinder SI63X900STC with the SAI63X900STC
To replace the SI63X900STC, order the SAI63X900STC. Verify the ISO 15552 TC trunnion mounting dimensions, 63mm bore, 900mm stroke, G3/8 port, and the -S magnet. If you need more force, the neighbouring 80mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50mm bore provides 982 N. Because this is a 900mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X900STC
- ✓ 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 SI63X900STC FAQ
Yes, the AirTAC SI63X900STC is discontinued. The direct replacement is the SAI63X900STC. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 900mm stroke, G3/8 port, TC mount, and output force.
The 63mm bore uses a G3/8 air port. It generates 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X900STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X900STC replacement — usually within 7-8 hours.