This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X65STC, 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 SI63X65STC
The AirTAC Airtac SI63 Standard Cylinder SI63X65STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 65mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X65STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke65 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X65STC
- 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 SI63X65STC
The AirTAC SI63X65STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 65mm stroke. Generating 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63X65STC. This direct upgrade shares the exact ISO 15552 mounting interface, M16x1.5 rod thread, and TC trunnion dimensions, fitting existing fixtures seamlessly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S magnet works with CS1-B/DS1-B sensors, while Viton H seals raise heat resistance to 150C.
Airtac SI63 Standard Cylinder SI63X65STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X65STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X65STC |
| Bore size | Ø63 mm |
| Stroke | 65 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 SAI63X65STC 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 SAI63X65STC 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 SI63X65STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×65 | 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 SI63X65STC Is Used
Mid-Tonnage Clamping
Secures heavy weldments and machining blanks in automated fixtures, utilizing the 1559N push force to hold components rigidly against cutting or joining forces.
Pallet Diverting
Actuates routing gates and stops on 63mm bore conveyor lines, providing the robust stroke needed to redirect heavy product flows without bouncing.
Replacing the Airtac SI63 Standard Cylinder SI63X65STC with the SAI63X65STC
To replace the SI63X65STC, order the SAI63X65STC. Verify the ISO 15552 TC trunnion mount, 63mm bore, 65mm stroke, G3/8 port, and -S magnet. It delivers 1559N push at 0.5MPa; if undersized, the 80mm bore offers 2513N. 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 variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X65STC
- ✓ 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 SI63X65STC FAQ
Yes, the SI63X65STC is discontinued. The direct replacement is the SAI63X65STC. It shares the identical ISO 15552 mounting interface, 65mm stroke, G3/8 port, and output force, dropping straight into your existing TC trunnion setup.
This 63mm bore cylinder uses a G3/8 air 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X65STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X65STC replacement — usually within 7-8 hours.