This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X45STC, 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 SI63X45STC
The AirTAC Airtac SI63 Standard Cylinder SI63X45STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 45mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X45STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke45 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X45STC
- 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 SI63X45STC
The AirTAC SI63X45STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 45mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X45STC, a direct upgrade retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and TC trunnion mount.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family introduces SAIL lock and SAIF integrated valve variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63X45STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X45STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X45STC |
| Bore size | Ø63 mm |
| Stroke | 45 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 SAI63X45STC 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 SAI63X45STC 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 SI63X45STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×45 | 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 SI63X45STC Is Used
Short-Stroke Clamping
Ideal for holding heavy machined parts during milling, utilizing the 1559N push force to secure components firmly against fixtures.
Package Diverting
Provides rapid 45mm actuation to push medium-weight cartons off a main production line onto secondary packaging branches.
Gate Mechanisms
Drives compact safety guard doors or material flow gates on automated assembly lines where a short, powerful 63mm bore movement is required.
Replacing the Airtac SI63 Standard Cylinder SI63X45STC with the SAI63X45STC
To replace the SI63X45STC, order the SAI63X45STC and verify the ISO 15552 TC trunnion interface, 63mm bore, 45mm stroke, G3/8 port, and -S magnet. If downsizing, a 50mm bore yields 982N push at 0.5MPa; if upsizing, an 80mm bore provides 2513N. Note that 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 for load holding. The 45mm stroke avoids rod-bending side-load risks seen in longer strokes.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X45STC
- ✓ 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 SI63X45STC FAQ
Yes, the AirTAC SI63X45STC is discontinued. The direct replacement is the SAI63X45STC. It shares the identical ISO 15552 mounting interface, 63mm bore, 45mm stroke, output force, G3/8 port, and TC trunnion mount, fitting directly into existing fixtures.
This 63mm bore double-acting cylinder features a G3/8 air port. It delivers 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 SAI63X45STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X45STC replacement — usually within 7-8 hours.