This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX550STC, 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 SI63BX550STC
The AirTAC Airtac SI63 Standard Cylinder SI63BX550STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX550STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX550STC
- 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 SI63BX550STC
The AirTAC SI63BX550STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 550 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX550STC, matching the bore, stroke, force, port, and TC mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific unit includes a SUS304 stainless rod and a piston magnet for CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63BX550STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX550STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX550STC |
| Bore size | Ø63 mm |
| Stroke | 550 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 SAI63BX550STC 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 SAI63BX550STC 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 SI63BX550STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×550 | 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 SI63BX550STC Is Used
Material Transfer
Drives long-travel diverters on packaging lines, utilizing the 1559 N force to push heavy cartons smoothly at 30-800 mm/s.
Pallet Handling
Actuates 79 kg vertical lift gates or stops via the TC trunnion mount, with the SUS304 rod resisting humidity in damp storage areas.
Long-Stroke Ejection
Ejects molded parts from deep machinery cavities, relying on the 550 mm extension and adjustable 30 mm cushions to decelerate at ends.
Replacing the Airtac SI63 Standard Cylinder SI63BX550STC with the SAI63BX550STC
To replace the SI63BX550STC, order the SAI63BX550STC. Confirm the ISO 15552 TC trunnion mounting, 63 mm bore, 550 mm stroke, G3/8 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). The -B rod is SUS304 stainless steel. If sizing up or down, the 80 mm bore yields 2513 N push at 0.5 MPa, while the 50 mm bore yields 982 N. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because the 550 mm stroke is long, use an external guide to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX550STC
- ✓ 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 SI63BX550STC FAQ
Yes, the SI63BX550STC is discontinued. The direct replacement is the SAI63BX550STC. It is dimensionally interchangeable per ISO 15552, retaining the 63 mm bore, 550 mm stroke, G3/8 port, and TC mounting interface.
It features a G3/8 air port. The force output is 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 SAI63BX550STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX550STC replacement — usually within 7-8 hours.