This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX120STC, 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 SI63BX120STC
The AirTAC SI63 Standard Cylinder SI63BX120STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 120mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX120STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke120 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX120STC
- 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 SI63BX120STC
The AirTAC SI63BX120STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 120mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, features a SUS304 stainless steel rod, a G3/8 port, and includes a piston magnet for CS1-B/DS1-B sensors. AirTAC replaced it with the SAI63BX120STC.
The SAI63BX120STC is a direct replacement, matching the original TC trunnion mounting, output force, and ISO 15552 interface. The upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX120STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX120STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX120STC |
| Bore size | Ø63 mm |
| Stroke | 120 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 SAI63BX120STC 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 SAI63BX120STC 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 SI63BX120STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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 SI63BX120STC Is Used
Stainless Rod Clamping
Ideal for packaging lines requiring washdown resistance, using the SUS304 rod to actuate clamping arms with 1559N force at 0.5MPa.
TC Trunnion Diverting
The TC trunnion mount handles pivoting loads on conveyor diverters, smoothly decelerating 120mm strokes via adjustable air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63BX120STC with the SAI63BX120STC
To replace the SI63BX120STC, order the SAI63BX120STC. It drops into existing fixtures via the ISO 15552 mounting interface and TC trunnion accessory, keeping the 63mm bore, 120mm stroke, G3/8 port, and -S magnet for current AirTAC switches. When sizing, the 63mm bore yields 1559N push at 0.5MPa; dropping to a 50mm bore gives 982N, while an 80mm bore provides 2513N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. The SUS304 rod suits corrosive environments, and Viton H seals raise heat to 150C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX120STC
- ✓ 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 SI63BX120STC FAQ
Yes, the SI63BX120STC is discontinued. The direct replacement is the SAI63BX120STC. It shares the identical ISO 15552 mounting interface, 63mm bore, 120mm stroke, G3/8 port, TC mount, and force ratings, but features an upgraded two Y-shaped one-way piston seal for longer life.
The 63mm bore features a G3/8 air port and delivers 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318 kgf at 1.0MPa. It operates at 30-800 mm/s with a 30mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX120STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX120STC replacement — usually within 7-8 hours.