This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX120, 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 SI63BX120
The AirTAC Airtac SI63 Standard Cylinder SI63BX120 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 SAI63BX120, 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 → SAI63BX120
- 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 SI63BX120
The AirTAC SI63BX120 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 120 mm stroke. It features a SUS304 stainless piston rod for corrosion resistance, a G3/8 port, and delivers 1559 N push force at 0.5 MPa. The direct replacement is the SAI63BX120, matching the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this specific SKU lacks a magnet, so it cannot accept position switches.
Airtac SI63 Standard Cylinder SI63BX120 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX120 |
| 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 SAI63BX120 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 SAI63BX120 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 SI63BX120
| 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 SI63BX120 Is Used
Stainless Rod Clamping
Uses the SUS304 rod to secure washed components in food-grade or moist environments without surface corrosion.
Mid-Force Diverting
Provides 1559 N at 0.5 MPa to push heavy packages cleanly across transfer lines with adjustable cushions.
Replacing the Airtac SI63 Standard Cylinder SI63BX120 with the SAI63BX120
To replace the SI63BX120, order the SAI63BX120. It drops into existing fixtures via the identical ISO 15552 mounting interface, keeping the 63 mm bore, 120 mm stroke, M16x1.5 rod thread, and G3/8 port. Because this SKU has no -S magnet, you cannot mount legacy CS1-B/DS1-B sensors; if sensing is required, switch to an SAI63X120S equivalent. When sizing, neighbouring bores (50 mm or 80 mm) offer 982 N or 2513 N push at 0.5 MPa respectively. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. At 120 mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX120
- ✓ 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 SI63BX120 FAQ
Yes, the SI63BX120 is discontinued. The direct replacement is the SAI63BX120. It shares the identical ISO 15552 mounting interface, bore, stroke, force, and G3/8 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 63 mm bore uses a G3/8 port. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX120 replacement — usually within 7-8 hours.