This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX20, 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 SI63BX20
The AirTAC Airtac SI63 Standard Cylinder SI63BX20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX20
- 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 SI63BX20
The AirTAC SI63BX20 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 20 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. This SKU uses a SUS304 stainless piston rod (-B) for corrosion resistance but lacks a magnet, so it cannot accept position sensors.
You must order the direct replacement SAI63BX20, which shares the exact ISO 15552 mounting interface, bore, and force. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SI63 Standard Cylinder SI63BX20 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX20 |
| Bore size | Ø63 mm |
| Stroke | 20 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 SAI63BX20 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 SAI63BX20 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 SI63BX20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×20 | 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 SI63BX20 Is Used
Stainless Rod Clamping
Short-stroke clamping of machined parts in damp or wash-down environments, leveraging the SUS304 rod for corrosion resistance.
Compact Ejector
Ejecting lightweight components from automated tooling where the 1559 N push force at 0.5 MPa provides ample impact within a tight 20 mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63BX20 with the SAI63BX20
To replace this discontinued SI63BX20, order the SAI63BX20. Verify your ISO 15552 mounting fixtures, the G3/8 port, and the M16x1.5 rod thread. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B switches; if sensing is needed, select an SAI model with an S suffix. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variants. If sizing up or down, neighbouring bores (50 mm or 80 mm) offer 982 N or 2513 N push at 0.5 MPa respectively.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX20
- ✓ 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 SI63BX20 FAQ
Yes, the AirTAC SI63BX20 is discontinued. The direct replacement is the SAI63BX20. It shares the identical ISO 15552 mounting interface, 63 mm bore, 20 mm stroke, output force, and G3/8 port, fitting directly into your existing fixtures.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. It generates 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.
Request a Quote for the SAI63BX20
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX20 replacement — usually within 7-8 hours.