This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX350S, 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 SI63BX350S
The AirTAC Airtac SI63 Standard Cylinder SI63BX350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX350S
- 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 SI63BX350S
The AirTAC SI63BX350S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 350 mm stroke, and a SUS304 stainless steel rod. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63BX350S. This direct successor matches the exact bore, stroke, G3/8 port, and ISO 15552 mounting interface, dropping directly into existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. If you need positive load holding under air loss, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX350S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX350S |
| Bore size | Ø63 mm |
| Stroke | 350 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 SAI63BX350S 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 SAI63BX350S 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 SI63BX350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SI63BX350S Is Used
Stainless Rod Diverting
Actuating lane diverters or sorting gates in washdown environments where the SUS304 rod resists corrosion and the 350 mm stroke spans wider product lines.
Extended Reach Gating
Driving long-travel safety guards or machine doors up to 350 mm, requiring external guide rails to support the rod and prevent binding under side loads.
Replacing the Airtac SI63 Standard Cylinder SI63BX350S with the SAI63BX350S
To replace the SI63BX350S, order the SAI63BX350S. Verify the ISO 15552 mounting interface, the 63 mm bore, 350 mm stroke, G3/8 port (PT/G/NPT thread), and the -S magnet for position sensing. The -B rod specifies SUS304 stainless steel for corrosion resistance. When sizing, note a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Because 350 mm exceeds standard short strokes, use external guides to prevent rod bending and side-load wear. Remember that a standard cylinder drifts without air; for load holding on valve centering, specify a pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX350S
- ✓ 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 SI63BX350S FAQ
Yes, the AirTAC SI63BX350S is discontinued. The direct replacement is the SAI63BX350S. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 350 mm stroke, G3/8 port, and mounting interface, but features an upgraded two Y-shaped piston seal for lower start-up pressure.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. It delivers 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 force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX350S replacement — usually within 7-8 hours.