This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX340S, 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 SI63BX340S
The AirTAC Airtac SI63 Standard Cylinder SI63BX340S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 340mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX340S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke340 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX340S
- 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 SI63BX340S
The AirTAC SI63BX340S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 340mm stroke, and a SUS304 stainless steel rod. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this with the SAI63BX340S direct upgrade, retaining identical ISO 15552 mounting, force, and stroke. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
This -B rod variant offers corrosion resistance, while the -S magnet supports CS1-B/DS1-B legacy sensors. The SAI family adds SAIL, SAIF, and BSAI lock variants. Note that plain cylinders drift without air; use an external rod lock for holding.
Airtac SI63 Standard Cylinder SI63BX340S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX340S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX340S |
| Bore size | Ø63 mm |
| Stroke | 340 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 SAI63BX340S 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 SAI63BX340S 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 SI63BX340S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×340 | 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 SI63BX340S Is Used
Stainless Rod Diverter
Ideal for diverting items on a washdown conveyor line where the SUS304 rod resists moisture and the 340mm stroke spans the belt.
Pneumatic Press Ejector
Ejects pressed parts using the 63mm bore force class, relying on adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63BX340S with the SAI63BX340S
To replace the SI63BX340S, order the SAI63BX340S. Verify the ISO 15552 interface, 340mm stroke, G3/8 port, and M16x1.5 thread. The -B denotes a SUS304 rod, and -S denotes the magnet for CS1-B/DS1-B switches. For loads needing 2805N at 0.9MPa, step up to an 80mm bore; if 1559N suffices, a 50mm bore works. At 340mm stroke, use external guides to prevent rod bending. Plain cylinders drift on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX340S
- ✓ 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 SI63BX340S FAQ
Yes, the SI63BX340S is discontinued. The direct replacement is the SAI63BX340S. It shares the identical ISO 15552 mounting interface, 63mm bore, 340mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
It features a G3/8 air port and delivers 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a max force of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX340S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX340S replacement — usually within 7-8 hours.