This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX1550S, 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 SI63BX1550S
The AirTAC Airtac SI63 Standard Cylinder SI63BX1550S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1550mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX1550S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1550 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX1550S
- 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 SI63BX1550S
The AirTAC SI63BX1550S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 1550 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX1550S, matching the interface, stroke, force and mounting. Note that 1550 mm exceeds the 1500 mm standard maximum, making this a non-standard, made-to-order stroke.
This unit features a SUS304 stainless steel rod (-B) and a piston magnet (-S) for CS1-B/DS1-B switches. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. For high temps, Viton H seals raise the limit to 150 C.
Airtac SI63 Standard Cylinder SI63BX1550S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX1550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX1550S |
| Bore size | Ø63 mm |
| Stroke | 1550 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 SAI63BX1550S 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 SAI63BX1550S 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 SI63BX1550S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1550 | 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 SI63BX1550S Is Used
Long-Stroke Transfer
Pushes workpieces between automated machining stations over a 1550 mm travel distance using the 1559 N push force at 0.5 MPa.
Corrosive Environment Actuation
Drives tooling mechanisms in washdown or chemical areas utilizing the SUS304 stainless piston rod for maximum corrosion resistance.
Replacing the Airtac SI63 Standard Cylinder SI63BX1550S with the SAI63BX1550S
To replace the SI63BX1550S, order the SAI63BX1550S, confirming the ISO 15552 mounting interface, G3/8 port, M16x1.5 thread, and mounting accessory. The -B SUS304 rod and -S magnet must be specified. Sizing both ways: a 50 mm bore yields 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. This cylinder does not hold load without live air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for hold. Because the 1550 mm stroke exceeds the 1500 mm standard and is non-standard, external guides are critical to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX1550S
- ✓ 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 SI63BX1550S FAQ
Yes, the SI63BX1550S is discontinued. The direct replacement is the SAI63BX1550S. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63 mm bore, 1550 mm stroke, output force, G3/8 port, and mounting fixtures.
This double-acting cylinder uses a G3/8 air port. 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX1550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX1550S replacement — usually within 7-8 hours.