This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX250H, 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 SI63BX250H
The AirTAC Airtac SI63 Standard Cylinder SI63BX250H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX250H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX250H
- 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 SI63BX250H
The AirTAC SI63BX250H is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore and 250mm stroke. Built with an extruded aluminum barrel and a SUS304 stainless steel piston rod, it delivers 1559 N push force at 0.5 MPa through its G3/8 port. Because this legacy SI unit is end-of-life, you should order the SAI63BX250H direct replacement, which matches the bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI successor retains all dimensional ratings but incorporates an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific SKU includes a Viton H seal for 0-150 C high-temperature environments but lacks a magnet, meaning it cannot accept position switches.
Airtac SI63 Standard Cylinder SI63BX250H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX250H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX250H |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAI63BX250H 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 SAI63BX250H 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 SI63BX250H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SI63BX250H Is Used
High-Temp Actuation
Drives mechanisms in 0-150 C thermal environments using the Viton H seal and SUS304 rod for reliable high-temperature resistance.
Replacing the Airtac SI63 Standard Cylinder SI63BX250H with the SAI63BX250H
To replace the discontinued SI63BX250H, order the SAI63BX250H. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 63mm bore, 250mm stroke, G3/8 port, and Viton H high-temp seal. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select a magnet-equipped SAI model. When sizing, this bore yields 1559 N push at 0.5 MPa; dropping to a 50mm bore gives 982 N, while stepping up to an 80mm bore provides 2513 N. Note that a standard cylinder drifts without live air—the cushion only decelerates end-of-stroke motion—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding. At 250mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX250H
- ✓ 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 SI63BX250H FAQ
Yes, the SI63BX250H is discontinued. The direct replacement is the SAI63BX250H. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 250mm stroke, G3/8 port, and mounting interface, but features an upgraded two Y-shaped element piston seal for longer life.
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, and 2805 N push at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX250H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX250H replacement — usually within 7-8 hours.