This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX75S, 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 SI63BX75S
The AirTAC Airtac SI63 Standard Cylinder SI63BX75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 75mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke75 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX75S
- 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 SI63BX75S
The AirTAC SI63BX75S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 75mm stroke, and a SUS304 stainless piston rod for corrosion resistance. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is replaced by the SAI63BX75S. This direct successor matches the exact mounting interface, bore, stroke, force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX75S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX75S |
| Bore size | Ø63 mm |
| Stroke | 75 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 SAI63BX75S 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 SAI63BX75S 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 SI63BX75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×75 | 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 SI63BX75S Is Used
Stainless Rod Clamping
Ideal for packaging lines requiring washdown resistance, using the SUS304 rod to actuate clamping arms with 1559N force.
Replacing the Airtac SI63 Standard Cylinder SI63BX75S with the SAI63BX75S
To replace the SI63BX75S, order the SAI63BX75S direct, verifying the ISO 15552 mounting interface, 75mm stroke, G3/8 port, and your specific mounting accessory. The -B rod is SUS304 stainless steel, and the -S magnet supports legacy CS1-B/DS1-B switches. Sizing both ways: this bore yields 1559N push at 0.5MPa, whereas a neighbouring 50mm bore provides 982N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 75mm stroke, side-load risks are minimal, but always ensure rigid guidance for the 20mm rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX75S
- ✓ 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 SI63BX75S FAQ
Yes, the SI63BX75S is discontinued. The direct replacement is the SAI63BX75S. It is dimensionally interchangeable per ISO 15552, maintaining the same 63mm bore, 75mm stroke, G3/8 port, and mounting interface.
The G3/8 port feeds a 20mm piston rod delivering 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and a maximum theoretical force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX75S replacement — usually within 7-8 hours.