This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX165S, 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 SI63BX165S
The AirTAC Airtac SI63 Standard Cylinder SI63BX165S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 165mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX165S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke165 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX165S
- 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 SI63BX165S
The AirTAC SI63BX165S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 165mm stroke, and a SUS304 stainless steel rod. It delivers 1559 N push force at 0.5 MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI63BX165S, a direct replacement matching the ISO 15552 mounting interface, bore, output force, and cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX165S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX165S |
| Bore size | Ø63 mm |
| Stroke | 165 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 SAI63BX165S 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 SAI63BX165S 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 SI63BX165S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×165 | 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 SI63BX165S Is Used
Stainless Rod Actuation
Ideal for packaging or food-grade handling where the SUS304 rod resists corrosion while pushing 1559 N at 0.5 MPa.
Mid-Stroke Diverting
The 165mm stroke provides precise 90-degree diverting or gating on medium-duty material handling lines.
Replacing the Airtac SI63 Standard Cylinder SI63BX165S with the SAI63BX165S
To replace the SI63BX165S, order the SAI63BX165S keeping the identical 63mm bore, 165mm stroke, G3/8 port, and M16x1.5 rod thread. Confirm your ISO 15552 mounting accessory (LB, FA, TC) and that the -S magnet is specified for current AirTAC switches. Sizing both ways: a 50mm bore yields 982 N push @0.5 MPa, while an 80mm bore yields 2513 N. Note that a plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 165mm stroke, rod bending is low, but always guide side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX165S
- ✓ 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 SI63BX165S FAQ
Yes, the SI63BX165S is discontinued. The direct replacement is the SAI63BX165S. It shares the identical ISO 15552 mounting interface, 63mm bore, 165mm stroke, G3/8 port, and SUS304 rod, fitting existing fixtures perfectly.
The bore is 63mm with a G3/8 air port. At 0.5 MPa it provides 1559 N push and 1402 N pull force. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX165S replacement — usually within 7-8 hours.