This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX135, 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 SI63BX135
The AirTAC Airtac SI63 Standard Cylinder SI63BX135 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 135mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX135, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke135 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX135
- 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 SI63BX135
The AirTAC SI63BX135 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 135 mm stroke, and SUS304 stainless steel rod. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is directly replaced by the SAI63BX135. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because this SKU lacks a magnet (-S), it cannot accept a position sensor like the legacy CS1-B/DS1-B switches. The -B rod material provides corrosion resistance compared to standard carbon steel, and Viton H seals can raise the operating temperature to 150 C. The SAI family also introduces lock and valve variants absent in the SI line, including the SAIL, BSAI, and SAIF models.
Airtac SI63 Standard Cylinder SI63BX135 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX135 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX135 |
| Bore size | Ø63 mm |
| Stroke | 135 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 SAI63BX135 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 SAI63BX135 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 SI63BX135
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×135 | 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 SI63BX135 Is Used
Stainless Rod Clamping
Ideal for packaging machinery requiring corrosion resistance, using the SUS304 rod to clamp parts with 1559 N of force at 0.5 MPa.
Transfer Diverters
Actuates routing gates on conveyor lines with a 135 mm stroke, benefiting from the direct replacement SAI63BX135 ISO 15552 mounting compatibility.
Replacing the Airtac SI63 Standard Cylinder SI63BX135 with the SAI63BX135
To replace the discontinued SI63BX135, order the SAI63BX135. Confirm the ISO 15552 mounting interface, 63 mm bore, 135 mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). Since this is a no-S SKU, it cannot support magnetic sensing; if position detection is needed, switch to an SAI63X135S model with current AirTAC switches. Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa, while the neighboring 80 mm bore provides 2513 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or explore the SAIL/BSAI lock variants. The 135 mm stroke is under 300 mm, so rod-bending side loads are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX135
- ✓ 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 SI63BX135 FAQ
Yes, the AirTAC SI63BX135 is discontinued. The direct replacement is the SAI63BX135. It shares the same ISO 15552 mounting interface, 63 mm bore, 135 mm stroke, output force, G3/8 port, and SUS304 rod, fitting existing fixtures perfectly.
This 63 mm bore 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX135
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX135 replacement — usually within 7-8 hours.