This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX135S, 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 SI63BX135S
The AirTAC Airtac SI63 Standard Cylinder SI63BX135S 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 SAI63BX135S, 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 → SAI63BX135S
- 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 SI63BX135S
The AirTAC SI63BX135S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 135mm stroke, and a SUS304 stainless piston rod for corrosion resistance. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63BX135S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement upgrades longevity with two Y-shaped one-way piston seals for low start-up pressure. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors; the SAI family uses current AirTAC switches and adds SAIL lock, SAIF valve, and BSAI clamp-lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63BX135S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX135S |
| 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 SAI63BX135S 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 SAI63BX135S 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 SI63BX135S
| 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 SI63BX135S Is Used
Mid-Stroke Diverting
Provides robust 135mm travel to push products between conveyor lanes, leveraging the adjustable 30mm cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI63 Standard Cylinder SI63BX135S with the SAI63BX135S
To replace the SI63BX135S, order the SAI63BX135S and verify the ISO 15552 mounting interface, 135mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). The -B rod material (SUS304) and -S magnet must be specified on the new order, noting that SAI uses current AirTAC switches instead of the legacy CS1-B/DS1-B. If sizing up or down, the 80mm bore yields 2513N push at 0.5MPa, while the 50mm bore yields 982N. A plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX135S
- ✓ 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 SI63BX135S FAQ
Yes, the SI63BX135S is discontinued. The direct replacement is the AirTAC SAI63BX135S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 135mm stroke, G3/8 port, and mounting interface, but features an upgraded piston seal.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and 2805N push at 0.9MPa. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX135S replacement — usually within 7-8 hours.