This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX35S, 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 SI63BX35S
The AirTAC Airtac SI63 Standard Cylinder SI63BX35S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 35mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX35S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke35 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX35S
- 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 SI63BX35S
The AirTAC SI63BX35S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 35mm stroke, and a SUS304 stainless steel piston rod. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63BX35S. This direct upgrade shares the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
For high-heat environments, Viton H seals raise the operating range to 150 C. Note that a standard cylinder drifts without live air; use the SAIL lock or a pilot check valve for load holding.
Airtac SI63 Standard Cylinder SI63BX35S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX35S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX35S |
| Bore size | Ø63 mm |
| Stroke | 35 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 SAI63BX35S 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 SAI63BX35S 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 SI63BX35S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×35 | 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 SI63BX35S Is Used
Stainless Rod Clamping
Ideal for packaging machines requiring corrosion resistance, using the SUS304 rod to clamp parts reliably with 1559 N force at 0.5 MPa.
Short-Stroke Diverting
The 35mm stroke provides rapid actuation for diverting lightweight goods on processing lines, operating at speeds between 30-800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63BX35S with the SAI63BX35S
To replace the discontinued SI63BX35S, order the SAI63BX35S, matching the 63mm bore, 35mm stroke, G3/8 port, and ISO 15552 mounting. The -B rod is SUS304 stainless steel, and the -S magnet works with CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If you need more force, the 80mm bore yields 2513 N push at 0.5 MPa; if less is needed, the 50mm bore provides 982 N. For load holding on air loss, remember the cushion only decelerates; use the SAIL lock, BSAI clamp-lock, or an external pilot check valve. The SAIF variant offers a built-in valve for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX35S
- ✓ 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 SI63BX35S FAQ
Yes, the SI63BX35S is discontinued. The direct replacement is the SAI63BX35S, which shares the same ISO 15552 mounting interface, 63mm bore, 35mm stroke, force, G3/8 port, and SUS304 rod.
The 63mm bore features a G3/8 port and M16x1.5 rod thread. It delivers 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 max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX35S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX35S replacement — usually within 7-8 hours.