This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX35, 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 SI63BX35
The AirTAC Airtac SI63 Standard Cylinder SI63BX35 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 SAI63BX35, 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 → SAI63BX35
- 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 SI63BX35
The AirTAC SI63BX35 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 35 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX35, which matches the bore, stroke, force, port and ISO 15552 mounting interface. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and adds SAIL, SAIF and BSAI variants the SI lacked.
This specific SKU uses a SUS304 stainless steel rod for corrosion resistance. As it lacks the -S magnet, it cannot accept a sensor. Note that a plain cylinder drifts without air; use a pilot check valve or SAIL lock for load holding.
Airtac SI63 Standard Cylinder SI63BX35 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX35 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX35 |
| 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 SAI63BX35 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 SAI63BX35 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 SI63BX35
| 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 SI63BX35 Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS304 rod to clamp parts firmly with 1559 N of push force.
Short-Stroke Diversion
Provides robust 35 mm actuation for diverting packages or positioning stops on a washdown-resistant production line.
Press Ejection
Delivers rapid 30-800 mm/s ejection of manufactured components from press beds, leveraging the ISO 15552 mounting interface.
Replacing the Airtac SI63 Standard Cylinder SI63BX35 with the SAI63BX35
To replace the SI63BX35, order the SAI63BX35. Confirm the ISO 15552 mounting interface, 63 mm bore, 35 mm stroke, G3/8 port (PT/G/NPT thread) and mounting accessory. This SKU has a SUS304 stainless rod and no -S suffix, meaning it cannot accept a magnetic switch; if sensing is needed, select an SAI63X35S and use current AirTAC switches. The 63 mm bore yields 1559 N push at 0.5 MPa; neighbouring bores are 50 mm (982 N) and 80 mm (2513 N). The air cushion only decelerates the piston; it does not hold load. For drop prevention on air loss, specify an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX35
- ✓ 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 SI63BX35 FAQ
Yes, the AirTAC SI63BX35 is discontinued. The direct replacement is the SAI63BX35. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 35 mm stroke, 1559 N force, G3/8 port and mounting interface.
The 63 mm bore uses a G3/8 port. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa. The rod is 20 mm with an M16x1.5 thread.
Request a Quote for the SAI63BX35
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX35 replacement — usually within 7-8 hours.