This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX155, 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 SI63BX155
The AirTAC SI63 Standard Cylinder SI63BX155 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 155mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX155, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke155 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX155
- 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 SI63BX155
The AirTAC SI63BX155 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 155 mm stroke. It delivers a thrust of 1559 N at 0.5 MPa through its G3/8 port. The direct replacement is the SAI63BX155, sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port size. This SKU features a SUS304 stainless steel rod for corrosion resistance but lacks a magnet, so it cannot accept a position switch.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements, ensuring low start-up pressure and extended life. Note that this standard cylinder will drift on air loss; for load holding, consider the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX155 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX155 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX155 |
| Bore size | Ø63 mm |
| Stroke | 155 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 SAI63BX155 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 SAI63BX155 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 SI63BX155
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×155 | 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 SI63BX155 Is Used
Stainless Rod Clamping
Ideal for packaging machines requiring corrosion resistance, using the SUS304 rod to clamp parts securely with 1559 N of force.
Transfer Diverters
Actuates diverting gates on conveyor lines, providing reliable 155 mm stroke movement for product routing without needing position sensing.
Material Stops
Functions as a heavy-duty pneumatic stop in material handling systems, holding pallets temporarily with its 63 mm bore thrust.
Replacing the Airtac SI63 Standard Cylinder SI63BX155 with the SAI63BX155
To replace the discontinued SI63BX155, order the SAI63BX155. Verify the ISO 15552 mounting interface, the 63 mm bore, 155 mm stroke, G3/8 port, and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the S suffix. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. The 155 mm stroke is below the 300 mm threshold, so rod-bending side-load risks are minimal. Remember that the air cushion only decelerates the piston at stroke ends and does not hold the load—if you need static holding on air loss, use an external pilot check valve or explore the SAIL air-released lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX155
- ✓ 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 SI63BX155 FAQ
Yes, the SI63BX155 is discontinued. The direct replacement is the SAI63BX155. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 155 mm stroke, G3/8 port, and mounting interface.
This 63 mm bore double-acting cylinder features a G3/8 air port and a 20 mm SUS304 piston rod. It delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. At 0.7 MPa the push force is 2182 N, and the theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX155
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