This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX125, 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 SI63BX125
The AirTAC Airtac SI63 Standard Cylinder SI63BX125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX125
- 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 SI63BX125
The AirTAC SI63BX125 is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod for corrosion resistance. It delivers 1559 N push force at 0.5 MPa through its G3/8 port. The direct replacement is the SAI63BX125, matching the exact bore, stroke, force, and ISO 15552 mounting interface.
Because this SKU lacks a magnet, it cannot accept a sensor. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63BX125 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX125 |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAI63BX125 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 SAI63BX125 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 SI63BX125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SI63BX125 Is Used
Washdown Handling
Ideal for food or chemical stations using the SUS304 rod to resist moisture while pushing 1559 N at 0.5 MPa.
Package Diverting
Provides robust 125 mm stroke actuation to push medium cartons off a main belt at up to 800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63BX125 with the SAI63BX125
To replace the SI63BX125, order the SAI63BX125. Verify the ISO 15552 mounting interface, 125 mm stroke, G3/8 port, and SUS304 rod option. Note this non-magnetic SKU cannot support switches. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. A standard cylinder drifts on air loss as cushions only decelerate; for load holding, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX125
- ✓ 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 SI63BX125 FAQ
Yes, the SI63BX125 is discontinued. The direct replacement is the SAI63BX125. It shares the identical ISO 15552 mounting interface, bore, stroke, force, G3/8 port, and SUS304 rod material, fitting existing fixtures perfectly.
This double-acting cylinder uses a G3/8 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 maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX125
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX125 replacement — usually within 7-8 hours.