Why is the board hole for the wider leg of MF contact A smaller than the board hole for the narrower leg of MF contact A, in case of FX18 series header and receptacle?

Modified on Fri, Jun 26 at 12:45 PM

The hole size is reduced to stabilize the connector to PCB and prevent connector
from mis-position and rotation during mounting process.
Please refer to FX18 Design Guide Line, 3.3 Recommended Land Pattern in our homepage.
https://www.hirose.com/product/document?clcode=&productname=&series=FX18&documenttype=Guideline&lang=ja&documentid=D86_en