C&K Part Numbering D6 Series Pushbutton

What is the “LFS” at the end of part number D6C90 F1 LFS?

“LFS” is calling out RoHS compliant and compatible product.

Below is a complete part number break down for D6C90 F1 LFS from the “How to Order” section in the D6 series data sheet. For more details see the appropriate manufacturer’s datasheet.