Hello Jeff! Thank you for your inquiry. Yes, the Guide Bar Nuts are compatible with the CS-352.
Yes, they fit...they just don’t stay tight
Yes. The larger nuts should fit it. They are the M8-1.25 flange nut.
Yes. The smaller nuts are the M6 nuts for the chain bar. The larger nuts are for bigger model saws that have 18 or 20 inch bars.
Yes. It will be the 2 larger M8 flange nuts. See # 10 on page 15 of the replacement parts list - https://www.echo-usa.com/getattachment/678ca14c-4e49-486a-b66c-4c70b0c9159f/CS-490_C68315_051517_es
No, the Guide Bar Nuts, Part #90250Y, does not work with the CS-301.
Yes, the Chainsaw Guide Bar Nuts, Part #90250Y, are compatible with the CS-400.
ECHO would recommended contacting the manufacturer, Blue Max, with the specifications for the Guide Bar Nuts to confirm if they are compatible with your model.
Yes, the CS-490 is compatible with the Guide Bar Nuts, Part #90250Y.
Hi! Thank you for your inquiry. The guide bar nuts are designed to work with the ECHO Chainsaws only.