Serge, Try
-428A1/4-28 It is in the AS catalog, search for an365 and you will find it. There is a time for building and a time for FLYING and the time for building has expired. See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering You Wrote: I understand that all Nylon insert locknuts have the same part number, which is AN-365 (or AN-364 for a half-height), irrespective of the bolt shank diameter. So, how do you specify that you want, say, an AN4 size?