[Shane1234]

shane I think i know what secos wnmg your talking about those are fantastic inserts, they last longer then the sanviks for 9310 gear steel and 1045 too. I use them for rough cause I get alot more parts per inserts.
I got like 1 box left.
BTW were do you get the seco the place I used to get them locally closed many years ago.and I havent looked for a new place yet

we get seco from deco tool
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the main problem we have with inserts is jumping from sqaure shaft to round bar to hex, etc, in stainless steel. the 1125 grade sandviks take the abuse of the interrupted cut and keeps on chugging.

we do use the cheaper mitsubishi inserts when we machine 1018, 1045, and 4140, as those seem to handle it just fine.

any insert works for delryn, but we have some sharp edge prep non coated inserts for uhmw to help from stringing up.