I have several 5/16-18 pointed head bolts, 3/4" long with serrated washers built onto the bolt, that I have removed during disassembly. Does any one know where this bolt is applied? and maybe it's part number?

Thanks
Mat

More info please..
"Pointed head"? as in bevelled head? or do the threads come to a point?

"Serrated washers" as in star washers or "peri teeth" like trunk lid or seat bolts?
(Front bumper to frame washers are also known as "peri teeth".)

What size hex? or do they accept a Phillips screw driver like door latch bolts?

Also what model year car have they come off?

Got a photo?