4 2nd end bolt hole quantity distance between bolt holes along length of second end is 3, 625 in. on oone side, all bolt holes on flange threaded 0.375-16 npt 1st end thread series
3a 1st end thread class 12 1st end thread quantity per inch shoulder 0.700 in. lg, o-ring groove, 2.186 in. dia on bulkhead flange anodize surface treated flanged unj 1st end thread series
3a 1st end thread class 12 1st end thread quantity per inch shoulder 0.220 in. lg, o-ring groove 2.186 in. dia on bulkhead flange anodize surface treated flanged unj 1st end thread series