4 2nd end bolt hole quantity includes a groove on flange end 0.141 in.dia; 0.047 in.depth; acft model ATF3-6 engine midframe sump module transfer tube installation
2a 1st end thread class 4 2nd end bolt hole quantity 20 1st end thread quantity per inch 2 holes on second end thd 0.138-32unc-2b lubricant dry film surface treated un 1st end thread series
2a 1st end thread class 4 2nd end bolt hole quantity 16 1st end thread quantity per inch with dry film lube anodize surface treated un 1st end thread series
2a 1st end thread class 4 2nd end bolt hole quantity 20 1st end thread quantity per inch with nylock insert anodize surface treated uns 1st end thread series