STUD...................VARIOUS(5/16" UNC/UNF x 1 5/8")
STUD (UNC/UNF).........VARIOUS(5/16" x 1 7/8" ----- 47.5mm)
NUT (exhaust flange)...VARIOUS(BRASS ===== 5/16" UNF x 1/2")
NUT (exhaust flange)...VARIOUS(BRASS ===== 3/8" UNF x 9/16")