UNC (Coarse Thread) TAP SIZE DRILL SIZE #0-80 #56 (0.046”) #1-64 #53 (0.0595”) #2-56 #50 (0.070”) #3-48 #50 (0.070”) #4-40 #43 (0.089”) #5-40 #38 (0.1015”) #6-32 #36 (0.1065”) #8-32 #29 (0.136”) #10-24 #25 (0.1495”) #12-24 #16 (0.173”) 1/4-20 #7 (0.201”) 5/16-18 F (0.257”) 3/8-16 5/16 (0.3125”) 7/16-14 U (0.368”) 1/2-13 27/64 (0.4219”) 9/16-12 31/64 (0.4844”)…