ANSI Machine taps Type Str Flt Str Flt Str Flt Spiral Pt Spiral Flt Taper Plug Bottom Bottom Bottom Type of hole TH=Through Hole, BH=Blind Hole TH TH/BH TH/BH TH BH Standard ANSI B94 Surface BRIGHT BRIGHT BRIGHT BLACK OXIDE BRIGHT Length of chamfer lead(thread) 8-10 4-5 1.5-2.5 4-5 1.5-2.5 Application Steel,stainless steel, cast iron,copper,aluminum Steel,stainless steel, cast iron,copper,aluminum Steel,stainless steel, cast iron,copper,aluminum Steel, stainless steel,copper, aluminum Steel, stainless steel,aluminum Size TPI Series l1 l2 Part number Part number Part number Part number Part number inch inch 4 40 UNC 1 7/8 9/16 1538001 1538002 1538003 1148001 1149001 4 48 UNF 1 7/8 9/16 5 40 UNC 1 15/16 5/8 1538004 1538005 1538006 1148002 1149002 5 44 UNF 1 15/16 5/8 6 32 UNC 2 11/16 1538007 1538008 1538009 1148003 1149003 6 40 UNF 2 11/16 8 32 UNC 2 1/8 3/4 1538010 1538011 1538012 1148004 1149004 8 36 UNF 2 1/8 3/4 10 24 UNC 2 3/8 7/8 1538013 1538014 1538015 1148005 1149005 10 32 UNF 2 3/8 7/8 1538016 1538017 1538018 1148006 1149006 12 24 UNC 2 3/8 15/16 1538019 1538020 1538021 1148007 1149007 1/4 20 UNC 2 1/2 1 1538022 1538023 1538024 1148008 1149008 1/4 28 UNF 2 1/2 1 1538025 1538026 1538027 1148009 1149009 5/16 18 UNC 2 23/32 1 1/8 1538028 1538029 1538030 1148010 1149010 5/16 24 UNF 2 23/32 1 1/8 1538031 1538032 1538033 1148011 1149011 3/8 16 UNC 2 15/16 1 1/4 1538034 1538035 1538036 1148012 1149012 3/8 24 UNF 2 15/16 1 1/4 1538037 1538038 1538039 1148013 1149013 7/16 14 UNC 3 5/32 1 7/16 1538040 1538041 1538042 1148014 1149014 7/16 20 UNF 3 5/32 1 7/16 1538043 1538044 1538045 1148015 1149015 1/2 13 UNC 3 3/8 1 21/32 1538046 1538047 1538048 1148016 1149016 1/2 20 UNF 3 3/8 1 21/32 1538049 1538050 1538051 1148017 1149017 9/16 12 UNC 3 19/32 1 21/32 1538052 1538053 1538054 ─ ─ 9/16 18 UNF 3 19/32 1 21/32 1538055 1538056 1538057 ─ ─ 5/8 11 UNC 3 13/16 1 13/16 1538058 1538059 1538060 1148020 1149020 5/8 18 UNF 3 13/16 1 13/16 1538061 1538062 1538063 1148021 ─ 3/4 10 UNC 4 1/4 2 1538064 1538065 1538066 1148022 ─ 3/4 16 UNF 4 1/4 2 1538067 1538068 1538069 ─ ─
