Example - Typical designation of an UNC thread
UNF threads ANSI B1.1:
|Major Diameter |
|Threads per inch|
|Major Diameter||Tap Drill Size |
|#0 - 80||80||0.060||1.524||1.25||0.317|
|#1 - 72||72||0.073||1.854||1.55||0.353|
|#2 - 64||64||0.086||2.184||1.90||0.397|
|#3 - 56||56||0.099||2.515||2.15||0.453|
|#4 - 48||48||0.112||2.845||2.40||0.529|
|#5 - 44||44||0.125||3.175||2.70||0.577|
|#6 - 40||40||0.138||3.505||2.95||0.635|
|#8 - 36||36||0.164||4.166||3.50||0.705|
|#10 - 32||32||0.190||4.826||4.10||0.794|
|#12 - 28||28||0.216||5.486||4.70||0.907|
|1/4" - 28||28||0.250||6.350||5.50||0.907|
|5/16" - 24||24||0.313||7.938||6.90||1.058|
|3/8" - 24||24||0.375||9.525||8.50||1.058|
|7/16" - 20||20||0.438||11.112||9.90||1.270|
|1/2" - 20||20||0.500||12.700||11.50||1.270|
|9/16" - 18||18||0.563||14.288||12.90||1.411|
|5/8" - 18||18||0.625||15.875||14.50||1.411|
|3/4" - 16||16||0.750||19.050||17.50||1.587|
|7/8" - 14||14||0.875||22.225||20.40||1.814|
|1" - 12||12||1.000||25.400||23.25||2.117|
|1 1/8" - 12||12||1.125||28.575||26.50||2.117|
|1 1/4" - 12||12||1.250||31.750||29.50||2.117|
|1 3/8" - 12||12||1.375||34.925||32.75||2.117|
|1 1/2" - 12||12||1.500||38.100||36.00||2.117|
Example - Typical designation of an UNF thread
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