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THREAD DATA CHARTS

UNC Thread ANSI B1.1

UNC, UNF, & UNEF Thread ANSI B1.1

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UNC Thread ANSI B1.1
UNC - Unified Coarse Thread. The old definition NC - National Coarse is comparable with the metric thread. The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an similar manner to the metric and the ISO metric thread.
Nominal Major Major Tapping TPI Pitch
Diameter Diameter Diameter Drill Size mm
  Inch mm mm  
1 - 64 UNC 0,073 1,854 1,50 64 0,397
2 - 56 UNC 0,086 2,184 1,80 56 0,453
3 - 48 UNC 0,099 2,515 2,10 48 0,529
4 - 40 UNC 0,112 2,845 2,35 40 0,635
5 - 40 UNC 0,125 3,175 2,65 40 0,635
6 - 32 UNC 0,138 3,505 2,85 32 0,794
8 - 32 UNC 0,164 4,166 3,50 32 0,794
10 - 24 UNC 0,190 4,826 4,00 24 1,058
12 - 24 UNC 0,216 5,486 4,65 24 1,058
1/4" - 20 UNC 0,250 6,350 5,35 20 1,270
5/16" - 18 UNC 0,313 7,938 6,80 18 1,411
3/8" - 16 UNC 0,375 9,525 8,25 16 1,587
7/16" - 14 UNC 0,438 11,112 9,65 14 1,814
1/2" - 13 UNC 0,500 12,700 11,15 13 1,954
9/16" - 12 UNC 0,563 14,288 12,60 12 2,117
5/8" - 11 UNC 0,625 15,875 14,05 11 2,309
3/4" - 10 UNC 0,750 19,050 17,00 10 2,540
7/8" - 9 UNC 0,875 22,225 20,00 9 2,822
1" - 8 UNC 1,000 25,400 22,85 8 3,175
1 1/8" - 7 UNC 1,125 28,575 25,65 7 3,628
1 1/4" - 7 UNC 1,250 31,750 28,85 7 3,628
1 3/8" - 6 UNC 1,375 43,925 31,55 6 4,233
1 1/2" - 6 UNC 1,500 38,100 34,70 6 4,233
1 3/4" - 5 UNC 1,750 44,450 40,40 5 5,080
2" - 4 1/2 UNC 2,000 50,800 46,30 4,5 5,644
2 1/4" - 4 1/2 UNC 2,250 57,150 52,65 4,5 5,644
2 1/2" - 4 UNC 2,500 63,500 58,50 4 6,350
2 3/4" - 4 UNC 2,750 69,850 64,75 4 6,350
3" - 4 UNC 3,000 63,500 71,10 4 6,350
3 1/4" - 4 UNC 3,250 82,550 77,45 4 6,350
3 1/2" - 4 UNC 3,500 88,900 83,80 4 6,350
3 3/4" - 4 UNC 3,750 95,250 90,15 4 6,350
4" - 4 UNC 4,000 101,600 96,50 4 6,350
UNC Thread

 

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