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 :: Specifications  :: Camera-mount  :: ISO Fine Thread  :: ISO Coarse Thread
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 :: Knuckle Thread DIN  20400  :: Buttress Fine Thread  :: Buttress Coarse Thread  :: Trapezoidal Fine Thread
 :: Trapezoidal Coarse Thread   :: NPT Thread (USA)  :: NPTF Thread (USA)  :: UNC Thread (USA)
 :: UNEF Thread   :: UNF Thread :: 8-UN Thread (USA)  :: 12-UN Thread (USA)
 ::16-UN Thread (USA)  :: Sharp V Thread (USA)  ::BA British Association (GB)  :: BSF Whitworth Fine Thread(GB)
 :: BSW Whitworth Coarse Thread(GB)  :: BSP Whitworth Pipe Thread(GB)  :: BSPT Tapered Whit - worth Pipe Thread(GB)  :: Conversion Inch-Fractals to mm


UNC Threads ANSI B1.1

Specifications of International Thread Standards

       UNC - Unified Coarse Thread. The old definition NC 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 analogous manner like the metric and the ISO metric thread.
Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPI Pitch
mm
N 1 - 64 UNC 0,073 1,854 1,50 64 0,397
N 2 - 56 UNC 0,086 2,184 1,80 56 0,453
N 3 - 48 UNC 0,099 2,515 2,10 48 0,529
N 4 - 40 UNC 0,112 2,845 2,35 40 0,635
N 5 - 40 UNC 0,125 3,175 2,65 40 0,635
N 6 - 32 UNC 0,138 3,505 2,85 32 0,794
N 8 - 32 UNC 0,164 4,166 3,50 32 0,794
N 10 - 24 UNC 0,190 4,826 4,00 24 1,058
N 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 76,200 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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