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 :: 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


UNF Threads ANSI B1.1

Specifications of International Thread Standards

       UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary screws and nuts.
Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPI Pitch
mm
N 0 - 80 UNF 0,060 1,524 1,25 80 0,317
N 1 - 72 UNF 0,073 1,854 1,55 72 0,353
N 2 - 64 UNF 0,068 2,184 1,90 64 0,397
N 3 - 56 UNF 0,099 2,515 2,15 56 0,453
N 4 - 48 UNF 0,112 2,845 2,40 48 0,529
N 5 - 44 UNF 0,125 3,175 2,70 44 0,577
N 6 - 40 UNF 0,138 3,505 2,95 40 0,635
N 8 - 36 UNF 0,164 4,166 3,50 36 0,705
N 10 - 32 UNF 0,190 4,826 4,10 32 0,794
N 12 - 28 UNF 0,216 5,486 4,70 28 0,907
1/4" - 28 UNF 0,250 6,350 5,50 28 0,907
5/16" - 24 UNF 0,313 7,938 6,90 24 1,058
3/8" - 24 UNF 0,375 9,525 8,50 24 1,058
7/16" - 20 UNF 0,438 11,112 9,90 20 1,270
1/2" - 20 UNF 0,500 12,700 11,50 20 1,270
9/16" - 18 UNF 0,563 14,288 12,90 18 1,411
5/8" - 18 UNF 0,625 15,875 14,50 18 1,411
3/4" - 16 UNF 0,750 19,050 17,50 16 1,587
7/8" - 14 UNF 0,875 22,225 20,40 14 1,814
1" - 12 UNF 1,000 25,400 23,25 12 2,117
1 1/8" - 12 UNF 1,125 28,575 26,50 12 2,117
1 1/4" - 12 UNF 1,250 31,750 29,50 12 2,117
1 3/8" - 12 UNF 1,375 43,925 32,75 12 2,117
1 1/2" - 12 UNF 1,500 38,100 36,00 12 2,117

UNF Thread
 
© 1998 Conex Metals.

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