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 ::16-UN Thread (USA)  :: Sharp V Thread (USA)  ::BA British Association (GB)  :: BSF Whitworth Fine Thread(GB)
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UNEF Threads ANSI B1.1

Specifications of International Thread Standards

       UNEF - Unified Extra Fine Thread, which is used for special purposes.
Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPI Pitch
mm
N 12 - 32 UNEF 0,216 5,486 4,80 32 0,794
1/4" - 32 UNEF 0,250 6,350 5,70 32 0,794
5/16" - 32 UNEF 0,313 7,938 7,25 32 0,794
3/8" - 32 UNEF 0,375 9,525 8,85 32 0,794
7/16" - 28 UNEF 0,438 11,112 10,35 28 0,907
1/2" - 28 UNEF 0,500 12,700 11,80 28 0,907
9/16" - 24 UNEF 0,563 14,288 13,40 24 1,058
5/8" - 24 UNEF 0,625 15,875 15,00 24 1,058
11/16" - 24 UNEF 0,688 17,462 16,60 24 1,058
3/4" - 20 UNEF 0,750 19,050 18,00 20 1,270
13/16" - 20 UNEF 0,813 20,638 19,60 20 1,270
7/8" - 20 UNEF 0,875 22,225 21,15 20 1,270
15/16" - 20 UNEF 0,938 23,812 22,70 20 1,270
1" - 20 UNEF 1,000 25,400 24,30 20 1,270
1 1/16" - 18 UNEF 1,063 26,988 25,80 18 1,411
1 1/8" - 18 UNEF 1,125 28,575 27,35 18 1,411
1 1/4" - 18 UNEF 1,250 31,750 30,55 18 1,411
1 5/16" - 18 UNEF 1,313 33,338 32,10 18 1,411
1 3/8" - 18 UNEF 1,375 34,925 33,70 18 1,411
1 7/16" - 18 UNEF 1,438 36,512 35,30 18 1,411
1 1/2" - 18 UNEF 1,500 38,100 36,90 18 1,411
1 9/16" - 18 UNEF 1,563 39,688 38,55 18 1,411
1 5/8" - 18 UNEF 1,625 41,275 40,10 18 1,411
1 11/16" - 18 UNEF 1,688 42,862 41,60 18 1,411

UNEF Thread
 

 

© 1998 Conex Metals

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