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 :: Specifications  :: Camera-mount  :: ISO Fine Thread  :: ISO Coarse Thread
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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


BA threads British Association  Threads

Specifications of International Thread Standards

       British Association Standard Thread. Used for instruments and clocks. Replaced by the metric ISO thread and the ISO fine thread.
BA Thread-
No.
Diameter
mm
Tapping Drill Size
mm
Pitch
mm
BA No. 0 6,00 4,80 1,00
BA No. 1 5,30 4,22 0,90
BA No. 2 4,70 3,73 0,81
BA No. 3 4,10 3,22 0,73
BA No. 4 3,60 2,81 0,66
BA No. 5 3,20 2,49 0,59
BA No. 6 2,80 2,16 0,53
BA No. 7 2,50 1,92 0,48
BA No. 8 2,20 1,68 0,43
BA No. 9 1,43 1,9 0,39
BA No. 10 1,70 1,28 0,35
BA No. 11 1,50 1,13 0,31
BA No. 12 1,30 0,96 0,28
BA No. 13 1,20 0,90 0,25
BA No. 14 1,00 0,72 0,23
BA No. 15 0,90 0,65 0,21
BA No. 16 0,79 0,65 0,19
BA No. 17 0,70 0,50 0,17
BA No. 18 0,62 0,44 0,15
BA No. 19 0,54 0,37 0,14
BA No. 20 0,48 0,34 0,12
BA No. 21 0,42 0,29 0,11
BA No. 22 0,37 0,25 0,098
BA No. 23 0,33 0,22 0,098
BA No. 24 0,29 0,19 0,800
BA No. 25 0,25 0,16 0,072

BA-Thread
 

 

© 1998 Conex Metals.

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