suggested tap drill sizes British Standard Pipe Parallel or Taper BSP or BSPT

suggested tap drill sizes

British Standard Pipe
Parallel or Taper
BSP or BSPT
Nominal Size
(inches)		T P IMajor Diameter
(inches)		Tapping Drill SizeTapping Drill Size
   BSPBSPT
     
1/16280.3046.6 mm 
 Letter drill G 
1/8280.3838.8 mm 8.4mm
 11/32 inch21/64"
1/4190.51811.8 mm11.2mm
 29/64"7/16"
3/8190.65615.25 mm 14.75mm
 19/32"37/64"
1/2140.82519.00mm18.25mm
 
3/4"		23/32"
5/8140.90221 mm 
 53/64" 
3/4141.04124.5 mm23.75mm
 31/32"15/16"
7/8141.18928.25 mm 
 1-7/64" 
1 inch111.30930.75 mm30mm
 1-13/64"1-11/64"
 1-1/4"11 1.650 39.50 mm38.5mm
 1-35/64"1-33/64"
 1-1/2"111.88245.5 mm44.5mm
 1-25/32"1-3/4"
1-3/4"112.11651.00 mm 
 2" 
2"112.34757 mm56mm
 2-1/4"2-3/16"

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MARYLAND METRICS THREAD DATA CHARTS

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MARYLAND METRICS THREAD DATA CHARTS PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPF PIPE THREAD -- JAPANESE PIPE PARALLEL -- PF JAPANESE CONDUIT THREAD CTG (from 1/2" to 4") British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G) Click here to return to the thread data chart page index. BS EN ISO 228-1: 2003 Table 1 Thread dimensions British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G)   Tolerances on pitch diametera Tolerance on minor diameter Tolerance on major diameter   Diameters Internal thread TD2 External thread Td2 Internal thread TD1 External thread Td Desig-nation of thread Number of threads in 25.4 mm Pitch P Height of thread h major d = D pitch d2 = D2 minor d1 = D1 Lower deviation Upper deviation Lower deviation Class A Lower deviation Class B Upper deviation Lower deviation Upper deviation Lower deviation Upper deviation 1/16 28 0.907 0.581 7.723 7.142 6.561 0 0.107 -0.107 -0.214 0 0 0.282 -0.214 0 1/8 28 0.90...
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FINE PITCH (BSF) BRITISH THREAD DATA CHART

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 FINE PITCH (BSF) BRITISH THREAD DATA CHART Whitworth Fine Thread BS 84 British Standard Fine Thread Series (parallel, cylindrical) BSW and BSF are the Thread selections for commercial screws and nuts. This fine thread, which is widespread in the British machine tool industry, is superseded by the American UNF Thread. THREAD DATA CHART: British Thread (British Standard Fine) -- Fine Pitch Nominal Size BSF Thread Form Type Major Diameter mm d=D Pitch mm p Threads per inch tpi Pitch Diameter mm d2=D2 Minor Diameter Male Thd. d3 Thread Height H1 Tap Drill Diameter mm 3/16" BSF 4.763 0.794 32 4.255 3.747 0.508 4.00 7/32" BSF 5.556 0.907 28 4.975 4.394 0.581 4.60 1/4" BSF 6.350 0.977 26 5.725 5.100 0.625 5.30 9/32" BSF 7.142 0.977 26 6.518 5.893 0.625 6.10 5/16" BSF 7.938 1.156 22 7.199 6.459 0.739 6.80 3/8" BSF 9.525 1.27 20 8.712 7.899 0.813 8.30 7/16" BSF 11.113 1.411 18 10.209 9.304 0.904 9.70 1/2" BSF 12.700 1.588 16 11.684 10.66...
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BSW BRITISH STANDARD COARSE PITCH THREAD CHART

BSW BRITISH STANDARD COARSE PITCH THREAD CHART Whitworth Coarse Thread BS 84 BSW (British Standard Whitworth) British Standard Whitworth Coarse Thread Series (parallel, cylindrical) In GB most common Thread. Corresponds to the Metric Thread in its type of use. THREAD DATA CHART: British Thread (British Standard Whitworth) -- Coarse Pitch Nominal Size Ww Thread Form Type Major Diameter mm d=D Pitch mm p Threads per inch tpi Pitch Diameter mm d2=D2 Minor Diameter Male Thd. d3 Thread Height H1 Tap Drill Diameter mm 1/16" BSW 1.587 0.423 60 1.315 1.050 0.270 1.15 3/32" BSW 2.381 0.529 48 2.041 1.703 0.338 1.90 1/8" BSW 3.175 0.635 40 2.768 2.362 0.406 2.50 5/32" BSW 3.969 0.793 32 3.459 2.952 0.507 3.20 3/16" BSW 4.762 1.058 24 4.084 3.407 0.677 3.70 7/32" BSW 5.556 1.058 24 4.878 4.201 0.677 4.50 1/4" BSW 6.350 1.270 20 5.537 4.724 0.813 5.10 5/16" BSW 7.938 1.411 18 7.034 6.131 0.904 6.50 3/8" BSW 9.525 1.588 16 8.509 7.492 1....
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