DRILL AND TAPPING CHART
BSW Whitworth
UNC UNS*
UNF UNS*
Metric ISO Course
Metric ISO Fine
BSF
BA
Metric Conduit
BSPT (Taper Pipe)
NPT (Taper Pipe)
NPS (Parallel Pipe)
BSPF (Parallel Pipe)
Brass
> Spark Plug
BS Conduit
Spark Plug
60° thread form
Size inch
Threads per inch
Tapping Drill Sizes
Preferred mm - inch
Alternative mm - inch
10.0
1.00
23/64
9.0
12.0
1.25
10.5
13/32
14.0
12.5
18.0
1.50
41/64
Please note : Tradezone Ltd accepts no liability for any loss or damage either direct or consequential aising out of or in relation to the use or application of the information or products referred to herein.
