Drill and Tapping Chart

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DRILL AND TAPPING CHART


		BSW Whitworth		UNC UNS*	UNF UNS*
		BSW Whitworth
		Metric ISO Course		Metric ISO Fine	BSF
					BSF


	BA			Metric Conduit	BSPT (Taper Pipe)


			NPT (Taper Pipe)		NPS (Parallel Pipe)
		BSPF (Parallel Pipe)


	Brass		Spark Plug		> BS Conduit

BS Conduit

55° thread form

Size inch	Threads per inch	Tapping Drill Sizes
		Preferred mm - inch	Alternative mm - inch

5/8	18			14.25	9/16
3/4	16			17.0	43/64
1	16			23.5	59/64
1-1/4	16			30.0	1-11/64
1-1/2	14			36.0
2	14			48.5


		BSW Whitworth		UNC UNS*	UNF UNS*
		BSW Whitworth
		Metric ISO Course		Metric ISO Fine	BSF
					BSF


	BA			Metric Conduit	BSPT (Taper Pipe)


			NPT (Taper Pipe)		NPS (Parallel Pipe)
		BSPF (Parallel Pipe)


	Brass		Spark Plug		> BS Conduit



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