What size hole do you drill for a 3/8 tap?

What size hole do you drill for a 3/8 tap?

Nominal Size (inches)	T P I	Tapping Drill Size
1/4	19	7/16″
3/8	19	14.75mm
37/64″
1/2	14	18.25mm

What size drill bit do I need for a 3/8 18 tap?

TAPER PIPE SIZES – NPT
TAP SIZE	DRILL SIZE
1/8-27	R
1/4-18	7/16
3/8-18	37/64

What bit do you use for a 3/8 tap?

For a 3/8” NPT Tap, you will need a 37/64” drill bit.

What is the drill size for a 3/8-16 tap?

Most drill charts recommend a 5/16 drill for a 3/8-16 bolt. Cutting holes that are smaller will leave more material for the tap to cut out, risking tap breakage. Drilling larger holes will result in weaker threads, increasing the possibility of stripping them.

What drill is used to tap a 3/8 18 NPT hole?

TAP DRILL SIZE CHART FOR NPT THREADS (National Pipe Threads)

NPT Size	Tap Drill Size (in.)	(Decimal) (in.)
1/8 – 27	“Q”	(0.332)
1/4 – 18	7/16	(0.438)
3/8 – 18	9/16	(0.562)
1/2 – 14	45/64	(0.703)

What size is R drill?

Drill Bit Size Chart

Size	Decimal Equivalent	Size
81	0.013	Q
80	0.0135	8.50 mm
.35 mm	0.0138	8.60 mm
.36 mm	0.0142	R

What size is 8mm drill bit?

Metric Tap and Drill Bit Size Table

Tap	Metric Drill	US Drill
7mm x 1.0	6.1mm	15/64″
8mm x 1.25	6.9mm	17/64″
8mm x 1.0	7.1mm	–
10mm x 1.5	8.7mm	–

What is the size of a tap drill?

designation Pipe Size TPI Tap Drill Size Decimal inch 1/16 – 28 28 1/4 0.2500 1/8 – 28 6mm 28 21/64 0.3281 1/4 – 19 8mm 19 7/16 0.4375 3/8 – 19 10mm 19 9/16 0.5625

What is the size of BSPP/BSPT TPI?

BSPP / BSPT SIZE TPI MAJOR (EXT) MINOR (INT) TAP DRILL 1/8″ 28 9.728 8.566 8.70 1/4″ 19 13.157 11.445 11.60 3/8″ 19 16.662 14.950 15.00 1/2″ 14 20.955 18.631 19.00

What is the BSW drill size for tap?

Tap and Drill Chart – British Standard Whitworth (BSW) Tap size. Drill Size (mm) Drill Size (inch) 1/16-60. 1.15. #56. 3/32-48.

What is the size of a Whitworth tap and drill?

Tap and Drill Chart – British Standard Whitworth (BSW) Tap size Drill Size (mm) Drill Size (inch) 1/4-20 5.00 #9 5/16-18 6.40 1/4 3/8-16 8.00 5/16 7/16-14 9.40 U