INCH SIZES - NATIONAL COARSE

----------------------------
TAP		DRILL
SIZE		SIZE
----------------------------
#1-64		#53 
#2-56 		#51 
#3-48 		5/64" 
#4-40 		#43 
#5-40 		#39 
#6-32 		#36 
#8-32 		#29 
#10-24 		#25 
#12-24 		#17 
1/4-20 		#7 
5/16-18 	F 
3/8-16 		5/16 
7/16-14		U 
1/2-13 		27/64 
9/16-12 	31/64 
5/8-11 		17/32 
3/4-10 		21/32 
7/8-9 		49/64 
1"-8 		7/8 
1-1/8-7 	63/64 
1-1/4-7 	1-7/64 
1-1/2-6 	1-11/32 
1-3/4-5 	1-35/64 
2"-4-1/2 	1-25/32

STRAIGHT PIPE SIZES - NPS

----------------------------
TAP	 	DRILL
SIZE 		SIZE
----------------------------
1/8-27 11/32 1/4-18 29/64 3/8-18 19/32 1/2-14 47/64 3/4-14 15/16 1"-11-1/2 1-3/16 1-1/4-11-1/2 1-33/64 1-1/2-11-1/2 1-3/4 2"-11-1/2 2-7/32 2-1/2-8 2-21/32 3"-8 3-9/32 3-1/2-8 3-25/32 4"-8 4-9/32

INCH SIZES - NATIONAL FINE

----------------------------
TAP		DRILL
SIZE 		SIZE
----------------------------
#0-80 		3/64" 
#1-72 		#53
#2-64 		#50
#3-56 		#46
#4-48 		#42
#5-44 		#37
#6-40 		#33
#8-36 		#29
#10-32 		#21
#12-28 		#15
1/4-28 		#3
5/16-24 	I
3/8-24 		Q
7/16-20 	W
1/2-20 		29/64
9/16-18 	33/64
5/8-18 		37/64
3/4-16 		11/16
7/8-14 		13/16
1"-14 		15/16
1-1/8-12 	1-3/64
1-1/4-12 	1-11/64
1-1/2-12 	1-27/64
1-3/4-12 	1-43/64
2"-12 		1-59/64


METRIC COARSE SIZES


---------------------------- TAP DRILL SIZE SIZE ----------------------------
1mm x .25 .75mm 1.1 x .25 .85 1.2 x .25 .95 1.4 x .3 1.1 1.6 x .35 1.25 1.7 x .35 1.3 1.8 x .35 1.45 2 x .4 1.6 2.2 x .45 1.75 2.5 x .45 2.05 3 x .5 2.5 3.5 x .6 2.9 4 x .7 3.3 4.5 x .75 3.7 5 x .8 4.2 6 x 1 5 7 x 1 6 8 x 1.25 6.8 9 x 1.25 7.8 10 x 1.5 8.5 11 x 1.5 9.5 12 x 1.75 10.2 14 x 2 12 16 x 2 14 18 x 2.5 15.5 20 x 2.5 17.5 22 x 2.5 19.5 24 x 3 21 27 x 3 24 30 x 3.5 26.5 33 x 3.5 29.5 36 x 4 32 39 x 4 35

TAPER PIPE SIZES - NPT

----------------------------
TAP 		DRILL
SIZE 		SIZE
----------------------------
1/8-27 		11/32
1/4-18 		7/16
3/8-18 		37/64
1/2-14 		23/32
3/4-14 		59/64
1"-11-1/2 	1-5/32
1-1/4-11-1/2 	1-1/2
1-1/2-11-1/2 	1-47/64
2"-11-1/2	2-7/32
2-1/2-8 	2-5/8
3"-8 		3-1/4
3-1/2-8 	3-3/4
4"-8 		4-1/4

METRIC FINE SIZES

----------------------------
TAP                 DRILL
SIZE                SIZE
----------------------------
4 mm x .35 3.6mm 4 x .5 3.5 5 x .5 4.5 6 x .5 5.5 6 x .75 5.25 7 x .75 6.25 8 x .5 7.5 8 x .75 7.25 8 x 1 7 9 x 1 8 10 x .75 9.25 10 x 1 9 10 x 1.25 8.8 11 x 1 10 12 x .75 11.25 12 x 1 11 12 x 1.5 10.5 14 x 1 13 14 x 1.25 12.8 14 x 1.5 12.5 16 x 1 15 16 x 1.5 14.5 18 x 1 17 18 x 2 16 20 x 1 19 20 x 1.5 18.5 20 x 2 18 22 x 1 21 22 x 1.5 20.5 22 x 2 20 24 x 1.5 22.5 24 x 2 22 26 x 1.5 24.5 27 x 1.5 25.5 27 x 2 25 28 x 1.5 26.5 30 x 1.5 28.5 30 x 2 28 33 x 2 31 36 x 3 33 39 x 3 36