Decimal Equivalents

Inch	Decimal	Wire	MM	Tap Drill Sizes
	0.0059	97	0.15
	0.0063	96	0.16
	0.0067	95	0.17
	0.0071	94	0.18
	0.0075	93	0.19
	0.0079	92	0.2
	0.0083	91	0.21
	0.0087	90	0.22
	0.0091	89	0.23
	0.0094		0.24
	0.0095	88
	0.0098		0.25
	0.01	87
	0.0102		0.26
	0.0105	86
	0.0106		0.27
	0.011	85	0.28
	0.0114		0.29
	0.0115	84
	0.0118		0.3
	0.012	83
	0.0125	82
	0.0126		0.32
	0.013	81
	0.0134		0.34
	0.0135	80
	0.0138		0.35
	0.0142		0.36
	0.0145	79
	0.015		0.38
1/64	0.0156
	0.0157		0.4
	0.016	78
	0.0165		0.42
	0.0173		0.44
	0.0177		0.45
	0.018	77
	0.02	76
	0.021	75
	0.0225	74
	0.024	73
	0.025	72
	0.0256		0.65
	0.026	71
	0.028	70
	0.0292	69
	0.031	68
1/32	0.0312
	0.032	67
	0.033	66
	0.035	65
	0.0354		0.9
	0.036	64
	0.037	63
	0.0374		0.95
	0.038	62
	0.039	61
	0.04	60
	0.041	59
	0.0413		1.05
	0.042	58
	0.043	57
	0.0433		1.1
	0.0453		1.15
	0.0465	56
3/64	0.0469			#0-80
	0.0472		1.2
	0.0492		1.25
	0.0512		1.3
	0.052	55
	0.0531		1.35
	0.055	54		#1-64
	0.0551		1.4
	0.0571		1.45
	0.0591		1.5
	0.0595	53		#1-72
	0.061		1.55
1/16	0.0625
	0.0635	52
	0.065		1.65
	0.0669		1.7
	0.067	51		#2-56
	0.0689		1.75
	0.07	50		#2-64
	0.0709		1.8
	0.0728		1.85
	0.073	49
	0.0748		1.9
	0.076	48
5/64	0.0781			#3-48
	0.0785	47
	0.0787		2
	0.0807		2.05
	0.081	46		#3-56
	0.082	45
	0.0827		2.1
	0.0846		2.15
	0.086	44		#4-40
	0.089	43
	0.0935	42		#4-48
3/32	0.0938
	0.096	41
	0.0965		2.45
	0.098	40		#5-40
	0.0995	39
	0.1015	38		#5-44
	0.1024		2.6
	0.104	37
	0.1063		2.7
	0.1065	36		#6-32
7/64	0.1094
	0.11	35
	0.1102		2.8
	0.111	34		#6-40
	0.113	33
	0.1142		2.9
	0.116	32
	0.1181		3
	0.12	31
	0.122		3.1
1/8	0.125			5/32-
	0.126		3.2	32NS
	0.128		3.25
	0.1285	30
	0.136	29		#8-32
	0.1378		3.5
	0.1405	28
9/64	0.1406
	0.144	27
	0.1457		3.7
	0.147	26		#10-24
	0.1476		3.75
	0.1495	25
	0.1496		3.8
	0.152	24
	0.1535		3.9
	0.154	23
5/32	0.1562
	0.157	22		#10-32
	0.1575		4
	0.159	21
	0.161	20
	0.1614		4.1
	0.1654		4.2
	0.166	19
	0.1673		4.25
	0.1693		4.3
	0.1695	18
11/64	0.1719
	0.173	17
	0.1732		4.4	#12-24
	0.177	16
	0.1772		4.5	7/32
	0.18	15		-32NS
	0.1811		4.6
	0.182	14
	0.185	13
	0.187		4.75
3/16	0.1875
	0.189		4.8
	0.189	12
	0.191	11
	0.1929		4.9
	0.1935	10
	0.196	9
	0.1969		5
	0.199	8
	0.2008		5.1
	0.201	7
13/64	0.2031
	0.204	6		1/4/20
	0.2047		5.2
	0.2055	5
	0.2067		5.25
	0.2087		5.3
	0.209	4
	0.2126		5.4
	0.213	3
	0.2165		5.5
7/32	0.2188			1/4/28
	0.2205		5.6
	0.221	2
	0.2244		5.7
	0.2264		5.75
	0.228	1
	0.2283		5.8
	0.234	A
15/64	0.2344
	0.2362		6
	0.238	B
	0.2402		6.1
	0.242	C
	0.2441		6.2
	0.246	D
	0.2461		6.25
1/4	0.25	E
	0.252		6.4
	0.2559		6.5
	0.257	F
	0.2598		6.6
	0.261	G		5/16
	0.2638		6.7	-18NC
17/64	0.2656
	0.2657		6.75
	0.266	H
	0.2677		6.8
	0.2717		6.9	5/16
	0.272	I		24NS
	0.2756		7
	0.277	J		5/16
	0.2795		7.1	32NS
	0.281	K
9/32	0.2812
	0.2835		7.2
	0.2854		7.25
	0.2874		7.3
	0.29	L
	0.2913		7.4
	0.295	M
	0.2953		7.5
19/64	0.2969
	0.2992		7.6
	0.302	N
	0.3031		7.7
	0.3051		7.75
	0.3071		7.8
	0.311		7.9	3/8-
5/16	0.3125			16NC
	0.316	O
	0.3189		8.1
	0.3228		8.2
	0.323	P
	0.3248		8.25
	0.3268		8.3
21/64	0.3281
	0.3307		8.4	3/8-
	0.332	Q		24NF
	0.3246		8.5
	0.3386		8.6	1/8-27
	0.339	R		Pipe
	0.3425		8.7
11/32	0.3438
	0.3445		8.75
	0.3465		8.8
	0.348	S
	0.3504		8.9
	0.3543		9
	0.358	T
	0.3583		9.1
23/64	0.3594
	0.3622		9.2
	0.3642		9.25
	0.3661		9.3	7/16-
	0.368	U		14NC
	0.3701		9.4
	0.374		9.5
3/8	0.375
	0.377	V
	0.378		9.6
	0.3819		9.7
	0.3839		9.75
	0.3858		9.8	7/16-2
	0.386	W
	0.3898		9.9
25/64	0.3906
	0.3937		10
	0.397	X
	0.404	Y
13/32	0.4062
	0.413	Z		1/2-13
	0.4134		10.5
27/64	0.4219			1/4-18
	0.4331		11	Pipe
7/16	0.4375			1/2-20
	0.4528		11.5
29/64	0.4531
15/32	0.4688			9/16-
	0.4724		12	12
31/64	0.4844
	0.4921		12.5
1/2	0.5
	0.5118		13
33/64	0.5156			9/16-18
17/32	0.5312			5/8-11
	0.5315		13.5
25/84	0.5469
	0.5512		14
9/16	0.5625			5/8-
	0.5709		14.5	18 NF
37/64	0.5781
	0.5906		15	3/8-18
19/32	0.5938			Pipe
39/64	0.6094
5/8	0.625			11/16-
	0.6299		16	16 NS
41/64	0.6406
	0.6496		16.5
21/32	0.6562			3/4-10
	0.6693		17
43/64	0.6719
11/16	0.6875			3/4-16
	0.689		17.5	16 NS
45/64	0.7031
	0.748		18
23/32	0.7188			1/2-14
	0.7283			Pipe
47/64	0.7344
	0.748		19
3/4	0.75
49/64	0.7656
	0.7677			7/8-9
25/32	0.7812			NC
	0.7874		20
51/64	0.7969
	0.8071		20.5
13/16	0.8125			7/8-14
	0.8268		21	NF
53/64	0.8281
27/32	0.8438
	0.8465		21.5
55/64	0.8594
	0.8661		22
7/8	0.875			1-8NC
	0.8858		22.5
57/64	0.8906
	0.9055		23
29/32	0.9062
59/64	0.9219			3/4-14
	0.9252		23.5	Pipe
15/16	0.9375			1-14
	0.9449		24	NF
61/64	0.9531
	0.9646		24.5
31/32	0.9688
	0.9843
63/64	0.9844			1-1/8-
1	1			7 NC
1-1/64	1.0039		25.5
	1.0156
	1.0236		26
1-1/32	1.0312
	1.0433		26.5
1-3/64	1.0469			1-1/8-
1-1/16	1.0625			12 NF
	1.063		27
1-5/64	1.0781
	1.0827		27.5
1-3/32	1.0938
	1.1024		28
1-7/64	1.1094			1-1/4
	1.122		28.5	7 NC
1-1/8	1.125
1-9/64	1.1406
	1.1417		29
1-5/32	1.1562			1-11
	1.1614		29.5	1/2 Pipe
1-11/64	1.1719			1-1/4
				12 NF

Decimal Equivalents

Tap Drill Sizes

Conversion Chart

Metric Size Drills

Drill Size	Decimal Inches
97	0.0059
.15mm	0.0059
96	0.0063
.16mm	0.0063
95	0.0067
.17mm	0.0067
94	0.0071
.18mm	0.0071
93	0.0075
.19mm	0.0075
92	0.0079
.2mm	0.0079
91	0.0083
.21mm	0.0083
90	0.0087
.22mm	0.0087
89	0.0091
.23mm	0.0091
.24mm	0.0094
88	0.0095
.25mm	0.0098
87	0.0100
.26mm	0.0102
86	0.0105
.27mm	0.0106
85	0.0110
.28mm	0.0110
.29mm	0.0114
84	0.0115
.3mm	0.0118
83	0.0120
82	0.0125
.32mm	0.0126
81	0.0130
.34mm	0.0134
80	0.0135
.35mm	0.0138
.36mm	0.0142
79	0.0145
.38mm	0.0150
1/64	0.0156
.4mm	0.0157
78	0.0160
.42mm	0.0165
.44mm	0.0173
.45mm	0.0177
77	0.0180
.46mm	0.0181
.48mm	0.0189
.5mm	0.0197
76	0.0200
75	0.0210
.55mm	0.0217
74	0.0225
.6mm	0.0236
73	0.0240
72	0.0250
.65mm	0.0256
71	0.0260
.7mm	0.0276
70	0.0280
69	0.0292
.75mm	0.0295
68	0.0310
1/32	0.0312
.8mm	0.0315
67	0.0320
66	0.0330
.85mm	0.0335
65	0.0350
.9mm	0.0354
64	0.0360
63	0.0370
.95mm	0.0374
62	0.0380
61	0.0390
1mm	0.0394
60	0.0400
59	0.0410
1.05mm	0.0413

	UNC (Coarse Thread)		UNF (Fine Thread)
	Pitch (TPI)	Drill size (Inch)	Pitch (TPI)	Drill Size (Inch)
2	4-1/2	1-25/32	12	1-59/64
1-3/4	5	1-35/64	12	1-43/64
1-1/2	6	1-11/32	12	1-27/64
1-3/8	6	1-7/32	12	1-19/64
1-1/4	7	1-7/64	12	1-11/64
1-1/8	7	63/64	12	1-1/32
1	8	7/8	12	15/16
7/8	9	49/64	14	13/16
3/4	10	21/32	16	11/16
5/8	11	17/32	18	37/64
9/16	12	31/64	18	33/64
1/2	13	27/64	20	29/64
7/16	14	0.368 (U)	20	0.386 (W)
3/8	16	5/16	24	0.332 (Q)
5/16	18	0.257 (F)	24	0.272 (I)
1/4	20	0.201 (#7)	28	0.213 (#3)
#12	24	0.173 (#17)	28	0.180 (#15)
#10	24	0.149 (#25)	32	0.159 (#21)
#8	32	0.136 (#29)	36	0.136 (#29)
#6	32	0.106 (#36)	40	0.113 (#33)
#5	40	0.099 (#39)	44	0.104 (#37)
#4	40	0.089 (#43)	48	0.093 (#42)
#3	48	5/64	56	0.081 (#46)
#2	56	0.067 (#51)	64	0.070 (#50)
#1	64	0.059 (#53)	72	0.059 (#53)
#0	-	-	80	3/64

Fraction	Decimal	MM	Letter/Number
	0.0135		80
	0.0145		79
1/64	0.0156	0.396
	0.0160		78
	0.0180		77
	0.0200		76
	0.0210		75
	0.0225		74
	0.0240		73
	0.0250		72
	0.0260		71
	0.0280		70
	0.0292		69
	0.0310		68
1/32	0.0312	0.793
	0.0320		67
	0.0330		66
	0.0350		65
	0.0360		64
	0.0370		63
	0.0380		62
	0.0390		61
	0.0400		60
	0.0410		59
	0.0420		58
	0.0430		57
	0.0465		56
3/64	0.0468	1.190
	0.0520		55
	0.0550		54
	0.0595		53
1/16	0.0625	1.587
	0.0635		52
	0.0670		51
	0.0700		50
	0.0730		49
	0.0760		48
5/64	0.0781	1.984
	0.0785		47
	0.0810		46
	0.0820		45
	0.0860		44
	0.0890		43
	0.0935		42
3/32	0.0937	2.381
	0.0960		41
	0.0980		40
	0.0995		39
	0.1015		38
	0.1040		37
	0.1065		36
7/64	0.1093	2.778
	0.1100		35
	0.1110		34
	0.1130		33
	0.1160		32
	0.1200		31
1/8	0.125	3.175
	0.1285		30
	0.1360		29
	0.1405		28
9/64	0.1406	3.571
	0.1440		27
	0.1470		26
	0.1495		25
	0.1520		24
	0.1540		23
5/32	0.1562	3.968
	0.1570		22
	0.1590		21
	0.1610		20
	0.1660		19
	0.1695		18
11/64	0.1718	4.365
	0.1730		17
	0.1770		16
	0.1800		15
	0.1820		14
	0.1850		13
3/16	0.1875	4.762
	0.1890		12
	0.1910		11
	0.1935		10
	0.1960		9
	0.1990		8
	0.2010		7
13/64	0.2031	5.159
	0.2040		6
	0.2055		5
	0.2090		4
	0.2130		3
7/32	0.2187	5.556
	0.2210		2
	0.2280		1
	0.2340		A
15/64	0.2343	5.953
1/4	0.25	6.350
	0.2380		B
	0.2420		C
	0.2460		D
	0.2500		E
	0.2570		F
	0.2610		G
17/64	0.2656	6.746
	0.2660		H
	0.2720		I
	0.2770		J
	0.2810		K
9/32	0.2812	7.143
	0.2900		L
	0.2950		M
19/64	0.2968	7.540
	0.3020		N
5/16	0.3125	7.937
	0.3160		O
	0.3230		P
21/64	0.3281	8.334
	0.3320		Q
	0.3390		R
11/32	0.3437	8.731
	0.3480		S
	0.3580		T
23/64	0.3593	9.128
	0.3680		U
3/8	0.375	9.525
	0.3770		V
	0.3860		W
25/64	0.3906	9.921
	0.3970		X
	0.4040		Y
13/32	0.4062	10.318
	0.4130		Z
27/64	0.4218	10.715
7/16	0.4375	11.112
29/64	0.4531	11.509
15/32	0.4687	11.906
31/64	0.4843	12.303
1/2	0.500	12.700
33/64	0.5156	13.096
17/32	0.5312	13.493
35/64	0.5468	13.890
9/16	0.5625	14.287
37/64	0.5781	14.684
19/32	0.5937	15.081
39/64	0.6093	15.478
5/8	0.625	15.875
41/64	0.6406	16.271
21/32	0.6562	16.668
43/64	0.6718	17.065
11/16	0.6875	17.462
45/64	0.7031	17.859
23/32	0.7187	18.256
47/64	0.7343	18.653
3/4	0.750	19.050
49/64	0.7656	19.446
25/32	0.7812	19.843
51/64	0.7968	20.240
13/16	0.8125	20.637
53/64	0.8281	21.034
27/32	0.8437	21.431
55/64	0.8593	21.828
7/8	0.875	22.225
57/64	0.8906	22.621
29/32	0.9062	23.018
59/64	0.9218	23.415
15/16	0.9375	23.812
61/64	0.9531	24.209
31/32	0.9687	24.606
63/64	0.9843	25.003
1	1.000	25.400

Drill Size	Decimal Inches	Tap Size
17/32	0.5312	5/8-11
13.5mm	0.5315
35/64	0.5469
14mm	0.5512	m16x2
9/16	0.5625
14.5mm	0.5709	M16x1.5
37/64	0.5781	3/8-18NPT 5/8-18NF
15mm	0.5906
19/32	0.5938	3/8-18NPS
39/64	0.6094
15.5mm	0.6102	M18x2.5
5/8	0.6250	11/16-16NS
16mm	0.6299	M18x20
41/64	0.6406
16.5mm	0.6496
21/32	0.6562	3/4-10NC
17mm	0.6693
43/64	0.6719
11/16	0.6875	3/4-16NF
17.5mm	0.6890	M20x2.5
45/64	0.7031
18mm	0.7087	M20x2.0
23/32	0.7188	1/2-14NPT
18.5mm	0.7283	M20x1.5
47/64	0.7344	1/2-14NPS
19mm	0.7480
3/4	0.7500
49/64	0.7656	7/8-9NC
19.5mm	0.7677	M22x2.5
25/32	0.7812
20mm	0.7874	M22x2.0
51/64	0.7969
20.5mm	0.8071	M22x1.5
13/16	0.8125	7/8-14NF
21mm	0.8268	M24x3
53/64	0.8281
27/32	0.8438
21.5mm	0.8465
55/64	0.8594
22mm	0.8661	M24x2
7/8	0.8750	1-8NC
22.25mm	0.8760
22.5mm	0.8858	M24x1.50
57/64	0.8906
23mm	0.9055
29/32	0.9062
59/64	0.9219	3/4-14NPT
23.5mm	0.9252
15/16	0.9375	3/4-14NPS
24mm	0.9449	>M27x3
61/64	0.9531
24.5mm	0.9646
31/32	0.9688
25mm	0.9843	M27x2
63/64	0.9844	1-1/8-7NC
1	1.00
25.5mm	1.0039
1-1/64	1.0156
26mm	1.0236
1-1/32	1.0312
26.5mm	1.0433	M30x3.5
1-3/64	1.0469	1-1/8-12NF
1-1/16	1.0625
27mm	1.0630
1-5/64	1.0781
27.5mm	1.0827
1-3/32	1.0938
28mm	1.1024	M30x2.0
1-7/64	1.1094	1-1/4-7NC
28.5mm	1.1220
1-1/8	1.1250
1-9/64	1.1406
29mm	1.1417
1-5/32	1.1562	1-11-1/2NPT
29.5mm	1.1614
1-11/64	1.1719	1-1/4-12NF

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